摘要
《矿物学报》1984年第二期上发表了用EDTA-NH_4OH、H_2O_2溶解方铅矿测定其类质同象银的报道,实验证明用上述溶剂分解方铅矿时,溶解了的类质同象银(Ag^+)与反应产生的S^(2-)又重新生成Ag_2S沉淀,使类质同象银的结果显著偏低。本文提出加入NaCN可以防止Ag_2S沉淀生成。
The dispersed silver isomorphously present in galena was separated by the mixture of EDTA-NH_4 OH-H_2O_2. Experimental results show that the dispersed silver could react with S^(z-) to precipitate Ag_2S when the galena was dissolved. Great errors would be involved in the analysis. This problem can be avoided by adding a little amount of sodium cyanide (NaCN) into the solvent.
出处
《矿物学报》
CAS
CSCD
北大核心
1989年第2期174-176,共3页
Acta Mineralogica Sinica
关键词
方铅矿
银
赋存
分析法
dispersed silver
isomorphous silver
Ag_2S precipitate
