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本文提出大量锶钡存在下络合滴定测定矿石中铅的新方法。在pH3～5的乙酸盐介质中用硼氢化钠还原铅(Ⅱ)至元素状态与锶锢分离,用硝酸(1+2)溶解后以硫酸-硫酸钾沉淀分离铅,以半二甲酚橙作指示剂EDTA滴定铅。研究了外来物质对测定铅的影响并获得满意结果。
This paper presents a new method for the determination of lead in ore by complexometric titration in the presence of a large amount of strontium barium. Lead (II) is reduced with sodium borohydride in acetate solution with pH 3-5 to separate the elemental state from strontium. After the solution is dissolved with nitric acid (1 + 2), lead is separated by sulfuric acid-potassium sulfate precipitation, Orange as indicator EDTA titration lead. The effect of foreign substances on the determination of lead was studied and satisfactory results were obtained.