高碘酸钾氧化酚藏花红催化光度法测定痕量钴(Ⅱ)  

Catalytic Spectrophotometric Determination of Trace Cobalt(Ⅱ) Based on Oxidation of Phenosafranine by Potassium Periodate

作　　者：谢建鹰[1] 雷明建 张永华[1] 

机构地区：[1]上饶师范学院化学化工学院,江西上饶334001 [2]江西省煤田地质局226地质队,江西萍乡337000

出　　处：《分析科学学报》2012年第1期104-106,共3页Journal of Analytical Science

基　　金：教育部第四批高等学校特色专业建设点资助项目(No.TS11524)

摘　　要：在HAc-NaAc(pH=4.0)缓冲溶液中,以氨三乙酸为活化剂,痕量钴(Ⅱ)可催化KIO4氧化酚藏花红褪色反应。研究了反应的最佳条件,测得反应表观活化能为65.23kJ.moL-1,据此建立了一种测定痕量钴(Ⅱ)的新方法。方法线性范围为0.010～1.20μg/25mL,检出限为8.84×10-10 g.mL-1,回收率为94%～103%,相对标准偏差(RSD)为3.6%～5.1%。该法用于粮食样品中钴(Ⅱ)的测定,结果满意。A new catalytic spectrophotometric method for the determination of trace cobalt（Ⅱ） based on the oxidetion reaction between potassium periodata and phenosafranine in the presence of nitrilotriacetic acid as an activator in HAc-NaAc buffer solution（pH=4.0） has been developed.The optimum conditions have been studied.The apparent activation energy of catalytic reaction is 65.23 kJ·mol-1.The detection limit of this method is 8.84×10-10g·mL-1 for cobalt（Ⅱ） and linear relationship is in the concentration range of 0.010～1.20 μg/25mL for cobalt（Ⅱ）.The recovery is in the range of 94%～103% and RSD is 3.6%～5.1%.The method was applied to the determination of trace cobalt in grain samples with satisfactory results.

关 键 词：酚藏花红 高碘酸钾 催化光度法 钴(Ⅱ) 

分 类 号：O657.32[理学—分析化学]