辉钼矿中微量锡的分离与测定  

Separation and Spectrophotometric Determination of Trace Amount of Tin in Molybdenite

作　　者：赵建为[1] 李树昌[1] 王劲榕[1] 

机构地区：[1]昆明冶金研究院,云南昆明650031

出　　处：《岩矿测试》2000年第3期173-176,共4页Rock and Mineral Analysis

摘　　要：报道了在强碱性介质中用钡盐以钼酸钡形式沉淀大量Mo(Ⅵ ) ,使微量锡与大量钼分离 ,过量钡用碳酸盐清除。溶液中残余的少量钼用H2 O2 掩蔽 ,从而实现了大量钼存在下微量锡的光度法测定。方法已用于辉钼矿中微量锡的测定 ,结果与国标法相符 ,加标回收率在 94 %～1 0 5% ,8次测定的RSD≤ 3.3%。A method for separation of trace amounts of tin from molybdenum(Ⅵ) by using barium(Ⅱ) to precipitate a large amount of molybdenum(Ⅵ) in strongly basic medium was reported in this paper. Excess barium(Ⅱ) is eliminated by carbonate. Small amount of molybdenum (Ⅵ) remained in the solution is masked by hydrogen peroxide. Trace amount of tin then can be determined by spectrophotometry. The method has been applied to determination of trace amount of tin in molybdenite. The results are in agreement with those provided by GB method with recovery of 94%～105% and precision (RSD) of ≤3.3% ( n =8).

关 键 词：辉钼矿 钼酸钡 分离 锡 分光光度法 

分 类 号：P578.291[天文地球—矿物学]