碘酸钾-酸性铬蓝K催化动力学光度法测定人发中微量铁
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摘要
研究了在p H=2的Na2SO4-Na HSO4体系中,微量铁离子催化碘酸钾氧化酸性铬蓝K褪色反应。在525 nm波长处,控制适当实验条件,指示反应速度指示值log(A0/At)与铁离子的浓度成正比,据此建立了测定痕量铁的新催化动力学光度法,实现了铁离子的催化动力学分析法测定。此方法对人发中铁的测定,相对标准偏差3. 5%(n=5),回收率为96. 2%,结果令人满意。
In the pH = 2 system of Na2 SO4-NaHSO4 solution,Fe3+catalysises potassium iodate oxidation acidic chromium blue K fading reaction was studied. At 525 nm wavelength,controlling the optimum condition,the value log( A0/At) of indicating reaction speed was directly proportion with the concentration of the Fe3+. The catalysis dynamics spectrophotometric determination of Fe3+was realized. Maximum relative error of the training groups was 3. 3%. The presentative method was successfully applied to the determination iron of people's hair. The relative standard deviation was3. 5%( n = 5),recovery was 96. 2%. The satisfactory result was obtained.
In the pH = 2 system of Na2 SO4-NaHSO4 solution,Fe3+catalysises potassium iodate oxidation acidic chromium blue K fading reaction was studied. At 525 nm wavelength,controlling the optimum condition,the value log( A0/At) of indicating reaction speed was directly proportion with the concentration of the Fe3+. The catalysis dynamics spectrophotometric determination of Fe3+was realized. Maximum relative error of the training groups was 3. 3%. The presentative method was successfully applied to the determination iron of people's hair. The relative standard deviation was3. 5%( n = 5),recovery was 96. 2%. The satisfactory result was obtained.
引文
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[6]陈瑞战,辛红,王晓菊,等.过氧化氢氧化溴百里酚蓝催化动力学光度法测定痕量铁(Ⅲ)[J].长春师范大学学报,2001,20(2):1233-1233.
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[2]王文元,吴瑕.愈创木酚催化光度法测定痕量铁(Ⅲ)[J].理化检验(化学分册),2011,47(6):633-635,639.
[3]申湘忠,刘志成.催化光度法测定痕量铁[J].理化检验(化学分册),2009,45(6):661-663.
[4]韩虹,韩星,苏天鹅.催化动力学光度法测定水果中的痕量铁[J].广州化工,2015,43(11):129-130,167.
[5]开小明,方皓文.溴酸钾氧化酸性铬蓝K催化动力学光度法测定铁[J].光谱实验室,2013,30(5):2113-2116.
[6]陈瑞战,辛红,王晓菊,等.过氧化氢氧化溴百里酚蓝催化动力学光度法测定痕量铁(Ⅲ)[J].长春师范大学学报,2001,20(2):1233-1233.
[7]龙文清.催化光度法同时测定铜和铁[J].理化检验(化学分册),2001,37(1):12-13.