PHOSPHORUS ADSORPTION IN VARIOUS SOIL-WATER EXTRACTION CUP MATERIALS

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Abstract
Four different soil-water extractor cup materials were evaluated to determine the amount of soluble ortho-phosphate adsorbed by the cup during soil-water sample collection. Desorption for selected cups was also determined after equilibrium had been reached, during the adsorption tests. Teflon and the fritted glass extractor cups exhibited insignificant adsorption, but the alundum and Soil-Moisture ceramic cups adsorbed and desorbed large amounts of P. Acid-washing of the cups with 1 N HCl solution prior to testing significantly increased the amount of adsorption and, to a lesser degree, desorption of P.

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