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本文选用盐酸+碘化钾+次磷酸钠混合液还原钢铁试样中的硫,产生的硫化氢用氢氧化钠及抗坏血酸溶液吸收,极谱法直接测定吸收液中硫离子,操作简便,结果准确。
In this paper, hydrochloric acid + potassium iodide + sodium hypophosphite mixture was used to reduce the sulfur in the steel samples. The produced hydrogen sulfide was absorbed by sodium hydroxide and ascorbic acid solution. The polarographic method was used to directly determine the sulfur ions in the absorbing solution. The operation was simple and the result was accurate.