Applied Laser Spark Spectroscopy: The Evolution of LIBS into Real- - - PowerPoint PPT Presentation
Applied Laser Spark Spectroscopy: The Evolution of LIBS into Real- - - PowerPoint PPT Presentation
Applied Laser Spark Spectroscopy: The Evolution of LIBS into Real- World Applications Presented by: APPLIE D Technical Group Leadership SPE CTROSCOPY TE CHNICAL GROUP Chair: Elina A. Vitol, Staff Scientist, ECOLAB Advisor: Samuel
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Welcome to today’s webinar!
- Dr. Andrzej M iziolek, U.S. Army Research Laboratory (retired)
“Applied Laser Spark Spectroscopy: The Evolution of LIBS into Real-World Applications”
M ay 17, 2016 ▪10 am EDT
APPLIE D SPE CTROSCOPY TE CHNICAL GROUP
Applied Laser Spark Spectroscopy: The Evolution of Laser-Induced Breakdown Spectroscopy (LIBS) into Real-World Applications
Andrzej W. M iziolek, Ph.D. amiziolek@aol.com OSA Webinar, 17 M ay 2016
Outline
- Background
- Introduction to LIBS
- Overview of Recent Applications
- Highlights of Sample Applications (M ars, nuclear,
forensics, food, plants, drink, biomedical, coal, wear metals)
- Example of handheld LIBS
- Nanoparticle-enhanced LIBS
- LIBS in Education
- Conclusions
Background
- LIBS has undergone rapid development since the
early 1980s and is now generally considered to be a major established technique in chemical analysis.
- Speed (real-time analysis)
- Inherently rugged and easy to use (usually no sample
preparation required)
- M assive amount of information (total elemental inventory
- f sample)
- LIBS commercial systems are becoming smaller and cheaper,
and suitable for field use
- Same device can analyze a very wide range of materials
- Particularly suitable for forensics and provenance (due to
elemental fingerprinting)
- Can analyze materials- close-contact, standoff, underwater,
stand-alone or on robots
Why LIBS?
Introduction to LIBS
Nd:Y AG laser (1064 nm, 8 ns) spectrometer Laser-Induced Breakdown Spectroscopy
Introduction to LIBS
- sample is simultaneously ablated and excited by a pulsed laser
beam with sufficient energy to atomize/ ionize/ excite the target material => exceed the breakdown threshold
- the flash of light is collected by optics into a spectrometer which
separates the wavelengths and detects the light energy
- the elemental inventory of the sample is determined in real-time
Nd:Y AG laser (1064 nm, 8 ns) spectrometer Laser-Induced Breakdown Spectroscopy
Introduction to LIBS
- sample is simultaneously ablated and excited by a pulsed laser
beam with sufficient energy to atomize/ ionize/ excite the target material => exceed the breakdown threshold
- the flash of light is collected by optics into a spectrometer which
separates the wavelengths and detects the light energy
- the elemental inventory of the sample is determined in real-time
Nd:Y AG laser (1064 nm, 8 ns) spectrometer Laser-Induced Breakdown Spectroscopy
M ultiple Books About LIBS
LIBS 2000- Tirrenia, Italy LIBS 2002- Orlando, USA LIBS 2004- Torremolinos, Spain LIBS 2006- M ontreal, Canada LIBS 2008- Berlin, Germany LIBS 2010- M emphis, USA LIBS 2012- Luxor, Egypt LIBS 2014- Beijing, China LIBS 2016- Chamonix, France LIBS 2018- ?, USA
LIBS is International
M ajor International Conferences*
* “I enjoy the LIBS community more than all others, it ’s a great family, so to speak.” … from a prominent LIBS scientist in academia…
Sample Papers of Real-World Applications Presented at the LIBS 2014 Conference in Beijing, China
- Silver J
ewelry M icroanalysis using LIBS
- Quantification of Rare Earth Elements Using LIBS
- Garnet Classification and Provenance Using LIBS
- Investigation of LIBS for Potential Ocean Applications
- LIBS for the Detection of Toxic Elements in Saudi Arabia Water Samples
- Epidemiological Application of LIBS: Analysis of Fingernails for Screening of Diseases
- A M ethod of Quickly Detecting Heavy M etals in Vegetables Using LIBS
- Nondestructive Determination of Cu Residue in Orange Peels
- Application of LIBS in Early Detection of Red Palm Weevil Infestation in Date Palm
- LIBS for Elemental Imaging of Biological Tissues
- M icro-LIBS Analysis of Shells: A Potential Way to Track the M arine Ecosystem
- LIBS System for Total Carbon and M icronutrients Determination in Soils
- Quantitative Analysis M ethod for Heavy M etals in Soils Determined by LIBS
- Spectrochemical Analysis of Asian Works of Art
- LIBS Applied to Historical Bronze Samples
- A Compact Prototype of LIBS-Raman Spectroscopy for M ars Exploration
- Quantitative Analysis of Pb in Water by LIBS
- Discrimination Between Different Egyptian Crude Oil Grades Using LIBS
- Comparative Study of Human and Horse Hair Using LIBS for M ineral Content
- Analysis of Trace Elements in Turnip Using LIBS
- Using LIBS to Follow Up Abundance of Heavy M etals Absorbed in Fish Bone
- Investigation of LIBS for Laser Surgery Feedback Control M echanism
- Provenance Determination of Cumin Spice Using LIBS
- Evaluation of LIBS for Determination of Ca and M g in Beef Samples
LIBS Analysis of Rocks and Soils on M ars- A M ajor Success Story
Launched November 2011- arrived August 2012 (http:/ / www.msl-chemcam.com/ )
* Collaboration between NASA and CNES (French space agency)
ChemCam
Mast Unit (contains LIBS)
Standoff Range: 1.5-7 meters M ars Science Laboratory Rover “Curiosity”
LIBS Applications in the Nuclear Industry
- In the UK, LIBS has been used to remotely analyse materials within high-
radiation areas at the Sellafield nuclear plant and also at various nuclear power stations.
- LIBS has been shown to be able to provide useful information on the elemental
makeup of highly radioactive material.
- In some cases physical sampling is not feasible and so LIBS offers unique
capabilities in this area.
- In addition to analysing radioactive materials, LIBS has been used to analyse
components of various nuclear plant and equipment where physical access is severely restricted (eg. steam tubes and other components inside a steam generator at a nuclear power station).
LIBS Applications in the Nuclear Industry cont ’d
- APL is currently working with the UK Nuclear Decommissioning Authority and
the operators of Sellafield to use APL ’s proprietary submersible LIBS probe to characterise radioactive waste submerged in water and sludge at several storage ponds which date back to the 1950s.
- M uch of the waste which was disposed of in these ponds has not been moved
for 50 years and so is in a highly corroded state. Very few records were maintained on the inventory of this waste and so it must be characterised before it can be removed from the ponds and processed for long-term storage
- r disposal.
- The submersible LIBS probe is unique in its ability to identify various items of
waste via its elemental signature, for example being able to identify fragment
- f irradiated uranium fuel mixed up with other debris such as scrap metal
tubes, pieces of concrete, pieces of graphite, M agnox fuel cladding, etc.
Applied Geochemistry, 2009 Analytical and Bioanalytical Chemistry, 2011 Chemical and Engineering News, 2012
LIBS for Ascertaining Provenance by Elemental Fingerprinting
LIBS is an Emerging New Tool for Forensic Analyses
- The ability of LIBS to do quantitative measurements is well-established.
- Prof. Almirall’s group at FIU and researchers at other universities, e.g. Prof.
Richard Hark at Juniata and Prof. M atthieu Baudelet at UCF , have been advancing the application of LIBS to forensics
- glass, paint, soil, fibers, paper and ink, counterfeit currency, gunshot
residue (GSR), biomaterials/ fingerprint, and nuclear forensics analyses.
- LIBS has already been successfully used in a court case involving an
attempted bank robbery.
- FIU group has published 20 papers in recent years. M ultiple papers from
- ther groups as well.
- M ultiple forensics labs are purchasing LIBS systems.
- Book Chapter-
Some Examples of LIBS Publications Concerning Foods
- “LIBS: A Quality Control T
- ol for Food Supplements”, Rahul Agrawal, Rohit Kumar, Shikha Rai, Ashok Kumar
Pathak, Awadhesh Kumar Rai, and Gyanendra Kumar Rai, Food Biophysics (2011) 6:527–533.
- “Evaluation of minor element concentrations in potatoes using laser-induced breakdown spectroscopy”,
- S. Beldjilali , D. Borivent, L. M ercadier, E. M othe, G. Clair, and J. Hermann, Spectrochimica Acta Part B 65
(2010) 727–733.
- “Determination of Ca in breakfast cereals by laser induced breakdown spectroscopy”, Ferreira, E.C.,
M enezes, E.A., M atos, W.O., M ilori, D.M .B.P ., Nogueira, A.R.A., and M artin-Neto, L.: Food Control, 2010, 21, pp. 1327–1330.
- “A matrix effect and accuracy evaluation for the determination of elements in milk powder LIBS and laser
ablation/ ICP-OES spectrometry”, N. Gilon, J. El-Haddad, A. Stankova,W. Lei, Q. M a, V. M otto-Ros, and J. Y u, Anal Bioanal Chem (2011) 401:2681–2689.
- “Development of a LIBS assay for the detection of Salmonella enterica serovar Typhimurium from food”,
Cleon Barnett, Courtneé Bell, Komal Vig, A. C. Akpovo, Lewis Johnson, Shreekumar Pillai, and Shree Singh, Anal Bioanal Chem (2011) 400:3323–3330.
- “Estimation of Wheat Grain Tissue Cohesion via Laser Induced Breakdown Spectroscopy”, M ilena R.
M artelli, François Brygo, Philippe Delaporte, Xavier Rouau, and Cécile Barron, Food Biophysics (2011) 6:433–439.
- “LIBS-Based Detection of Antioxidant Elements in Seeds of Emblica officinalis”, Shikha M ehta, Prashant
Kumar Rai, Devendra Kumar Rai, Nilesh Kumar Rai, A. K. Rai, Dane Bicanic, Bechan Sharma and Geeta Watal, Food Biophysics, published online: 20 April 2010.
LIBS Analysis of Cu and Co in Fish Bones*
- Fishbones were used as a natural and low cost heavy metal
sorbent (mainly Cu and Co) from synthetic wastewater.
- Calibration curves were constructed based on X-ray fluorescence
(XRF) analysis technique
- The results were validated by comparing LIBS data with those
- btained by XRF spectrometry.
- The results of the two techniques are strongly correlated which
verified the feasibility of using LIBS to detect traces of heavy metals adsorbed from wastewater by fish bones.
- This study reflects the potential of using LIBS in environmental
applications. * Citations directly from the Abstract and Conclusion
- The presence of bone particles, and hence the calcium content, is a key quality parameter for
mechanically separated poultry meat (M SM ).
- A method for fast at-line monitoring of the calcium content in M SM during production is therefore
requested by the industry.
- Laser-induced breakdown spectroscopy (LIBS) is an interesting technique in this regard because it is
fast and potentially enables direct detection of minerals in a sample with minimal sample preparation.
- Nine commercial M SM samples, representing the common range of calcium contents in M SM were
measured by LIBS using sample preparation suitable for an industrial at-line monitoring setting.
- Very low (<20 mg/ 100 g Ca), intermediate (20-90 mg/ 100 g Ca), and high (>90 mg/ 100 g Ca) levels
were determined.
- The work presented here demonstrates that LIBS may have the potential to be applied as an at-
line method for measurement of fresh M SM samples in a production setting.
LIBS Analysis of Ca in Poultry M eat
- The development of a multivariate model for fiber content prediction in sugar cane has been
investigated and can be offered as an alternative to the wet methods of analysis.
- The importance of fiber in bagasse of sugar cane is directly linked to the production of sugar and
alcohol performances and to payment systems.
- The analytical method investigated here was the Laser-Induced Breakdown Spectroscopy (LIBS)
combined with a Partial Least Squares (PLS) chemometric tool that can achieve the best model to predict fiber content in sugar cane.
- A total of 6287 spectra of raw samples of sugar cane bagasse were evaluated.
- The noteworthy of this study was the development of an analytical method of direct analysis to
predict fiber content in raw sugar cane bagasse, in the presence of impurities and moisture, without pre-treatment of samples and as close as possible to the nature of the samples.
LIBS Analysis of Fiber in Sugar Cane
LIBS for Food Provenance
- There is a need in many industries and government functions to identify the source of origin
for various materials.
- For example, the food industry needs to ensure that the claimed source of some of the food
products (e.g. coffee, spices) are in fact legitimate due to the variation of quality from different source locations world-wide. Another example is to identify the source country for imported commodities going through Customs so as to assess the correct tariff which varies depending on the source country.
- Laser Induced Breakdown Spectroscopy (LIBS) holds promise for being a field-portable tool
for rapid identification of the country of origin of various materials.
- Our initial study on the spice cumin has demonstrated that discriminant function models
can not only be created with 100% separation between the 4 countries of origin (China, India, Syria, and Turkey), but also when tested they show 100% correct matching to the country of origin.
- This study adds to the growing number of publications that indicate the power of LIBS
elemental fingerprinting for provenance determinations.
LIBS on Cumin- Full Spectrum
“Spectroscopy M ethods for Identifying the Country of Origin”, Ellen Hondrogiannis, Erin Ehrlinger, and Andrzej W. M iziolek, Next-Generation Spectroscopic Technologies VI, edited by M ark A. Druy, Richard A. Crocombe, Proc. of SPIE Vol. 8726, 87260Q.
Expanded Regions of Cumin LIBS
Spectrum
M g, Si Ca, Al Sr, Ca, M n Sr, Al, Fe
Discriminant Function Analysis Test Results
Discriminant Functions Plot by Origin Df1 (72.33%) Origin China Syria Turkey India Df2 (19.20%)
- 4.5
- 2.5
- 0.5
1.5 3.5
- 2
- 1
1 2 3 4
Centroid
The model correctly predicted the geographic origin of all test samples 100.0% during validation testing. Data captured by the benchtop LIBSCAN 100 system The intensities from the lines due to Al, Ba, Ca, Cr, Fe, M g and Sr were ratioed to K and entered into the discriminant analysis.
Problems with Olive Oil
http:/ / www.oliveoiltimes.com/ tag/ olive-oil-adulteration
“Some reports… have shown that 80 percent of olive oil in grocery stores is either mislabeled — making the claim that it's extra virgin when it isn't — or what he called "counterfeit," mixed with seed
- il.”
lorraine.mirabella@baltsun.com, M ay 10, 1016, http:/ / www.baltimoresun.com/ business/ bs-bz-olive-oil-fda-testing-20160509-story.html
LIBS Analysis of Olive Oil
- (LIBS) and neural networks (NNs) has been developed and applied to the
identification, quality control, traceability, and adulteration detection of extra virgin olive oils.
- Using a single laser pulse and treatment by NNs.
- The results obtained allow the identification of the oils tested with a
certainty of more than 95%.
- Single-shot measurements were enough for clear identification of the
samples.
- The method can be developed for automatic real-time, fast, reliable, and
robust measurements, and the system can be packed into portable form for non-specialist users.
LIBS Analysis of Olive Oil cont’d- Samples
LIBS Analysis of Olive Oil cont’d- Results
LIBS for Quality Determination of Brazilian Coffee
- The commercial demand and the economic value of roasted and ground coffee
(RGC) are intrinsically related to its quality.
- Brazilian RGC has been certified for quality based on a score assigned by expert
tasters.
- However, intrinsic costs and the lack of fast techniques make largescale analysis
prohibitive.
- Laser induced breakdown spectroscopy (LIBS) is a promising technique for RGCs,
however it demands an accurate coupled-model for pattern recognition.
- Results show accuracies above 84% for ensemble methods in some spectral
- ranges. The best performances were in the range 670–690 nm, making viable the
design of dedicated equipment with low-cost devices.
LIBS for M etal Determination of Plant Leaves
- We report on the development and implementation of analytical
methodology for investigating elemental accumulation in different layers within plant leaves, with in-situ spatial resolution mapping, exploiting the technique of LIBS.
- The spectrochemical analysis of lead-doped leaf samples is demonstrated
to develop a real time identification procedure in order to complement
- ther analytical techniques not lending themselves for spatial resolution
analysis.
- Our findings suggest that with elevated levels of Pb within the plants,
transportation and storage of some nutrition elements is changed.
LIBS for Tobacco Provenance
- Tobacco is an agricultural product originating in America that is obtained by
processing the leaves of various plants of the genus Nicotiana tabacum.
- It is the inedible product occupying the most plantings in the world, according to
a recent report from the United Nations Food and Agriculture Organization
- A particular segment of the tobacco industry is the manufacturing of handmade
cigars, which for some third-world countries is an important source of income.
- There are different qualities of cigars, and a major problem is the adulteration
that occurs, for example, when authentic high-quality leaves are replaced by lower quality leaves.
- We present a simple and quick technique for the quality control and origin
identification of handmade cigars that measures the M g/ Ca ratios in the tobacco leaves and wrappers of the cigars using laser-induced breakdown spectroscopy.
LIBS for Cannabis Analysis
- Laser-induced breakdown spectroscopy (LIBS) is an emerging atomic emission
based solid sampling technique that has many potential forensic applications.
- In this study, the analytical performance of LIBS, as well as that of inductively
coupled plasma mass spectrometry (ICP-M S), laser ablation inductively coupled plasma mass spectrometry (LA-ICP-M S) and X-ray microfluorescence (mXRF), was evaluated for the ability to conduct elemental analyses on Cannabis plant material, with a specific investigation of the possible links between hydroponic nutrients and elemental profiles from associated plant material.
- Good correlation among the four techniques was observed when the
concentrations or peak areas of the elements of interest were monitored.
- For Cannabis samples collected at the same growth time, the elemental profiles
could be related to the use of particular commercial nutrients.
- In addition, the study demonstrated that ICP-M S, LA-ICP-M S and LIBS are suitable
techniques for the comparison of Cannabis samples from different sources, with high discriminating powers being achieved.
Determination of M etal Elements in Wines using LIBS*
Jana Bockováa,d, Y e Tiana,b, Hualiang Yina, Nicole Delepine-Gilonc, Qianli M ae, Y anping Chene, Pavel Veisd and Jin Y ua,e,
aInstitut Lumière M atière, Université Lyon 1-CNRS, Université de Lyon, France bOptics and Optoelectronics Laboratory, Ocean University of China, 266100, Qingdao, R. P
. China
cInstitut des Sciences Analytiques, Université Lyon 1-CNRS, Université de Lyon,France dDepartment of Experimental Physics, Comenius University in Bratislava, M lynská dolina, 842 48, Bratislava, Slovakia eKey Laboratory for Laser Plasmas, Department of Physics and Astronomy, Shanghai Jiao T
- ng University, China
* Work in progress
LIBS Analysis of Wine cont’d
“Our results with wine are already quite significant with a LoD of 100 ppb for Ti and ~ 20 elements detected in commercial available wines, which opens many perspectives in wine analysis:
- pollution/ impurity detection,
- quality assessment,
- classification according to the
production region,
- authenticity assessment.”
Biomedical Applications of LIBS
Adapted from:
CHAPTER 17. BIOM EDICAL APPLICATIONS OF LIBS
Steven J. Rehse, Ph.D. University of Windsor rehse@uwindsor.ca
Calcified Tissues
- Bones
- Dental
- Stones and calculi
- Fingernails
Soft Tissues
- Organs
- Cancers/ malignancies
- Hair and skin
M edical Specimens
- Blood
- Proteins
Bacteria/ Pathogens
- M edical Specimens
- M ulti-drug resistant strains
- M olds/ spores
Laser guided surgery
- Bone vs. Soft Tissue
Approach 1 Approach 2
Two Approaches Commonly Used
Sampling locations
Concentration
- f Sr
5 9
A
- - Healthy tissue
- - Caries tissue
C
Ratio of Mg/Ca
Sampling locations
1 2 4 5 3
B
Calcium-normalized strontium LIBS intensity (false color grayscale) A rb itra ry in ten sity u n its
D
Calcified Tissues
- Bones
- Dental
- Stones and calculi
- Fingernails
Soft Tissues
- Organs
- Cancers/ malignancies
- Hair and skin
- O. Samek et al., Spectrochim. Acta B 56, 865 (2001)
V.K. Singh and A.K. Rai, Lasers Med. Sci. 26, 307 (2011) F.C. Alvira et al., Appl. Spectrosc. 64, 313 (2010)
N o r m a lize d LIB S In t e n sity (A .U .)A breast cancer
N o r m a lize d LIB S In t e n sit y (A .U .)B colorectal cancer
Breast Cancer GradeC calcium emission D
Breast Cancer Grademagnesium emission E
Colorectal Cancer Gradecalcium emission F
Colorectal Cancer Grademagnesium emission
- A. El-Hussein et al., Talanta 82,
495 (2010)
Tooth 1D and 2D M apping
Au Nanoparticles in Rat Kidney (20 micron res.)
M alignant vs. Healthy Tissue
http:/ / www.spectroscopyonline .com/ biological-mapping-libs
- Prof. Vincent M otto-
Ros, Lyon 1 University
Journal of M edical Eng & Tech, 2012, 36(2): 77-89
Bacteria/ Pathogens
- M edical Specimens
- M ulti-drug resistant strains
- M olds/ spores
(a)
Escherichia Enterobacter Staphylococcus Streptococcus Mycobacterium
(b)
- E. coli 25922
- E. coli O157:H7
- E. coli C
- E. coli HF
- E. coli K12
- E. cloacae 13047
- S. saprophyticus
- S. aureus
- S. mutans
- S. viridans
- M. smegmatis WT
- M. smegmatis TE
- M. smegmatis TA
Q.I. Mohaidat et al., Appl. Opt. 51, B99 (2012)
Bacterial Strain Differentiation
R.A. Putnam et al., Spectrochim. Acta B 87, 161-167 (2013).
Laser guided surgery
- Bone vs. Soft Tissue
D.C. Jeong et al., Curr. Opin. Neurobiol. 22, 24 (2012) B.-M. Kim et al., Appl. Surface Sci. 127– 129, 857 (1998)
LIBS-Feedback-Guided Laser Surgery
LIBS for Industrial Coal Analysis
Background and Challenges
Background
Billion dollars market for online/fast coal proximate and ultimate analysis in
China for pricing, coal blending, and combustion optimization
Traditional chemical processing method takes 14~24 hours
Thirstily require online/fast coal property analyzer LIBS: a promising technology
Challenges
Precision
Reproducibility: Very little work has been done to improved measurement-to-measurement reproducibility
Normally much higher than national standard for coal analyze (RSD less than 1%) Accuracy
Affected by ash content, moisture content, and volatile content greatly
Increasing pulse number does not effectively decrease sample-to-sample RSD to satisfactory levels
Univariate model: Worse calibration results, better reproducibility Multi-variate model: Better calibration results, worse reproducibility
Current Model does not work for coal analysis
Method and Results
Lifetime cooperation between TSI and Tsinghua University
Methods
Using standardization method to reduce the RSD of each spectral line
Using dominant factor based PLS method to improve measurement accuracy
Using self-adoptive spectra database and spectrum identification technology to greatly improve reproducibility and accuracy
Special consideration for coal analysis
Rely more on major coal elements such as C, H, O, N
Classification before prediction
Results
Meet the national standard using chemical processing method using LIBS and prove the feasibility of LIBS for quantitative coal analysis
Develop a method that enable precise and accurate measurement for
- ther samples using LIBS
Method Flow-chart
PLS model Proposed model National standard Error of C measurement 4.9% 0.42% <1% Error of H measurement 0.30% 0.05% <0.25% Error of ash measurement 1.1 %( ash<15%) 1.8 %( 15 %< ash<30%) 1.9 %( ash>30%) 0.07 % (ash<15%) 0.17% (15 %< ash<30%) 0.23% (ash>30%) <0.3% (ash<15%) <0.5% (15 %< ash<30%) <0.7% ( ash>30%) Error of volatile measurement 0.93 %( volatile <20%) 1.69 %( 20 %< volatile <40%) (No sample for volatile >40%) 0.03 %( volatile <20%) 0.11 %( 20 %< volatile <40%) (No sample for volatile >40%) <0.5% ( volatile <20%) <1% (20%<volatile <40%) <1.5% (volatile >40%) Error of heat value measurement 1.1 MJ/kg 0.07 MJ/kg <0.3 MJ/kg
Results list Carbon Measurement Heat value Measurement
LIBS Analysis of Wear M etals in Lubricants from Engines and Transmissions
- The performance of laser-induced breakdown spectroscopy for quantitative analysis of
wear metals in oils has been evaluated in this work with a specific ablation configuration
- f a thin layer of oil covering the polished surface of a pure aluminum target.
- A set of reference samples containing 12 metallic elements (Ag, Al, Cr, Cu, Fe,M g, Na,
Ni, Pb, Si, Sn, and Ti) was prepared.
- Calibration curves were therefore established for these elements.
- The obtained results show first high linearity of the calibration curves…
the determination coefficient, R2, of all the calibration curves are superior to 0.99.
- The limits of detection (LoDs) with an echelle spectrometer vary in the range from
- 0.29 to about 10 μg/ g with an average value of 6.02 μg/ g for the 9 elements (Al, Na and
Pb excluded)… (M g, Cu and Ag) are determined lower than μg/ g, i.e. in the sub-ppm level.
- Comparison with the previously published data shows moreover the efficiency of the
introduced ablation configuration as one of the most suitable methods for highly sensitive and precise wear metal analysis in oils.
LIBS Analysis of Wear M etals in Lubricants from Engines and Transmissions, cont’d
- Alloy identification of oil-borne wear debris captured on chip detectors, filters and
magnetic plugs allows the machinery maintainer to assess the health of the engine or gearbox and identify specific component damage.
- Today, such identification can be achieved in real time using portable, at-line laser-
induced breakdown spectroscopy (LIBS) and Xray fluorescence (XRF) instruments. Both techniques can be utilized in various industries including aviation, marine, railways, heavy diesel and other industrial machinery.
- In this work, the performances of a LIBS and an XRF instrument are compared based on
measurements of a wide range of typical aerospace alloys including steels, titanium, aluminum and nickel alloys.
- Portable LIBS demonstrates higher detection accuracy and better identification of
alloys comprising lighter elements as compared to that of the portable XRF system, and reveals a significant reduction in the analysis time over XRF.
Fieldable & Installed Fluidic LIBS Market Needs
5 1
Large Scale Deployable/Mobile Systems - Least sensitive to system size, cost, & power
– Facilities; Installed large system infrastructure, water and sewer treatment – Power Production Industry; Windmills, Turbine Engines, Transmissions, Generators – Transportation; Ocean Going Vessels, Cargo Shipping, Military, Cruise Ships – Manufacturing process fluids and effluent stream monitoring
Intermediate Scale Fieldable/Installed Platform Systems - Reducing size, weight & cost
– Transportation Industry - Commercial Long Haul; Trucking, Locomotives, Planes – Construction Equipment; Bulldozers, Quarry equipment, Mining and Tunneling – Scientific studies and long-term monitoring (e.g. waterways, streams and effluent)
Small Scale Integrated Analysis Systems Market - More sensitive to system size & cost
– Planes, Trains, and Automobiles (e.g. oil, cooling steering, and transmission fluids) – Medial monitoring and diagnostics (e.g. cell, bacterial, and wound monitoring)
Commercial Scale Transparent Monitoring Systems - Large quantities, small & cheap
– Home and commercial appliances (e.g. HVAC and refrigeration systems) – Ubiquitous installed monitoring applications
Ron Pivarnik, Director of Programs, Ron@sbmicrosystems.us
Shrinking LIBS Systems; A Roadmap
5 2
Large Scale Deployable/Mobile Systems (1-5 Years)
– Reasonable, not overly sensitive to, size or constrained requirements – Ruggedized Deployable analysis system for very expensive equipment – Installed base of systems in the hundreds of units – Level of detection (LOD) – parts per million (PPM)
Intermediate Scale Fieldable Systems (5-15 Year)
– Installable system platform, size and cost reduction – Size reduction due to custom component integrations – Installed base growing into the hundreds of thousands – Level of detection (LOD) – parts per billion (PPB)
Small Scale Integrated Analysis Systems (15+ Years)
– Size, weight, power, and cost constraints are important – Transparently installation base in the millions units annually – Integrated with other commercial and home analytics system sensors – Level of detection (LOD) – parts per trillion (PPT)
“LIBS Everywhere”
Installation of small, cost effective in-situ fluidic analysis system in high value machinery. Data becomes the product, not the system itself. Enablers
Small size : Unobtrusive installation
Requires new thinking in source and detection components
Lower duty cycle, rugged environment
Unattended monitoring, seamless integration
Low cost relative to monitored equipment/system
Cost reduces as monitoring is pushed closer to consumer & volume increases
Industrial machinery (Power generator transmissions, manufacturing equipment, cargo vessels)
Consumer machinery (Automotive [~15M units/annum], household appliances)
Heavy machinery (Trucks, ships, trains, planes)
Product qualification & safety (HALT, HASS)
Drilling platforms (Oil, water)
In-situ, flowing liquid : No sample preparation
On-the-fly monitoring of machine health
Reduces the downtime of machinery
Measured in $M/hr
Environmentally conscious
Reduces consumption of lubricants, coolants, other hazards 5 3
Commercial Applications for Handheld LIBS- One Example
Two models: Z-200: Spectral range 190 – 615 nm Z-300: Spectral range 190 – 950 nm Extended range of Z-300 adds lines for 10 additional elements: H, O, N, Cl, Br, F , Rb, K, Ce, S
- 6 mJ/ pulse, 50 Hz laser,
- Integrated argon purge for 10x+ signal increase,
- Gated spectrometers,
- Rastered laser,
- Weight about 4 lbs.
There are 7 companies that are selling handheld (HH) LIBS systems
Environmental: Beryllium in Soil, other M aterials
- The only handheld technology
capable of measuring elemental beryllium,
- M easurements in soil, materials
for weapons lab clean-up,
- Be content in aluminum and
copper alloys for safety and/ or alloy verification,
- Typical Be limits of detection <
10 ppm.
Alloy Analysis
56
- The Z’s now in widespread use for
alloy verification and scrap sorting,
- Used by Kaiser, Alcoa and other
major metal producers for quantitative alloy chemistry and grade verification. (key elements Li, Be, M g, Si, Cr, Cu, Zn, Zr).
- Low Cr content in carbon steels
for flow-accelerated corrosion (power plants),
- M etal recyclers for fast sorting of
scrap.
M ining/ M ineral Exploration
- LIBS is the only HH
technology that can measure several critical elements and base metals: Li, Be, B, Na, M g, Al,
- Also measures
transition/ heavy metals,
- HH XRF is
complementary technology,
- In some cases scatter is
due to sampling effects not LIBS precision/ bias.
- Extended spectrometer
- ut to 950 nm to
measure S lines in 920- 930 nm.
The effect of the coupling between the laser electromagnetic field and the surface plasmons of the NPs deposited
- n the target can be summarized in the following points:
1) Production of seed electrons by electron emission field (tunneling) instead of multiphoton ionization and consequent generation of multipoint plasma ignition (i.e. more efficient ablation) 2) More efficient electron excitation 3) Increasing of the emitters concentration inside the confining SW wall 4) Increasing of the emission lines up to 2 orders of magnitude
Nanoparticle-Enhanced LIBS (NELIBS)
Microdrop of metal NPs solution (0.5 µl, 0.02 mg/ml, surface concentration 32 ng cm-2) Laser @1064 nm Laser @1064 nm
Signal enhancement about 200 times in conductive samples
Analytical performance
50 100 150 200 50 100 150 200 250 300
Intensity Pb I405.78 nm (a.u.) PbCl2 Pb concentration (ppb)
NELIBS LIBS y = 1.54*x + 5.87, R
2 = 0.992
y = 0.28*x + 42.46, R
2 = 0.999
Comparison between NELIBS and LIBS Li signal in a solution of the protein Reaction Center (RC) from the purple bacterium Rhodobacter sphaeroides at concentration 10-5 M. Comparison between NELIBS and LIBS Mn I calibration curves in bronze alloys Comparison between NELIBS and LIBS Pb I calibration curves in PbCl2 water solution
Recent results: 1) Application to biological samples (enhancement of the signal up to 1-2 order of magnitude) Detection of metals in proteins and tagged proteins (collaboration with DSU). 2) LOD below hundreds of parts-per-trillion (ppt) for metallic cations in 1 µl of liquid solution. 3) Non destructive analysis of transparent sample. 4) Enhancement of the molecular emission up to 1 order of magnitude (collaboration with LBNL). Work in progress: 1) Applying NELIBS to animal tissue (collaboration with University of Lyon) 2) Push the spatial resolution of LIBS to nm scale exploiting the different ablation threshold
- f the surface with and without NPs
LIBS as an Excellent Tool for Pedagogical Purposes: Attributes include- Speed, No sample preparation, Elemental Inventory down to ppm range
- Optics
- Plasmas
- M aterials Science
- Lasers
- Spectroscopy
- Chemometrics
- Analytical Chemistry
- Forensics
- Biology
- Environmental
Some Scientific Disciplines that Can be Taught Using the LIBS technique
Chapter Content for the LIBS Section 7.7 Laser-Induced Breakdown Spectroscopy 7.7.1 Principle of Operation 7.7.2 Instrumentation 7.7.3 Applications of LIBS 7.7.3.1 Qualitative Analysis 7.7.3.2 Quantitative Analysis 7.7.3.3 Remote Analysis 7.7.4 Commercial LIBS S ystems
LIBS is Now Included in Undergraduate Textbook
7th Edition contains new topics-
- Ion mobility spectrometry
- Time domain NM R
- Electron spin resonance spectroscopy (ESR, EPR)
- Forensic science and bioanalytical applications
- M icrocalorimetry and optical thermal instruments
- Laser-induced breakdown spectroscopy (LIBS)
Examples of LIBS Instruments for Field Applications
Example of a handheld LIBS unit, 5-7 mJ/ pulse, battery-operated. There are currently 7 companies selling handheld LIBS systems. Example of Person- Portable LIBS unit, 45-50 mJ/ pulse, battery operated Example of Trans- Portable LIBS unit, 150 mJ/ pulse A number of LIBS M anufacturers make benchtop systems. Generally, the greater the laser pulse energy up to 100-150 mJ/ pulse, the better the performance in “elemental fingerprinting/ provenance”
Conclusions
- LIBS is starting to impact on all aspects of human life,
including food, biomedical, energy resources, environmental concerns, hazards analysis, industrial processes, as well as power, machinery, and transportation.
- LIBS has shown the capability to work in extremely
hostile environments.
- LIBS is an important new tool for forensics, and for the
determination of the origin (country, manufacturing facility, specific mine, specific growing region) of various materials, including food products.
- Progress in the understanding of the science which is
underpinning the LIBS technology, as well as improvements in the actual LIBS devices and components, continue unabated with international participation.
- A variety of commercial benchtop LIBS devices are already
- available. Rugged LIBS systems, including handheld, man-
portable, and transportable have recently become available and can be tested and used in the field. This includes future use for ports of entry, Customs, shipping, rail, and air facilities.
- The use of the LIBS technology for rapid analysis of various
food and drink products for authenticity, quality, adulteration, and contamination has been demonstrated.
- The future of LIBS is bright, including the use of LIBS for
teaching a wide variety of scientific areas.
- Within the next few years, as fieldable LIBS devices are