砷锑钼三元杂多酸光化学光度法测定痕量砷

Photochemical Spectrophotometric Determination of Microamounts of As with AsSbMo Ternary Heteropoly Acid

摘要: 砷锑钼三元杂多酸光化学分光光度法是测定0.04～1.0mg/L砷的新方法.在0.12mol/L H₂SO₄2.0×10^-4mol/LSb(Ⅲ)2.0×10^-3mol/LMo(Ⅵ)4%(V/V)甲醇介质中,As(Ⅲ)、Sb(Ⅲ)、Mo(Ⅵ)形成的三元杂多酸被紫外光还原生成三元杂多蓝(λmax=780nm).实验结果表明,方法具有灵敏度高,选择性好,操作简便等特点.

Abstract: A new photochemical spectrophotometric method for the determination of 0.40～1.0 mg/L As has been described. It is based on the fact that, AsSbMo ternary heteropoly cid was reduced to form its heteropoly by ultraviolet light in the medium of 0.12 mol/L H₂SO₄-4%(V/V) methanol-2.0×10^-4 mol/L Sb(Ⅲ)-2.0×10^-3 mol/L Mo(Ⅵ). The heteropoly blue has λ_max at 780 nm. The results show that this method has high sensitivity, good seletivity and easy to operate.