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低酸度钨酸钠溶液是从钨细泥当中提取钨的水冶过程中的中间产品。它是钨酸钠溶液经硫化钠处理后再酸化所得的产物,其pH约为3。此溶液中砷的测定过去采用二乙胺基二硫代甲酸银法,但发现测得的结果偏低,误差很大。其主要原因是砷在低酸度钨酸钠溶液中形成了[AsW_(12)O_(40)]~(3-)杂多酸,此络合物在酸性及中性溶液中很稳定,而在碱性溶液中则易分解,利用此性质,用碱使其分解,然后再用二乙胺基二硫代甲酸银法来测定砷,能获得较满意的结果。本方法可测定砷0.0x～1g·l~(-1)
The low acidity sodium tungstate solution is an intermediate product in the process of extracting tungsten from tungsten fine mud. It is a sodium tungstate solution treated with sodium sulfide and then acidified product, which has a pH of about 3. The determination of arsenic in this solution used the diethylammonium dithioformate method, but the results were found to be low and the error was high. The main reason is that arsenic forms [AsW 12 O 40] 3- (3-) heteropolyacid in low acidity sodium tungstate solution. The complex is stable in acidic and neutral solution, Alkaline solution is easy to decompose, the use of this nature, with alkali decomposition, and then using diethylamine diethyldithioformate method for the determination of arsenic, can get more satisfactory results. This method can be measured arsenic 0.0x ~ 1g · l ~ (-1)