摘要
报道了基于2,4_二羟基苯甲醛缩硫脲合汞(Ⅱ)为载体的溶剂聚合膜阴离子敏感电极,该电极对碘离子(I-)具有高的电位选择性和灵敏度,且呈现反Hofmeister选择性行为,其选择性序列为I->Sal->SCN->-4ClO>Br->-2NO>3-NO>32-SO>Cl->2-4SO。该电极电位对碘离子呈近能斯特响应,其线性范围为2.0×10-6～1.0×10-1mol/L,斜率为-68.6mV/dec,检出限为6.0×10-7mol/L。将电极用于加碘盐中碘含量的测定,结果令人满意。
A study on the anion_selective electrode based on2,4_dihydroxybenzaldehyde thiocarbohydrazone mercury(Ⅱ)as the neutral carrier is reported.The sensor exhibits unique selectivity and high sensitivity toˉward iodide,and displays an anti_Hofmeister selectivity pattern.The electrode gives a linear response in the concentration ranges of2.0×10 -6 -1.0×10 -1 mol/L with a detection limit of6.0×10 -7 mol/L anda slope of-68.6mV/dec in buffer solutions of pH=2.8.The electrode has been applied to the determinaˉtion of iodide in food.The results obtained agreed quite well with those obtained by spectrophotometry.
出处
《分析测试学报》
CAS
CSCD
北大核心
2005年第3期95-97,共3页
Journal of Instrumental Analysis
基金
重庆市教委资助项目(021302)
