高碘酸根电极指示铁(Ⅱ)催化IO_4^--柠檬酸盐反应测定微量铁  

KINETIC DETERMINATION OF THE REACTION OF IRON(Ⅱ)-INDUCED PERIODATIE-CITRATE WITH PERIODATE SELECTIVE ELECTRODE

作　　者：冯亚平[1] 陈志新 周仕林 俞汝勤[1] 

机构地区：[1]湖南大学化学化工系,长沙410082

出　　处：《分析化学》1989年第11期1022-1024,共3页Chinese Journal of Analytical Chemistry

基　　金：国家教委科学基金

摘　　要：本文探讨用高碘酸根离子电极指示铁(Ⅱ)催化IO_4^-还原反应。经实验选定柠檬酸盐作此体系的缓冲剂、还原剂和活化剂。反应的最佳pH范围为3.0—3.5,用固定时间法测定标准及样品浓度。考察了15种金属离子及12种阴离子对反应的影响。该法允许1000—10000倍于铁(Ⅱ)的金属离子存在。常见阴离子无干扰,铁(Ⅲ)不干扰测定。此法可测定1.0×10^(-6)—2.5×10^(-10)mol/L铁(Ⅱ),曾用于自来水、矿样中铁的测定。A kinetic study of Fe(Ⅱ)-induced periodate-citrate reaction was carried out with a periodate selective electrode. Citrate was selected as reductant and activator. In this medium 1.0×10^(-6)-2.5×10^(-10)mol/L of Fe(Ⅱ)can be determined in the range of pH 3.0—3.5.The effect of some cations and anions on the response of the electrode was tested. The Fe(Ⅱ) in tap water and ore was determined with relative errors of 0.2—4.1％ and standard deviations of 1.7×10^(-8)—0.12％.

关 键 词：铁 高碘酸根 选择电极 柠檬酸盐 

分 类 号：O614.811[理学—无机化学]