催化动力学褪色光度法测定痕量铬(Ⅵ)  

Catalytic kinetic spectrophotometric determination of trace chromium(Ⅵ)

作　　者：柴红梅[1] 高楼军[1] 连锦花[1] 刘麦蓉[1] 

机构地区：[1]延安大学化学与化工学院,延安716000

出　　处：《分析试验室》2008年第10期31-33,共3页Chinese Journal of Analysis Laboratory

基　　金：陕西省教育厅(SJG0503);延安大学科研基金(YDK2006-56)项目资助

摘　　要：在NH3-NH4Cl缓冲溶液介质中,十二烷基硫酸钠（SDS）存在下,痕量铬（Ⅵ）对H2O2氧化间甲酚紫（m-CP）的褪色反应具有强烈的催化作用,据此建立了催化动力学光度法测定痕量铬（Ⅵ）的新方法,该方法线性范围为0.04-0.36 mg/L,检出限为6.40×10^-4mg/L,可直接用于水样（山泉水和延河水）中痕量铬的测定。A new catalytic kinetic spectrophotometric method for the determination of trace chromium（ Ⅵ ） was established based on the fact that chromium（ Ⅵ） can catalyze the discolouring oxidation of m-cresol purple （m-CP） by H202 in the medium of NHa-NH-4Cl buffer solution in presence of lauryl sodium sulfate （SDS）. The linear range of the determination was 0.04 - 0.36 mg/L and detection limit was 6.40 × 10^-4 mg/L. The method has been applied to the determination of trace chromium（ Ⅵ ） in several environment water samples with satisfactory results.

关 键 词：催化动力学光度法 铬(Ⅵ) 间甲酚紫 

分 类 号：O657.32[理学—分析化学]