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有机磷化合物合成用的三氯化磷中游离磷含量要求在十万分之一以下,碘量法,钼蓝法、铜试纸法等都因操作繁复、误差大而不敷应用。我们将三氯化磷中的游离磷提取到苯层中,在表面活性剂存在下,用硝酸银与其发生定量反应生成银胶,可进行比色测定。本法优点是操作简便,可测定低至0.01毫克磷。样品分析手续: 将自行吹制的空心玻璃球(直径8—12毫米并带有吸取样品的毛细短管)小心加热,立即把短管插入三氯化磷样品中,待样品吸入3—4克后取出,用火将毛细管封闭。准确称重后放入已
Organic phosphorus compounds used in the synthesis of phosphorus trichloride free phosphorus content requirements below one hundred thousandth, iodometric method, molybdenum blue method, copper test paper method and so complicated because of the operation, the error is not large enough application. We extract the free phosphorus in phosphorus trichloride into the benzene layer, and in the presence of the surfactant, silver nitrate and its quantitative reaction to produce silver glue, can be colorimetric determination. This method has the advantage of easy operation, measurable as low as 0.01 mg of phosphorus. Sample Analysis Procedure: Carefully heat self-blown hollow glass spheres (8-12 mm in diameter with capillary wicks for sample aspiration) and immediately insert the stub into the sample. Add 3-4 g After removing, the capillaries will be closed with fire. Accurately weighing into the already