FIELD: chemical industry, more particularly removal of copper, iron, nickel and cobalt cations from sewage resulting from electroplating processes. SUBSTANCE: complexing agent includes symmetrical 1,2-diacylhydrazines of formula: R1-C(O)NHNHC(O)-R2 wherein R1 and R2 are C2H5-C5H11 acyl radicals or industrial mixtures thereof as mixtures in alcohol or alkali at diacylhydrazine to [Men+] molar ratio of (0.2- 0.5):1, and metal ions are subsequently withdrawn as insoluble complexes. EFFECT: simpler and cheaper purification process, greater degree of purification of water. 2 dwg, 3 ex, 2 tbl
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