FIELD: chemistry.
SUBSTANCE: invention refers to additives allowing the cement treatment for chrome (VI) reduction. The additive contains the solution of tin (II) complex and carbonic acid or its salts with mole ratio of carbonic acid to tin (II) compound being in the range from 0.5:1 to 5:1. The method for preparation of said additive includes contacting of tin (II) salt with carbonic acid or with one of its salts in the presence of corresponding amount of the water. The method for preparation of the material with low chrome (VI) content includes contacting of the material with corresponding amount of the said additive. The latter is used for preparation of the material with low chrome (VI) content.
EFFECT: preparation of the solution stable during storage with constant reductive capacity of chrome (VI) ions during a long time.
13 cl, 1 dwg, 4 tbl, 9 ex
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