Gypsum determination in soils by conversion to water-soluble sodium sulfate
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United States of America Patent
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Jan 21, 1997
Grant Date -
N/A
app pub date -
Oct 23, 1995
filing date -
Oct 23, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Precise and accurate determination of gypsum in soils has been difficult, laborious and time consuming by currently available methods. The present invention solves such problems by: 1) Direct removal of nongypsic sulfate from 2-g soil sample with 25-mL portion of 50-% (v/v) ethanol, thus, eliminating positive errors in gypsum measurement from sulfate analysis while causing essentially no loss in gypsum content of the sample, and 2) stoichiometric conversion of soil gypsum to Na.sub.2 SO.sub.4 and CaCO.sub.3 (s) by two equlibrations of the soil sediment with 25-mL increments of 0.5M Na.sub.2 CO.sub.3 solution plus 30-s sonification. The SO.sub.4 in the supernatent solution is centrifuge separated, analyzed by the standard BaSO.sub.4 gravimetric and turbidimetric methods, and gypsum content is computed from equation [8]: gypsum(g)/soil(kg)=[SO.sub.4 (g) /soil(kg)(172/96.1)] [8]
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