FIELD: analytical methods. SUBSTANCE: semiquantitative method for determining copper is performed through consecutively impregnating filter paper by 0.005-0.01 M iron chloride solution and 0.05-0.1 M sodium diethyldithiocarbaminate solution followed by determining copper concentration from colored zone length arising when liquid being examined moves over indicator paper strip wrapped by polymer film. EFFECT: simplified procedure. 3 tbl
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