容量法测定方铅矿中高含量银  

Volumetric Determination of Silver in Galena Ore

作　　者：刘茂荣 

机构地区：[1]内蒙古地质矿产勘查开发局第四地质矿产勘查开发院岩矿测试中心,内蒙古集宁012000

出　　处：《岩矿测试》2001年第2期147-149,共3页Rock and Mineral Analysis

摘　　要：报道了采用HNO3-H2 SO4-HF溶样 ,KI容量法测定硅、铅含量较高样品中高含量银的方法。试验了滴定反应的酸度条件。在 1 .6mol/LHNO3介质中 ,银与碘化钾反应 ,生成碘化银沉淀。银的标准加入回收率为 97.8%～ 1 0 0 .4%。精密度试验 ,相对标准偏差为 0 .92 % (n =1 1 )。该法可溶解含硅银矿及角银矿中的银。A method for KI volumetric determination of high content silver in galena was reported in this paper. Samples with high contents of silicon and lead were decomposed with HNO 3 H 2SO 4 HF.Acidity for the KI volumetric determination of silver was also tested. The results show that in 1.6 mol/L HNO 3 medium silver reacts with potassium iodide and forms silver iodide precipitate. The recovery of standard addition for silver by this method is 97.8%～100.4% with precision of 0.92% RSD ( n =11). The method is suitable for the dissolution of silver in silicon bearing silver ores and kerargyrite ores and has been applied to the determination of high content of silver in ores.

关 键 词：容量法 银 方铅矿 角银矿 硅 铅 滴定反应 

分 类 号：P578.22[天文地球—矿物学] P575[天文地球—地质学]