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黄磷中砷的含量,视黄磷的应用目的的不同而有不同的要求。目前,工业黄磷标准中无测砷项目。根据出口食品工业用黄磷的质量要求,我们对黄磷中砷的测定进行了试验,提出了测定砷的方法。我们采用硝酸分解黄磷试样,并用二乙基二硫代氨基甲酸银(简称DDC—Ag)光度法测定黄磷中的砷,回收率大于94％,标准偏差小于±0.00040％。该法比溴化汞硅胶柱色层容积比色法准确度高。
Phosphorus in the arsenic content, depending on the purpose of the application of yellow phosphorus have different requirements. At present, there is no measurable arsenic in the industrial phosphorus standard. Based on the quality requirements of yellow phosphorus for the export food industry, we tested the determination of arsenic in yellow phosphorus and proposed a method for the determination of arsenic. We use nitric acid to decompose the yellow phosphorus sample, and use the diethyldithiocarbamate (DDC-Ag) spectrophotometry to determine arsenic in the yellow phosphorus. The recovery rate is more than 94% and the standard deviation is less than ± 0.00040%. This method is more accurate than the colorimetric method of column chromatography of mercury bromide.