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It is established that due to the interaction of sodium thiocyanate, which is an admixture in sodium thiosulfate, with mineral acids (nitrate, sulfate, chloride), slightly soluble precipitates are formed. They cause excessive ash content of polymer sulfur, which is obtained by the acid decomposition of sodium thiosulfate. Highly molecular amorphous products are formed in the medium of nitric acid, which are identified as bis (triazine-4,6-dithiol-yl-2) -polysulfide. Under the influence of sulfate and chloride acids are formed low molecular weight products with a high degree of crystallinity, which are well soluble in organic media. The conclusion is made that it is impracticable to extract these products from polymeric sulfur with sodium hydroxide solution because of its possible destruction. Кеу words: hydrogen sulfide, sodium thiosulfate, polymer sulfur, sodium thiocyanate, solubility.

STUDY OF THE INTERACTION OF SODIUM TYOCYANATE WITH THE MINERAL ACIDS AND INVESTIGATION OF THE PROPERTIES OF RECEIVED PRODUCTS