Development of a Rapid Method for Po, Th, and U Analysis in Hydraulic - - PowerPoint PPT Presentation

Development of a Rapid Method for Po, Th, and U Analysis in Hydraulic Fracturing Flowback Water

Andrew Nelson, MS Interdisciplinary Human Toxicology (Schultz Group) University of Iowa, Iowa City

Chemical Matrix

Specie Concentration (mg/L) Chloride (Cl) 146667 Strontium (Sr) 36333 Sodium (Na) 29333 Calcium (Ca) 13000 Barium (Ba) 9000 Magnesium (Mg) 853 Potassium (K) 163 Manganese (Mn) 3 Iron (Fe) 43 Lead (Pb) 1 Total Solids (TS) 277666 Total Suspended Solids (TSS) 783 Gasoline 1 Mineral Spirits LOD Kerosene <1 Diesel Fuel 1 Motor Oil LOD Total extractable hydrocarbons (TEH) 2

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Current Approach Slow

Total=1‐2 days

TRU TEVA

MnO2 Po Th U

4 Hours

(Autodeposition)

3‐16 Hours 0.5‐1 Hour 0.5‐1 Hour 0.5‐1 Hour

(Ce Hydroxide

• r Ce Fluoride

Microprepitation)

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Faster Approach

Total: 4+ hours

TRU TEVA

MnO2 Po Th U

3‐16 Hours 0.5‐1 Hour Ce Hydroxide microprecipiation 15‐30 min

SR

Waste

0.1M Bioxalate or 0.1M HNO3 0.1M Bioxalate 0.1M HCl 4M HCl

4

Polonium Recovery ≥ 100%

SR

0.1M Bioxalate or 0.1M HNO3

Po

Po‐209 Po‐210 Bi‐212 Po‐212

Th daughters?

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Uranium Recovery ≈ 13%

TEVA

U

0.1M HCl

U‐232

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Thorium Recovery ≈ 85 %

TRU

Th

0.1M Bioxalate

Th‐230 Th‐228 Th‐228 daughters

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Discussion

• Reconsider preconcentration technique?
• Uranium recovery from matrix interference?
• Carbonates?
• Is there a more robust resin for U, Th, Po?

– Improve resolution of Ce(OH)3 precip for Po?

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Thank You!

• State Hygienic

Laboratory at UIowa

– Marinea Mehrhoff – Dustin May

• University of Iowa

– Dr. Michael K Schultz – Eric Eitrheim – Andrew Knight

• Environmental

Management Solutions

– Robert Shannon – Dr. Robert Litman

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