摘要
本文通过测定以EDTA-NH_4OH-H_2O_2为溶剂浸取方铅矿时滤液中硫的存在状态,从而确认方铅矿中类质同象银不能定量回收的原因,是由于生成了硫化银沉淀。提出以EDTA-NH_4OH-丙酮氰醇-H_2O_2为溶剂浸取方铅矿中类质同象银,以消除S^(2-)的干扰,在此条件下,银的回收率为100%,同时拟定了测定方铅矿中自然银和硫化银分离的方法。
By determinating sulphur species in the filtrate after soaking galena in EDTA-NH_4OH-H_2O_2solution, it is recognized that the reason why the isomorphic silver in galena cannot be recovered is due to the formation of silver sulfide precipitate. EDTA-NH_4OH-2-hy droxy-iso-butylnitrile-H_2O_2 as a selective solvent is proposed for dissolution of isomorphic silver in galena, so that the interference of S will be eliminated. The method of separation and determination for metallic silver and its sulphide in galena are described.
出处
《分析试验室》
CAS
CSCD
北大核心
1990年第2期8-11,共4页
Chinese Journal of Analysis Laboratory
