FIELD: analytical chemistry.
SUBSTANCE: claimed method includes subsequent addition in analyte solution buffer solution and 0.01 % eosin H solution followed by measuring of solution optical density. As buffer mixture of sodium citrate solution and hydrochloric acid solution with concentration of 0.5 mol/dm3 wherein pH is adjusted up to 2.8 is used. Optical density is measured at wavelength of 545 nm with water as reference for 15 min after eosin H addition.
EFFECT: assay of increased precision decreased determination limit.
2 dwg, 3 tbl
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