METHOD OF CONCENTRATING AND DETERMINING CHROMIUM AND MANGANESE IONS IN BIOLOGICAL SUBSTRATES

摘要

FIELD: analytical methods in ecology. ^ SUBSTANCE: method comprises adding test sample to silica gel preliminarily treated with cetylpyridinium chloride and then with phenylfluorene dissolved in water-ethanol medium. Sample is treated at pH 4-5 in determination of chromium and at pH 7-8 in determination of manganese. In order to calculate content of ions, diffuse reflection values are measured on spectrophotometer at wavelengths 530 and 590 nm, respectively for chromium and manganese. ^ EFFECT: achieved 25-fold concentration of Cr(III) and Mn(III) ions and separate determination thereof in case of their common presence. ^ 2 tbl