FIELD: analytical methods.
SUBSTANCE: test sample is treated with copper sulfate and then with solution of N-ethyl-N-(2-hydroxyethyl)-1,4-phenylenediammonium sulfate monohydrate, and reaction product is supplemented by acetone, aged for 10 min, diluted with water, and subjected to photometrical analysis.
EFFECT: increased determination sensitivity.
2 tbl
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