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常用的钼蓝法测定砷,由于需煮沸发色,不但费时,且还原剂对钼酸铵有微弱的还原作用,生成不同程度黄色的五价钼,影响分析质量。本实验研究了加入适量锑离子在一定酸度下促进砷在室温下迅速与钼酸铵反应生成紫蓝色的砷锑钼蓝(及磷锑钼蓝)三元杂多酸,藉以测定砷和磷。应用正交试验法进行显色条件优选试验。在所选定的条件下(硫酸0.4—0.5N 钼酸铵60毫克、锑0.45毫克、抗坏血酸60毫克)砷、磷能在
The commonly used molybdenum blue method for the determination of arsenic is not only time-consuming due to the need of boiling and coloring, but also has a weak reducing effect on the ammonium molybdate, resulting in yellow-colored pentavalent molybdenum with different degrees of impact on the quality of the analysis. In this study, adding a suitable amount of antimony ions at a certain acidity to promote rapid reaction of arsenic with ammonium molybdate at room temperature to form a purple blue arsenic antimony molybdenum blue (and antimony molybdenum blue) ternary heteropolyacid, in order to determine arsenic and phosphorus . Orthogonal test method for the determination of color development conditions. Under the selected conditions (sulfuric acid 0.4-0.5N ammonium molybdate 60 mg, antimony 0.45 mg, ascorbic acid 60 mg) arsenic, phosphorus in