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制磷工业要求黄磷中砷的含量在100ppm以下,为了达到要求,必须选择低砷磷矿石原料。目前,砷的测定方法是成熟的。大多采用二乙基二硫代氨甲酸银溶于3%三乙醇胺-氯仿溶液中作为吸收液显色,进行光度法测定。但处理试样中存在问题,我们的经验有以下几点。一采用瓷蒸发皿黄磷及其原料在加热制备成溶液时,需在瓷蒸发皿中进行。因为瓷皿基本不含砷,不影响砷的测定。而玻璃器皿含As_2O_5经测定,一般含量约为0.11%。使用玻璃器皿处理试样,由于玻璃被热酸溶液或碱溶
Phosphate industry requirements Phosphorus in the arsenic content of 100ppm or less, in order to meet the requirements, we must choose low arsenic phosphate rock raw materials. Currently, arsenic determination method is mature. Most commonly used silver diethyldithiocarbamate dissolved in 3% triethanolamine - chloroform solution as the absorbing liquid color, photometric determination. However, there are problems in handling samples, our experience has the following points. A porcelain evaporating pot yellow phosphorus and its raw materials prepared in the heating solution, to be carried out in the porcelain evaporating dish. Because porcelain dish basically does not contain arsenic, does not affect the determination of arsenic. The glassware containing As_2O_5 by the determination, the general content of about 0.11%. Glassware is used to treat the sample because the glass is dissolved in hot acid or alkali