高纯三氧化钨中微量硅的测定

用NaOH浓液溶解三氧化钨，柠檬酸络合钨，用硅钼蓝法测定微量硅，该法操作简单，测定范围ωSi0.0004%-0.016%，回收率在95.71%-118%之间，相对标准偏差小于14.32%，该法适合于测定高纯三氧化钨及仲钨酸铵中微量硅。

Determination of micro silicon in high-purity WO_3

WO3 is dissolved with a HaOH solution and tungsten is complexed with citric acid, then micro silicon is determined by silicon molybdic blue spectrophotometry. Simple in oper- ation, the method provides a measuring range of silicon content 0.0004%-0.016%, the re- covery between 95.71% and 118%, and the relative standard deviation less than 14.32%. The method is suitable for the determination of micro silicon in high-purity WO3 and ammo- nium paratungstate.