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Laboratory Analyses of Soils Containing Gypsum

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... State University. C.T. Hallmark - Texas A&M University ... NCSS Gypseous Soils Task Force, ASA-CSSA-SSSA, 2007. Laboratory Methods and ... Hallmark ... – PowerPoint PPT presentation

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Title: Laboratory Analyses of Soils Containing Gypsum


1
Laboratory Analyses of Soils Containing Gypsum
  • Thomas Reinsch, Richard Ferguson - USDA-NRCS
  • Wayne Hudnall - Texas Tech University
  • Curtis Monger - New Mexico State University
  • C.T. Hallmark - Texas AM University

NCSS Gypseous Soils Task Force, ASA-CSSA-SSSA,
2007
2
Laboratory Methods and Analyses Working Group
  • Chairs Richard Ferguson
  • Curtis Monger
  • Contact Richard Ferguson
  • rich.ferguson_at_lin.usda.gov
  • Other members
  • Wayne Hudnall
  • Brenda Buck
  • Tom Hallmark
  • Thomas Reinsch

3
Charges
  • Compare analytical results of gypsum analyses
    among cooperating soil survey laboratories (SSL,
    Texas Tech, Texas AM, New Mexico State).
  • Identify need for new analyses for the chemical,
    physical and mineralogical properties of soils
    with gypsum.
  • Develop and test new analytical methods for
    chemical, physical and mineralogical properties
    of soils with gypsum.

4
Comparison Analyses
  • pH (water only)
  • 1/3 Bar and 15 Bar Water Retention
  • Particle Size Distribution Analysis
  • Total Carbon, Nitrogen, Sulfur
  • Cation Exchange Capacity
  • Calcium Carbonate Equivalent, Gypsum
  • Differential Loss of Water Method (Herrero)
  • Equivalent Gypsum Content (Elrashidi)

5
Previous Efforts
  • Nelson, Klameth, Nettleton. 1978. Determining
    soil gypsum content and expressing properties of
    gypsiferous soils. SSSAJ 42659-661
  • Acetone method
  • Correction for crystal water content
  • assume 19.42 instead of theoretical 20.21
  • ADOD, corrected ADOD
  • water retention
  • 1978-2000 corrected 15 kPa when gypsum 5
  • 2000- correct all water retention data
    when
  • gypsum 1

6
  • Challenges with laboratory analysis are related
    to water
  • Heat dehydrates gypsum
  • Water dissolves gypsum
  • Impacted methods
  • Particle-Size Analysis gypsum dissolved, Ca
    causes flocculation
  • Water retention
  • Bulk density
  • Cation Extractions CEC
  • Saturated paste
  • Clay mineralogy
  • Optical mineralogy

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8
Current Developments
  • Spot Test for Soluble Sulfate
  • (F. Kaisaki R. Ferguson)
  • BaCrO4 SO4-2 BaSO4 CrO4-2
  • CrO4-2 diphenylcarbazide reddish violet
    compound
  • Hydrochloric acid added to adjust pH to between 1
    or 2
  • Does not identify source of soluble sulfate
  • Insensitive to all other common soluble anions
  • Only effective for soluble sulfate salts
  • Fine grind sample prep for acetone method

9
Current Developments
  • Equivalent gypsum content (M. Elrashidi)
  • total amounts of gypsum and soluble minerals
    expressed as gypsum () in soil
  • Elrashidi, M. A. Hammer, D. Seybold, C. A.
    Engel, R. J. Burt, R. Jones, P. 2007.
    Application of equivalent gypsum content to
    estimate potential subsidence of gypsiferous
    soils. Soil Science. 172(3)209-224.
  • Particle Size Analysis of Gypsic Soils.Justin
    Riggs, H. Curtis Monger, Mei Wang, Rebecca
    Kraimer, New Mexico State University
  • Using Elemental Analysis to Estimate Gypsum in
    Soils.Thomas Reinsch, Rich Ferguson, Patty
    Jones, USDA-NRCS

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