催化光度法测定人发样品中痕量硒(Ⅳ)  

Catalytic Photometric Determination of Trace Amount of Selenium(Ⅳ) in Human Hair

作　　者：高玉华[1] 陈传祥[1] 申佐琳[1] 武鼎铭[1] 

机构地区：[1]江苏科技大学材料科学与工程学院,镇江212003

出　　处：《理化检验（化学分册）》2011年第4期404-406,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家自然科学基础资助(20704020)

摘　　要：在0.025mol·L^(-1)硫酸介质中,90℃水浴加热12min时,痕量硒(Ⅳ)对溴酸钾氧化碱蓝褪色反应有显著的催化作用,提出了催化光度法测定痕量硒(Ⅳ)的方法。该催化反应对碱蓝是假零级反应,对硒(Ⅳ)是假一级反应,催化反应和非催化反应的表观活化能分别为46.13,65.16kJ·mol^(-1)。硒(Ⅳ)的质量浓度在40μg·L^(-1)以内与△A呈线性关系,检出限(3s/k)为2.75×10~3μg·L^(-1)。方法用于人发样品中硒(Ⅳ)量的测定,测定结果与石墨炉原子吸收光谱法测得的结果相符。In 0.025 mol·L^-1H_2SO_4 medium and heated in a water bath at 90 C for 12 min.the oxidative color-fading reaction of alkali blue by potassium bromate was remarkably catalyzed by the presence of trace amount of Se（Ⅳ）.Based on these facts,a catalytic photometric method for determination of trace amount of Se（Ⅳ）was proposed.It was proved that in the catalytic process,it was a pseudo-zero order reaction for alkali blue and a pseudo-first order reaction for Se（Ⅳ）.The apparent activation energy of the calalylic reaction and non-catalytic reaction were found to be 46.13 kJ·mol^-1and 65.16 kJ·mol^-1respectively.Linear relationship between the values of decrease in absorbance（ΔA）and mass concentration of Se（Ⅳ）was obtained in the range within 40μg· L^-1.Detection limit（3s/k）found was 2.75×10^-3μg·L^-1.In analyzing sample of human hair by this method, result of Se（Ⅳ）found was in consistency with the result found by GF-AAS method.

关 键 词：催化光度法 硒(Ⅳ) 溴酸钾 人发 

分 类 号：O657.31[理学—分析化学]