Catalytic Photometric Determination of Trace Amount of Selenium(Ⅳ) in Human Hair
摘 要
在0.025mol·L-1硫酸介质中,90 ℃水浴加热12 min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46.13,65.16 kJ·mol-1。硒(Ⅳ)的质量浓度在40 μg·L-1以内与ΔA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。
Abstract
In 0.025 mol·L-1 H2SO4 medium and heated in a water bath at 90 ℃ 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 catalytic reaction and non-catalytic reaction were found to be 46.13 kJ·mol-1 and 65.16 kJ·mol-1 respectively. Linear relationship between the values of decrease in absorbance (ΔA) and mass concentration of Se(Ⅳ) was obtained in the range within 40 μg·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.
中图分类号 O657.31
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基金项目 国家自然科学基础资助(20704020)
收稿日期 2010/2/11
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备注高玉华(1964-),男,江苏阜宁人,高级工程师,从事催化动力学方面的科研和教学工作。
引用该论文: GAO Yu-hua,CHEN Chuan-xiang,SHEN Zuo-lin,WU Ding-ming. Catalytic Photometric Determination of Trace Amount of Selenium(Ⅳ) in Human Hair[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2011, 47(4): 404~406
高玉华,陈传祥,申佐琳,武鼎铭. 催化光度法测定人发样品中痕量硒(Ⅳ)[J]. 理化检验-化学分册, 2011, 47(4): 404~406
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参考文献
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【3】GOMESA C F, MENEGARIO A A, PELLEGRINOTTI D C, et al. Ahydride generation flow system for determination of arsenic and selenium by total reflection X-ray fluorescence spectrometry[J] . Spectrochimica Acta Part B: Atomic Spectroscopy, 2004,59(9):1481-1484.
【4】STOZHKO N Y, MOROSANOVA E I, KOLYADINA L I, et al. Ceramic composite electrode for the determination of selenium by stripping voltammetry[J]. Journal of Analytical Chemistry, 2006,61(2):158-165.
【5】MAZEJ D, FALNOGA I, VEBER M, et al. Determination of selenium species in plant leaves by HPLC-UV-HG-AFS[J]. Talanta, 2006,68(3):558-568.
【6】MALEKI N, SAFAVI A, DOROODMAND M M. Determination of selenium in water and soil by hydride generation atomic absorption spectrometry using solid reagents[J]. Talanta, 2005,66(4):858-862.
【7】MASSON P, ORIGNAC D, PRUNET T. Optimization of selenium determination in plant samples by hydride generation and axial view inductively coupled plasma atomic emission spectrometry[J]. Anal Chim Acta, 2005,545(1):79-84.
【8】GARCIA J B, KRACHLER M, CHEN B, et al. Improved detrmination of selenium in plant and peat samples using hydride generation atomic fluorescence spectromet ry ( HG-AFS )[J]. Anal Chim Acta, 2005,534(2):255-261.
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