Automated determination of micro amounts of phosphate in dilute calcium chloride extracts of soils

Abstract

Abstract An Auto Analyzer II method for the colorimetric determination of micro amounts of phosphorus (<100 μg/L) in 0.01 M CaCl2 soil extracts is described. The automated procedure gave results not significantly different from manual determinations. Using data derived from four soils extracted in triplicate on three separate occasions, the relative confidence intervals for a single sample determination were found to be ± 10.6%.