摘要
研究了难溶复杂物料中磷的测定，先在该物料中加入盐酸和硝酸，使大部分的钙镁铁等进入溶液，以铁为载体，用六次甲基四胺做沉淀剂，使磷与钙镁分离后，沉淀及酸不溶物再用氢氧化钠熔融，以钒钼酸铵为显色剂，在5％～8％（v/v ）的硝酸溶液中，磷酸根离子与钒钼酸铵生成黄色络合物，于波长420 nm处进行光度法测定磷。本法相对标准偏差（n＝6）为1．20％～4．20％之间，测定值与标样所给数值相符。
A method for determination of phosphorus in undissolved complex material was developed . The material was dissolved with hydrochloric acid and nitric acid . The most of calcium 、magnesium and iron in the material entered the solution . Separation phosphorus and calcium 、magnesium used iron as the carrier and hexamethylene tetramine as precipitating agent .The precipitation and insolubles were melted with so-dium hydroxide .Phosphorus was determined at wavelength 420 nm by photometry using vanadium molyb-date ammonium as chromogenic agent .The reagent reacted with phosphate ions to form a stable yellow complex in 5% ~8% （ V/V） nitric acid solution .This method was applied to the determination of standard sample ,and the results agreed well with the certified values and the relative standard deviation （ n =6） was 1 .20% -4 .20% .
出处
《有色矿冶》
2014年第1期55-57,共3页
Non-Ferrous Mining and Metallurgy
关键词
磷钼钒酸
光度法
难溶复杂
磷
phosphomolybdate vanadate
photometric method
undissolved complex
phosphorus
