| 氧化偶氮胂Ⅲ褪色光度法测定微量碘的研究 |
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| 引用本文： | 严金龙,孙汝东.氧化偶氮胂Ⅲ褪色光度法测定微量碘的研究[J].食品工业科技,2001,22(1):78-79. |
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| 作者姓名： | 严金龙 孙汝东 |
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| 作者单位： | 盐城工学院化学工程系, |
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| 摘 要： | IO
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| 关 键 词： | 偶氮胂 褪色光度法 碘 |
Photometric determination
of microamounts of iodine by oxidative color fading of arsinazo |
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| Yan Jinlong et al.Photometric determination
of microamounts of iodine by oxidative color fading of arsinazo[J].Science and Technology of Food Industry,2001,22(1):78-79. |
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| Authors: | Yan Jinlong |
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| Abstract: | The reagent arsenazo Ⅲ is oxidized by IO-3 in a H2SO4 medialeading to the decolorization of the reagent.The decrease of t he color intensity is proportional to the amount of IO-3 present.The absorpt ive maximium lies at 550nm with an apparent molar absorptivity of 1.3×104 L·mol-1·cm-1.Beer's law is obeyed in the concentration range from 0 to 30μg/25ml.Based on this phenomenon,a new photometric method for the determ ination of microamounts of iodine is proposed.It has been used for the determina tion of iodine in iodates,and the recovery is between 98%～102%. |
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