光度法测定微量铁(Ⅲ)-基于其对溴甲酚绿与溴酸钾氧化褪色反应的催化作用
Photometric Determination of Microamounts of Fe(Ⅲ) Based on Its Catalytic Effect on the Color-fading Oxidation Reaction of Bromocresol Green with Potassium Bromate
摘 要
在0.2 mol·L-1磷酸介质中,铁(Ⅲ)对溴酸钾氧化溴甲酚绿指示剂褪色具有强的催化作用,从而建立了一种催化动力学光度法测定铁的方法.试验结果表明:在440 nm最大吸收波长处,沸水浴条件下,时间控制在12 min时,ΔA(ΔA=A0-A)趋于稳定且最大.铁(Ⅲ)的线性范围在7.2~1 800 μg·L-1内吸光度ΔA与铁(Ⅲ)浓度呈线性关系,检出限为6.8 μg·L-1.用于测定几种不同水样中微量铁(Ⅲ),所得结果与火焰原子吸收光谱法的结果一致.方法的回收率在95.5%~100.1%之间,测定值的相对标准偏差(n=6)在2.8%~4.0%之间.
催化褪色
铁
溴甲酚绿
Photometry
Catalytic color-fading
Ferric iron
Bromocresol green
Abstract
It was found that in 0.2 mol·L-1 H3PO4 medium,the redox reaction between bromocresol green and potassium bromate was strongly catalyzed by the presence of microamounts of ferric ion,leading to an enhancement of color-fading of the bromocresol green,the absorption maximum of which was found at 440 nm.The reaction attained to equilibrium by heating in a water bath at 100 ℃ for 12 min.Linear relationship between values of ΔA(ΔA=A0-A) and concentration of Fe(Ⅲ) ion was obtained in the range of 7.2-1 800 μg per L of solution.Detection limit (3S/b) of the method was found to be 6.8 μg·L-1.In analyzing samples of water of different sources by the proposed method,results obtained were in consistency with the results found by FAAS method.Values of recovery and RSD′s (n=6) obtained were in the ranges of 95.5-100.1% and 2.8%-4.0% respectively.
中图分类号 O657.31
所属栏目 工作简报
基金项目 陕西省延安大学校内专项基金(YDK2006-25)
收稿日期 2007/12/21
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备注孙雪花(1975-),女,陕西黄龙人,讲师,从事分析化学教学与研究.
引用该论文: SUN Xue-hua,CHAI Hong-mei,MA Hong-yan,LIU Zhen-ye,HUI Hui-qing. Photometric Determination of Microamounts of Fe(Ⅲ) Based on Its Catalytic Effect on the Color-fading Oxidation Reaction of Bromocresol Green with Potassium Bromate[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2009, 45(3): 343～345
孙雪花,柴红梅,马红燕,刘珍叶,惠会青. 光度法测定微量铁(Ⅲ)-基于其对溴甲酚绿与溴酸钾氧化褪色反应的催化作用[J]. 理化检验－化学分册, 2009, 45(3): 343～345
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参考文献
【1】白昕,吴静,张景欣.微波前处理火焰原子吸收法测定人发中铁、锌、钙[J].哈尔滨理工大学学报,2003,8(2):97-101．
【2】付芝,金莲,张力,等.酸性品红褪色光度法测定痕量铁(Ⅲ)[J].光谱实验室,2006,23(5):972-974．
【3】曹永林,邱凤仙.催化褪色光度法测定痕量Fe(Ⅲ)[J].理化检验-化学分册,1999,35(7):331-334．
【4】李占灵,李艳霞,王金中.阻抑甲基橙褪色动力学光度法测定痕量铁[J].分析试验室,2006,25(10):59-61．
【5】赵能武,杜薇.萃取分光光度法测定生血铁灵颗粒剂中的亚铁含量[J].微量元素与健康研究,2003,20(5):50-51．
【6】梁维安,张震宇,邹时复.磺基水杨酸紫外导数分光光度法测定微量铁[J].分析科学学报,1997,13(2):145-146．
【7】Feng S L,Guo Z J,Fan J,et al.Kinetic spectrophotometric determination of total Iron in natural water by flow injection analysis using on-line precon-centration[J].Microchim Acta,2005,149,61-65．
【8】张根成.氧氟沙星荧光光度法测定痕量铁[J].江南大学学报:自然科学版,2003,2(6):636-638．
【2】付芝,金莲,张力,等.酸性品红褪色光度法测定痕量铁(Ⅲ)[J].光谱实验室,2006,23(5):972-974．
【3】曹永林,邱凤仙.催化褪色光度法测定痕量Fe(Ⅲ)[J].理化检验-化学分册,1999,35(7):331-334．
【4】李占灵,李艳霞,王金中.阻抑甲基橙褪色动力学光度法测定痕量铁[J].分析试验室,2006,25(10):59-61．
【5】赵能武,杜薇.萃取分光光度法测定生血铁灵颗粒剂中的亚铁含量[J].微量元素与健康研究,2003,20(5):50-51．
【6】梁维安,张震宇,邹时复.磺基水杨酸紫外导数分光光度法测定微量铁[J].分析科学学报,1997,13(2):145-146．
【7】Feng S L,Guo Z J,Fan J,et al.Kinetic spectrophotometric determination of total Iron in natural water by flow injection analysis using on-line precon-centration[J].Microchim Acta,2005,149,61-65．
【8】张根成.氧氟沙星荧光光度法测定痕量铁[J].江南大学学报:自然科学版,2003,2(6):636-638．
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