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分析方法: 粗铅:称取试样0.5～1克于300毫升烧杯中,加(1+3)硝酸30毫升,加热溶解,冷却后移入50毫升量瓶中,以水稀至刻度,摇匀. 铜合金:称取试样2～5克于400毫升烧杯中,加(1+3)硝酸50毫升,加热溶解,以水稀至约200毫升,加10毫升镧溶液(5mg·ml~(-1)),2克氯化铵,滴加氨水至沉淀生成(pH9～10)。加热煮沸2分钟,取下趁热过滤,用热的5%氨水洗涤烧杯和沉淀。将沉淀用20%热硫酸10毫升溶解于50毫升量瓶中,冷却,以水稀至刻度,摇匀. 矿石:称取试样1～2克于300毫升烧杯中,加盐酸、硝酸溶解,稀释至约150毫升,加镧溶液10毫
Analysis: crude lead: Weigh the sample 0.5 to 1 g in 300 ml beaker, add (1 +3) nitric acid 30 ml, heated to dissolve, cooled and moved into a 50 ml volumetric flask, diluted with water to the mark, shake Copper alloy: Weigh 2 to 5 grams of sample into a 400 ml beaker, add 50 ml of (1 + 3) nitric acid, heat and dissolve to dilute to about 200 ml with water, add 10 ml of lanthanum solution (5 mg · ml ~ -1)), 2 g of ammonium chloride, dropwise adding ammonia to precipitate (pH 9 ~ 10). Heat and boil for 2 minutes, remove and filter while still hot, wash the beaker and precipitate with hot 5% ammonia. The precipitate was dissolved in 20 ml of hot sulfuric acid 10 ml flask 50 ml, cooled to dilute to the mark, shake. Ore: Weigh the sample 1 to 2 grams in a 300 ml beaker, add hydrochloric acid, nitric acid dissolved, Dilute to about 150 ml, add lanthanum solution 10 ml