浅析铁矿石、烧结矿中磷的快速分析方法——磷钼兰光度法、磷铋钼兰光度法

Simple Explanations of Methods for Fast Determination of Phosphor in Iron Ore and Sinter Ore On the phosphor-molybdenum-blue photometric method and the phosphor-bismuth-molybdenum-blue photometric method

磷钼兰光度法用王水溶解试样，经高锰酸钾氧化磷为正磷酸，以钼酸铵作为显色剂，用二氯化锡将黄色的磷钼黄络合物还原成兰色的磷钼兰络合物，在680nm处测定磷。磷铋钼兰光度法是用硝酸溶解试样，以高锰酸钾氧化磷为正磷酸，在铋盐的作用下，以抗坏血酸为还原剂，将磷钼黄还原为磷铋钼兰，在660nm处测定磷。通过对照试验，分析以上两种分析方法的优劣，确立了合理的分析方法，大大的提高了烧结矿中磷测定的准确度。

In the first method, the sample was dissolved by aqua regia and phosphor oxidized to phosphoric acid by potassium permanganate. With ammonium molybdate as a chromogenic reagent, stannous chloride was used to reduce yellow phosphor-molybdenum-yellow complex into blue phosphor-molybdenum-blue complex and then phosphor was determined at 680nm. In the second, the sample was dissolved by nitric acid and phosphor oxidized to orthophosphate by potassium permanganate. In the role of bismuthate, with ascorbic acid as a reductant , phosphor-molybdenum-yellow was reduced into phosphorbismuth-molybdenum-blue, and then phosphor was determined at 680nm. Through comparing the merits and faults of the two methods, a rational analytical method was set up, thus considerably increasing the degree of accuracy for determining phosphor in sinter ore.