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在保护胶体聚乙烯醇存在下的酸性溶液中,磷钼锑三元杂多酸与罗丹明B形成的络合物具有很高的灵敏度,其最大吸收峰在585nm处;0.5～5微克磷/100毫升符合比尔定律;摩尔吸光系数为1.09×10~5;砷有干扰,应预先除去,SiO_2、TiO_2、V_2O_5(还原后)、K_2Cr_2O_7(还原后)、NaP分别为1.2、10、4、2、6毫克时对测定无干扰,其余元素无甚干扰。 仪器与试剂:721型或UVvis紫外可见分光光度计。混合显色剂:A液,20克钼酸铵(一级)溶于约100毫升温水中,加入660毫升硫酸(1+1),冷却,稀释至1000毫升。B液,0.3克硫酸肼溶于500毫升水中(用时配制)。使用时将A、B液按(1+1)混合。聚乙烯醇溶液(0.5％):取1克
In acidic solution in the presence of protective colloidal polyvinyl alcohol, the complex of phosphomolybdic antimony tri-ternary heteropolyacid and rhodamine B has high sensitivity with the maximum absorption peak at 585 nm; 0.5-5 micrograms phosphorus / 100 ml is in accordance with Beer’s Law; molar extinction coefficient is 1.09 × 10 ~ 5; arsenic is disturbed and should be removed in advance. The contents of SiO_2, TiO_2, V_2O_5 (after reduction) and K_2Cr_2O_7 , 6 mg when the determination of no interference, the remaining elements without interference. Instruments and Reagents: Model 721 or UVvis UV-vis spectrophotometer. Mixed color reagent: liquid A, 20 g of ammonium molybdate (first grade) is dissolved in about 100 ml of warm water, 660 ml of sulfuric acid (1 + 1) is added, cooled and diluted to 1000 ml. B solution, 0.3 g of hydrazine sulfate dissolved in 500 ml of water (formulated with time). Use A, B liquid by (1 + 1) mixed. Polyvinyl alcohol solution (0.5%): Take 1g