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Phosphate Determination in Presence of Polyethylene Glycols¹

ABSTRACT

Polyethylene glycols, used in order to equilibrate aqueous solutions with unsaturated soils, interfere with colorimetric determinations of phosphate. The interference in the molybdovanadate method may be overcome by working in 25% 2-butanone, and comparing with standards containing roughly the same concentration of the polymer as the samples.

¹ Contribution from the Fertilizer Dev. and Soil Fertility Lab., Technion—Israel Inst. of Technology, Haifa. This work was supported by the USDA. Under P.L. 480. Received June 1, 1967. Approved July 31, 1967. This problem arose in connection with research for a Ph.D. thesis by E. Segall.

² Dr. R. S. Mokady was killed in action on June 9, 1967.