火试金重量法直接测定铅精矿及其它含铅物料中的银

Direct Determination of Silver in Lead Concentrates and Lead-Contained Materiels by Fire Assay Gravimetry

系统研究了火试金重量法直接测定铅精矿、铅矿石、铅合金和含铅物料中银含量的条件,将测定结果与国家标准、行业标准方法的测定结果进行比较,并采用铅精矿国家标准物质进行验证.结果表明：测定5～71 200 g/t的银含量,相对标准偏差（RSD）和银标准加标回收率分别为0.10％～7.4％和99.10％～99.94％.分析结果与国家标准、行业标准方法测定结果吻合,验证结果与铅精矿国家标准物质认定值一致.

In this paper, analytical conditions for direct determination of silver in lead concentrates, lead ore, lead alloys and lead-contained materiels by fire assay gravimetry were systemic investigated. Comparisons of experimental data between the proposed method and the national standards and industrial standards were carried out. The reliability of the method has been validated by determination of Ag in national standard reference of lead concentrate. The results indicated that the linear ranges, relative standard deviation（RSD, n =11） and recoveries e were 5~71 200 g/t, 0.10~7.4% and 99.10%~ 99.94%, respectively. The found values were in good accord with certified values.