双波长双指示剂催化动力学光度法测定微量铬(Ⅵ)  

Determination of Trace Chromium(Ⅵ) by Dual-wavelength and Dual-indicator Catalytic Kinetic Spectrophotometry

作　　者：柴红梅[1] 王伟[1] 尚涛涛[1] 高楼军[1] 

机构地区：[1]延安大学化学与化工学院,陕西延安716000

出　　处：《分析科学学报》2010年第5期605-607,共3页Journal of Analytical Science

基　　金：陕西省教育厅专项科研计划(09JK814);延安大学创新资助项目(D2008-61)

摘　　要：基于在pH=4.5的HAc-NaAc缓冲介质中,微量铬(Ⅵ)催化过氧化氢氧化混合指示剂(中性红和亚甲基蓝)褪色的指示反应,建立了双波长双指示剂催化动力学光度法测定微量铬(Ⅵ)的新方法。方法的线性范围为0.005～0.3μg/mL,检出限为8.7×10-4μg/mL。该方法操作简单,灵敏度高,选择性好,用于环境水样中微量铬(Ⅵ)的测定,回收率在98.5%～102.5%之间,结果满意。A new dual-wavelength dual-indicator catalytic kinetic spectrophotometric method for the determination of trace chromium（Ⅵ）was studied.The method was based on the chromium（Ⅵ）catalyzing the fading reaction of neutral red and methylene blue oxidized by hydrogen peroxide in the HAc-NaAc medium.The linear range of the method was 0.005～0.3 μg/mL and the detection limit was 8.7×10-4 μg/mL.The method was applied to determine chromium（Ⅵ）in water samples with satisfactory results.

关 键 词：铬(Ⅵ) 中性红 亚甲基蓝 双波长 双指示剂 催化光度法 

分 类 号：O657.32[理学—分析化学]