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研究了在柠檬酸存在的硫酸介质中,矿石中的铋与硫脲-碘化钾-马钱子碱络合染色,用三氯甲烷在室温及100r/min条件下震荡4min萃取其络合物.络合物的最大吸收峰位于460nm处,B i(Ⅲ)含量在0～20μg范围内符合比尔定律,回归方程为Y=0.09967+0.00586X,相关系数r=0.99964.对伊犁尼勒克铜矿矿石溶液进行7次平行测量,结果表明,矿石中原矿、精矿、尾矿铋的含量分别为0.003%、0.00064%、0.0028%,RSD在0.3%～2.0%之间,摩尔吸光系数分别是5.3139×104、5.3464×104、5.3514×104,回收率在96.44%～96.74%之间,该测量方法简便易行.
In the presence of citric acid in the sulfuric acid medium, the ore bismuth and thiourea - potassium iodide - brucine complex coloration, with chloroform at room temperature and 100r / min under shaking conditions 4min extract its complex. The maximum absorption peak of the compound was at 460 nm. Beer ’s law was obeyed for the content of B i (Ⅲ) in the range of 0 ~ 20 μg. The regression equation was Y = 0.09967 + 0.00586X, the correlation coefficient was 0.99964. The results showed that the contents of bismuth in ore, concentrate and tailings were 0.003%, 0.00064% and 0.0028%, respectively, and the RSDs were between 0.3% and 2.0%. The molar absorptivities were 5.3139 × 104,5.3464 × 104,5.3514 × 104, the recovery rate between 96.44% ~ 96.74%, the measurement method is simple and easy.