Study on the Ternary Heteropolyacids in the Systems of P-Mo-W and As-Mo-W as well as their Application in the Spectrophotometric Determination of Low Tungsten  

作　　者：Chen, Huaxu  Shao, Guangdi  Qi, Xiaoling 

机构地区：[1] Univ of Science and Technology, China

出　　处：《Rare Metals》1990年第1期10-15,共6页稀有金属（英文版）

摘　　要：The colored associated compounds of phosphomolybdotungstate and arsenomolybdotungstate with crystal violet are introduced. Their main characters have been studied. These two associated compounds may be used to determine low tungsten with fairly high sensitivity and selectivity. Their strong point is that the interference of molybdenum can be overcome. In the presence of polyvinyl alcohol, tungsten can be determined directly in the aqueous solution.The colored associated compounds of phosphomolybdotungstate and arsenomolybdotungstate with crystal violet are introduced. Their main characters have been studied. These two associated compounds may be used to determine low tungsten with fairly high sensitivity and selectivity. Their strong point is that the interference of molybdenum can be overcome. In the presence of polyvinyl alcohol, tungsten can be determined directly in the aqueous solution.

关 键 词：Polyvinyl Alcohol SOLUTIONS SOLUTIONS COLORING SPECTROPHOTOMETERS Applications Spectroscopy  Absorption Spectrum Analysis Tungsten Compounds Spectroscopic Analysis 

分 类 号：TG146.4[一般工业技术—材料科学与工程]