测定纯铁中的痕量磷,目前多数采用正了醇—三氯甲烷萃取,磷钼蓝杂多酸比色法.但有机溶剂对人的健康有害,操作也较繁琐.依据磷酸根离子能被活性氧化铝色谱柱吸附的性质,作者研究了用活性氧化铝色谱分离磷,并以铋盐—磷钼蓝光度法直接在水相中测定的方法,得到较为满意的结果.一、试剂与装置磷标准溶液:称取105～110°C烘干的磷酸二氢钾0.2195克,用水稀至1升.即50微克/毫升,贮于塑料瓶中备用.取10毫升上述溶液,用水稀至100毫升,即5微克/毫升, Determination of trace iron in pure iron, the majority of the current use of alcohol - chloroform extraction, molybdenum blue heteropoly acid colorimetric method.But organic solvents harmful to human health, the operation is more cumbersome.According to the phosphate ion energy Adsorbed by Activated Alumina Column, the author studied the separation of phosphorus by reactive alumina and the method of direct determination by bismuth-phosphomolybdate blue spectrophotometry in aqueous phase. Equipment Phosphorus standard solution: Weigh 0.2195 grams of potassium dihydrogen phosphate dried 105 ~ 110 ° C, dilute to 1 liter with water, that is 50 micrograms / ml, stored in a plastic bottle spare. Take 10 ml of the above solution, diluted with water to 100 ml, ie 5 μg / ml,