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黄磷中微量砷的测定,目前常用的有砷斑比色法,砷化氢一二乙基硫代氨基甲酸银(AgDDTC)一吡啶或马钱子碱光度法。这些方法都是使砷还原为AsH_3气体逸出,然后吸收发色,操作繁琐,条件苛严。根据文献,本文应用二硫代二安替比林甲烷(DTPM)在硫酸或磷酸介质中直接光度法对黄磷中微量砷的测定进行了试验。结果表明,此法灵敏度,选择性好,特别是能在大量磷存在下测定微量砷,因此,可不经砷磷分离而直接测定黄磷中微量砷。本文分析了湘西地区生产的黄磷实样,结果甚为满意。
Determination of trace amounts of arsenic in yellow phosphorus, arsenic speckle colorimetric method currently used, arsine a-diethyl-silver thiocarbamate (AgDDTC) a pyridine or brucine photometry. These methods are to make arsenic reduced to AsH 3 gas escape, and then absorb the hair color, cumbersome operation, harsh conditions. According to the literature, the determination of trace arsenic in yellow phosphorus by DTPA in sulfuric acid or phosphoric acid medium was studied in this paper. The results show that this method has good sensitivity and selectivity, especially for determination of trace arsenic in the presence of a large amount of phosphorus. Therefore, trace arsenic in yellow phosphorus can be measured directly without arsenic and phosphorus separation. This paper analyzes the production of yellow phosphorus in western Hunan, the result is very satisfactory.