1 East TX Test t Sit ite (1 (1/2 /2 Treated) 2 CATION EXCHANGE - - PowerPoint PPT Presentation

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1 East TX Test t Sit ite (1 (1/2 /2 Treated) 2 CATION EXCHANGE CAPACITY ( ( CEC ) It is a measure of the quantity of cations reversibly adsorbed per unit weight of soil. CEC is expressed in meq/100 g of mass (meq is

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East TX Test t Sit ite (1 (1/2 /2 Treated)

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CATION EXCHANGE CAPACITY ( ( CEC )

 It is a measure of the quantity of cations reversibly adsorbed per unit weight of soil.  CEC is expressed in meq/100 g of mass (meq is milliequivalents )

CEC is a measure of the quantity of cations reversibly adsorbed per unit weight of soil.

 The predominant cations in soils are Ca2+, Mg2+, Na+ and K+  Percentage of CEC occupied by the basic cations is called Base

  • Saturation. Fertile soil has Base Saturation greater than 80%,

predominantly Ca and Mg.

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CATION ADSORPTION ON SOIL

Cations are held at the exchange sites with different adsorption strengths.

For most minerals the strength of adsorption depends on cationic species: Ca2+ > Mg2+ > NH4

+ > K+ >

Na+

Strength of cationic adsorption depends on the following:

Adsorption strength is directly proportional to the charge on cations. Strength of similar charge is influenced by ionic radius of the hydrated cations. The quantity of the cations added.

NH4

+ (2.5A)

K+ (3A) Na+ (4A) Mg2+ (8A) Ca2+ (6A)

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SODIUM CONTAMINATION OF SOILS

Effects of Sodium & Chlorides (NA+ Cl-)

 Osmotic pressure - plant dehydration (EC)  Loss of vital plant nutrients  Sodium toxicity

Na+ is particularly detrimental due to its toxic effect on plants and its effect on soil structure.

When a high percentage of Cationic Exchange Capacity ( CEC ) is occupied by Na+, the soil disperses.

 clays - soil deterioration - no percolation - erosion

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Elec lectric ical l Co Conductiv ivit ity (E (EC) C) & Total l Diss issolv lved So Soli lids TD TDS) S)

Soluble constituents (ions) present in the soil conduct electric current.

Ability to conduct electric current is known as Electrical Conductivity .

Controls Osmotic Pressure which effects the ability of the plant to uptake water.

EC is measured as m mhos/cm or m S/cm.

EC is an indirect measure of TDS. TDS = 613 x EC

Example: If EC = 2.0 m mhos/cm; TDS = 613 * 2.0 = 1226 mg/L. 0-2 mmhos/cm – no affect on plant life 2-4 mmhos/cm – slight affect on plant life (consistent with Rule 8 guidelines) 4-8 mmhos/cm – moderate affect on plant life 8-16 mmhos/cm – only tolerant plants yield well >16 mmhos/cm – only very tolerant plants yield well

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SODIUM ADSORPTION RA RATIO (S (SAR) & EXCHANGEABLE SO SODIUM (E (ESP)

As the presence of sodium in soil has detrimental influence on fertility, SAR is used as the comparative measure against other cationic species such as Ca and Mg. But MAY NOT reflect permanent damage. :  SAR = ( Na) / [(Ca + Mg)/2 ] 0.5

ESP reflects the Na actually attached to the soil structure and therefore indicates permanent damage. BUT it is Exchangeable Sodium  ESP ( % ) = ( NaX /CEC ) * 100 where NaX is Exchangeable Sodium (meq/100g).  Threshold level for ESP for Na is 15 %.

If SAR is known, under equilibrium condition, ESP can be imcomputed by an empirical expression ESP( % ) = 100(-0.0126 + 0.01475 SAR) / [ 1 + ( -0.0126 + 0.01475 SAR ) ]

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So So What do th the Numbers Mea ean SALI LINE to SO SODIC SO SOIL IL

  • Saline Soil:

EC > 4 m mho/cm SAR >12 ESP < 15 % Clay particles remain aggregated even after rain

  • Saline/Sodic Soil:

EC > 4 m mho/cm SAR >12 ESP > 15 % Clay particles can disperse if rain lowers the salinity

  • Sodic Soil:

EC < 4 m mho/cm SAR > 12 ESP > 15 % Clay particles disperses after rain

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Produced =

Cl- (1,000ppm)

40 50 60 70 80 90 100 +__ Water

TDS (NaCl ppm)

65.9 82.4 98.8 115.4 131.8 148.3 164.8____

Density (Lb/Gal)

8.7 8.8 8.9 9.0 9.1 9.2 9.3 9.4

< 1400 < 1350 < 1300 < 1250 < 1200 < 1150 < 1100 < 1050 < 1000 < 950 < 900 < 850 < 800 < 750 < 700 < 650 < 600 < 550 < 500 < 450 < 400 < 350 < 300 < 250 < 200 < 150 < 100

Sandy Soil

Gallons of DeSalt Plus™ per Acre

Sandy Loam Loam Clay Loam Clay Heavy Clay To use the chart below: (1) Select the appropriate soil

type (2) Determine the salt concentrations in the produced water (Cl- ppm, TDS, or water density) (3) Determine the size in acres of the contaminated area (1 acre = 43,560 square feet) (4) Using the graph, determine the DeSalt Plus™ requirements per acre (5) It is recommended that DeSalt Plus™ be diluted with fresh water at a minimum

  • f 10:1

(6) After application, irrigation with fresh water is required to accelerate the removal

  • f the contamination.

Gallons of DeSalt Plus™ per acre Based on Soil types and contaminating fluid

First Response Chart

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SODIUM SOIL REMEDIATION

  • Remediating in a timely manner necessitates lowering excess exchangeable

sodium with a stronger cationic source.

  • The active cations will displace the sodium ions present in the soil, allowing the

displaced sodium to be flushed out of the root zone by water.

  • Accumulated salts in soils contain: Na+, K+, P+ NH4+, Ca2+ and Mg2+………. as
  • cations. Na+ is particularly detrimental due to its toxic effect on plants and

its effect on soil structure. Sodic soils disperse and erode or compact becoming impermeable to water and develop a hard surface crust.

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Closure & Recommended values for farming and growing conditions:  EC 0-4  SAR < 12  Sodium < 500 ppm  ESP < 15%

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DeSalt Plu lus TM

TM a Complete Amendment System

A water soluble, active solution specially designed for prevention , reclamation & revitalization of severely salt damaged soils. The DeSalt Plus™ soil amendment links and optimizes Ca++, Mg++, K+ & NH4+ ions (stabilized to prevent conversion), selected activating

  • rganic acids, and flocculating agents, polymers and penetrants to

improve percolation and surface contact. The DeSalt Plus™ is more than a chemical, it is a system. A soil amendment system proven over nearly 20 years and 3 continents. Note: DeSalt Plus TM - no nitrates!

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Develop the Remediation Program

  • Delineate & determine contamination levels
  • EC; SAR, ESP, CEC
  • Area and depth of remediation (Cu Yds. ; Cu Meters ; Acre Ft )
  • Potential for re-contamination (evaporation/wicking)
  • Determine amendment types and requirements
  • Soil types and contamination level will dictate amendment requirements
  • Is gypsum an option? Dig & Haul? Capillary barrier needed?
  • Water availability etc.
  • Develop the Work Plan
  • Site Preparation
  • Leaching process
  • Irrigation requirements/options
  • Contamination capture and disposal options
  • Vertical vs lateral drainage
  • French drains, Capture sump, disposal etc.
  • Amendment Application
  • 1. Rip & Turn Soil (breaks soil barriers)
  • 2. Bulk with Hay or Mulch (keeps soil open)
  • 3. Apply DeSalt Plus TM - Irrigate - Monitor
  • 4. Apply GeoRinse TM (with irrigation water)
  • 5. Apply JumpStart TM (nutrients package)
  • Re-vegetate & Monitor

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New Spill on Sandy Soil (First Response Treatment)

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Break In Salt Water Line

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East Texas Pipe Line Break (F (First Response Treatment) )

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Haynesville Louisiana

  • Historical Site
  • Salt Water Disposal

Site Condition

  • Saline / Sodic
  • Sandy Clay
  • Top Soil Erosion

EC 17 - 49 SAR 12 - 64 ESP 17 - 52 CEC 6 - 15 Treatment  Install drain system  Deep plow and bulk Apply amendments  Flush with water Amendments Applied  DeSalt Plus™  GeoRinse™  JumpStart™ Test Seeding Replanting of Native Grass Time Lapse = 24 months

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Harris County, Texas

  • Historical Site
  • Salt Water Disposal System

Site Condition

  • Saline / Sodic Soil
  • Heavy Clay

EC 77 SAR 125 ESP 93 CEC 40 Treatment  Deep plow and bulk soil  Install drain pattern with bulking materials  Applied amendments  Irrigate Amendments Applied  DeSalt Plus™  GeoRinse™  JumpStart™ Re-seed with grass (&Turnips) Time Lapse = 18 months

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Montgomery County, TX

  • Saline / Sodic
  • Salt Water Leak

Site Condition

  • Sandy Clay

EC 84 SAR 38 ESP 35 CEC 17 Treatment  Test soil  Apply amendments  Flush with water Amendments Applied  DeSalt Plus™  GeoRinse™ Test Seeding Re-seeding with Native Grass Time Lapse = 9 months

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Gregg County, TX

  • Historical Site
  • Salt Water Disposal Pit

Site Condition

  • Sodic Soil
  • Top Soil Erosion
  • Sandy Clay

EC 12 SAR 27 ESP 50 CEC 5 Treatment  Deep plow and bulk soil  Apply amendments  Flush with water Amendments Applied  DeSalt Plus™  GeoRinse™ Re-seed with native grass Time Lapse = 12 months

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Terrebonne Parish, Louisiana

  • Historical Site
  • Salt Water Disposal Pit

Site Condition

  • Sodic Soil
  • Heavy Clay

EC 20 SAR 30 ESP 43 CEC 46 Treatment  Disc soil  Apply amendments  Flush with water Amendments Applied  DeSalt Plus™  GeoRinse™ Test Seeding Time Lapse = 18 months

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S E Oklahoma

  • Produced Salt Water
  • Underground pipe leak
  • 4+ Acres – 12 feet deep

Site Condition

  • Saline / Sodic
  • Red Clay
  • Top Soil Erosion

EC 30+ SAR 70 ESP 50 CEC 24 Treatment  Excavate to 12’ depth contamination & install drain tiles and sump  Bulk soil with hay and replace in 2 ft. lifts  Apply Amendments  Irrigate/Flush with water  Capture flush water and send to disposal well Amendments Applied  DeSalt Plus™  GeoRinse™  JumpStart™ Re-seed pasture Time Lapse = 16 mos.

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