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近年来用碱性染料和磷钼杂多酸形成离子缔合物测定磷有了较快的发展。文献[11]进行了近十种碱性染料的筛选,认为孔雀绿最好,并测定了河水中的痕量磷。本实验研究了磷钼杂多酸和孔雀绿在硫酸介质中形成绿色离子缔合物的条件,已应用于试剂氢氧化钠中痕量磷的测定,得到了比较准确的结果,同时还可用本法确定的条件用目视比色法快速测定试剂氢氧化钠中的磷酸盐。此离子缔合物在表面活性剂聚乙烯醇(PVA)的存在下,在640nm处具有最大吸收,其摩尔
In recent years, with basic dyes and phosphomolybdic heteropolyacid ion association measured phosphorus has been rapid development. In [11], nearly ten basic dyes were screened, and malachite green was considered as the best and trace amounts of phosphorus in the river water were determined. This experiment studied the phosphomolybdate heteropoly acid and malachite green in sulfuric acid medium to form green ion association conditions, has been used in reagent sodium hydroxide determination of trace phosphorus, get more accurate results, but also can be used Determination of the conditions of the law using visual colorimetric rapid determination reagent phosphate in sodium hydroxide. This ion-association compound has a maximum absorption at 640 nm in the presence of the surfactant polyvinyl alcohol (PVA), and its molar