矿石中铜量测定锰的干扰及消除

Interference of manganese on copper content determination in ores and its elimination

摘要: 采用国家标准方法碘量法测定矿石（碳、硫含量较高）中铜时，锰的存在对其测定结果产生正干扰。实验论证了锰的干扰，确定了消除锰干扰的方法，并对其影响因素进行了考察。结果表明:采用浓盐酸还原试料中的锰，并在浸出前加入，最佳加入量为2.0 mL，加入后的加热时间为30 s,可有效消除猛的干扰。本方法测定结果的精密度为1.67 %，准确度为0.27 %，准确度和精密度良好。

Abstract: When national standard method iodometry is used to determine copper in ores(with higher carbon and sulfur content),the existence of manganese has positive interference on the results.The interference is verified via experiments and the way to eliminate it is settled.Besides,the influence factors are looked into.The results show that concentrated hydrochloric acid can reduce the manganese in the sample and it is added before leaching with optimal dosage at 2.0 mL and heated for 30 s after added effectivel eliminating the interference of manganese.The precision of determination results of the method is 1.67 %,the accuracy is 0.27 %,both good.