乙酰二茂铁对亚硫酸盐的电催化氧化及其在锅炉水中亚硫酸盐的测定

Electrocatalytic Oxidation of Sulfites by Acetylferrocene and Its Application to the Determination of Sulfites in Boiler Water

用循环伏安法研究了玻碳电极上乙酰二茂铁对亚硫酸盐的电催化氧化行为，试验发现：在中性介质中乙酰二茂铁浓度为6×10^-5mol·L^-1时该催化氧化反应的峰电流与亚硫酸盐的浓度在2．0×10^-4～2．4×10^-3mol·L^-1范围内呈线性关系，回归方程为IPa=4．962×10^-3C-0．297，相关系数为0．9997。将该方法应用于锅炉水中亚硫酸盐的测定，所得结果与碘量法测得的结果相符。测定结果的RSD（n=6）值在0．3％～1．7％之间，回收率试验结果在97．4％～118．2％之间。

Electrocatalytic oxidation behavior of sulfite by acetylferrocene （AFRC） at glassy carbon electrode was studied by cyclic voltammetry. It was found that linear relationship between peak current （Ipa） of catalytic oxidation and concentration of SO3^2- was obtained in the range of 2.0×10^-4～2.4×10^-3mol·L^-1 , when the concentration of AFRC was kept at 6×10^-5mol·L^-1. Linear regression equation obtained was as follows： IPa=4.962×10^-3C-0.297C-0. 297 （r=0. 999 7）. The proposed method has been applied to the determination of sulfites in samples of boiler water, giving results checked quite well with the results of iodometric determination. Values of RSD （n=6） and recovery obtained were in the ranges of 0. 3%-1.7% and 97. 4%-118. 2% respectively.