磷钒钼杂多酸络合吸附波的研究及应用

Study on the Adsorptive-Complex Wave ofPhosphorus with V(Ⅴ)and Mo(Ⅴ)Het-eropoly Acid and Its Analytical Application

在Ｈ＿２ＳＯ＿４－Ｖ（Ⅴ）－钼酸铵－丙酮体系中，磷钒铜杂多酸有一个尖锐，灵敏的络合吸附波，其峰电位为－０．２６Ｖ（ｖｓ．ＳＣＥ），检测下限０．０４ｍｇ／Ｌ，峰电流与磷量在３～５０ｍｇｌ５０Ｌ范围内呈线性关系，所拟方法可用于碳锰和硅锰中磷的测定。

new oscillopolarographic method forthe determination of microamounts of phos-phorus is proposed.It is found that in a sup-porting electrolyte solution containing H_2SO_4,V(Ⅴ),ammonium molybdate ,and acetone,mi-croamounts of phosphorus form a ternary com-plex with V(Ⅴ)and Mo(Ⅴ)heteropoly acidwhich is adsorbed on the droppling mercuryelectrode and a sensitive adsorption wave canbe observed at a peak potential of -0.26V(vs.SCE).The detection limit is evaluated tobe 0.04mg/L,the linear range is 3 ～ 50μ/50mL.This method has been applied to the de-termination of phosphorus in carbon-man-ganese and silicon-manganese.