Chemistry: analytical and immunological testing – Including sample preparation – Liberation or purification of sample or separation of...
Patent
1995-10-23
1997-01-21
Warden, Jill
Chemistry: analytical and immunological testing
Including sample preparation
Liberation or purification of sample or separation of...
436 25, 436 31, 436174, G01N 100
Patent
active
055959148
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]:
REFERENCES:
patent: 4504458 (1985-03-01), Knodsen
Saeed et al. "A Method for the Conversion of Gypsum into Sodium Sulfate"; Pak. J. Sci. Ind. Res. (1983), 26(4), 272-4.
Skaric, et al. "Sulfate and Gypsum Determination in Saline Salts". Soil Sci. Soc. Am. J., (1989), 51, 901-905.
Carrillo Sharidan
Warden Jill
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