火试金法测定银阳极泥中的金和银

Fire Assaying Method for the Determination of Gold and Silver in the Silver Anode Mud

运用火试金法分离并捕集银阳极泥中的金和银，灰吹所得金银合粒称重后，加入一定量纯银标准并进行二次灰吹，使金银合粒能被稀硝酸溶解。利用金不溶于硝酸的性质使金、银分离，用重量法测定金量和银量。应用于实际试料的分析，方法的精密度（RSD，n=5）分别为Au〈0．1％，Ag〈0．2％。加标回收率分别为Au：99．88％-100．67％，Ag：98．81％-100．06％。

Separate and capture the gold and silver in the silver anode mud by fire assaying.After weighing gold and silver alloy from cupellation,add a measured amount of pure silver standard substance and make the second cupellation.Thus the gold and silver alloy can be dissolved in dilute nitric acid.Then Separate gold and silver on the basis of the character that gold is insoluble in nitric acid.Consequently gold and silver was determined by gravimetric method.In the actual sample analysis,relative standard deviation(RSD,n=5)of gold and silver is less than 0.1% and 0.2% respectively.Recovery of gold obtained was in the range of 99.88%~100.67% and that of silver was in the range of 98.81%~100.06%.