FIELD: analytic chemistry, metallurgy, ecology, medicine, food industry. SUBSTANCE: in the capacity of organic ligand there is used 2-carboxy-2-hydroxo-5-sulfophormazilbenzole. Content of ions of metals is found by color scale made up by reference solutions of corresponding ions of metals with due account of pH values and lengths of waves of maximum light absorption of complexes. EFFECT: enhanced selectivity of joint detection of ions of toxic metals. 5 tbl
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