石墨消解-ICP-MS法同时测定铜精矿中4种有害元素

为弥补标准检测方法的不足，建立了石墨消解-ICP-MS法同时检测铜精矿中Pb、Cd、As 和Hg等4种有害元素。确定了样品前处理和仪器分析条件。用铜精矿标准样品和参考样品分别进行7次重复实验，Pb、Cd和As的检测结果均在标准值范围内，Hg的检测结果与参考值基本一致。7次重复检测结果的变异系数符合GB/T 27417-2017《合格评定 化学分析方法确认和验证指南》要求。选择5种不同物相铜精矿作为待测样品，通过与标准方法比对，两种方法检测结果的绝对差符合标准方法的再现性要求，说明本方法适用于不同种类的铜精矿。本方法操作简单，可同时测定多种有害元素，实用性强。

Determination of 4 Harmful Elements in Copper Concentrate by ICP-MS with Graphite Digestion

A method is presented in this paper for four harmful elements of examining copper concentrate, in order to determine Pb, Cd, As and Hg by ICP-MS with graphite digestion in order to make up for the deficiency of standard detection method. The conditions of sample pretreatment and instrumental analysis were determined. The standard sample and reference sample were used for 7 times of repeated experiments, and the detection results of Pb, Cd and As were all within the standard value range of the standard sample, while the detection results of Hg were basically consistent with the reference value. The variation coefficients of the 7 repeated tests results are in line with the relevant requirements of GB/T 27417-2017 Conformity Assessment -Guidelines on Validation and Verification of Chemical Analytical Methods. Five copper concentrates with different physical phases were selected as the samples to be tested. The absolute difference between the detection results of this method and the standard method meets the reproducibility requirements of the standard method, indicating that this method is suitable for different kinds of copper concentrates. The method is simple in operation and can be used to determine a variety of harmful elements at the same time.