Elimination of chloride interference in the phenoldisulphonic acid method of nitrate determination in soils

Abstract

A technique was developed to eliminate chloride interference using antimony (III) in the determination of nitrates in soils by phenoldisulphonic acid method. This method was found effective upto nearly 300 ppm Cl^‐ in soils ranging in pH from 5.6 to 8.3. By avoiding repeated filtrations of chloride precipitates, this method allowas quick analysis of soils for nitrates in single soil extracts containing other mineral nitrogen fractions.