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在铋和铅的EDTA容量法测定中,铅常以硫酸盐或钼酸盐形式沉淀而与干扰元素分离后进行滴定。为解决辉铅铋矿单矿物中铅和铋的测定,本文经试验证明,在同一份溶液中,以二甲酚橙为指示剂,以EDTA为滴定剂,在0.02～0.2N硝酸溶液中可滴定铋;在pH5.2～5.6酸度范围内可滴定铅。据此拟定了不经分离微量连续络合滴定辉铅铋矿单矿物中铋和铅的分析方法。滴定终点突跃敏锐,易于观察掌握。除铁,铜外,其他可能存在于辉铅铋矿单矿物中的元素均不干扰铋和
In the bismuth and lead EDTA volumetric assay, lead is often precipitated as sulphate or molybdate and separated from interfering elements for titration. In order to solve the determination of lead and bismuth in the single ore of lead-lead-bismuth ore, this paper proved that in the same solution, xylenol orange as indicator, EDTA as titrant, 0.02 ~ 0.2N nitric acid solution Titration of bismuth; titration of lead at pH 5.2 to 5.6 acidity. Based on this, the analytical method for the determination of bismuth and lead in the single mineral of lead-bismuthinite without separation of trace-continuous complexing was developed. Titration endpoint suddenly jump sharp, easy to observe and master. In addition to iron, copper, other elements that may exist in the single-lead pyrite bismuth ore does not interfere with the bismuth and