| 钍试剂Ⅰ分光光度法测定痕量碘 |
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| 引用本文： | 翟好英,黄侠,黄成华,谭学蓉.钍试剂Ⅰ分光光度法测定痕量碘[J].内江师范学院学报,2009,24(8):62-64. |
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| 作者姓名： | 翟好英 黄侠 黄成华 谭学蓉 |
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| 作者单位： | 内江师范学院化学与生命科学学院,四川,内江,641112 |
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| 基金项目： | 内江师范学院青年基金项目资助 |
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| 摘 要： | 在6．0mol·L^-1 HCl介质中，碘酸根在KBr的催化作用下氧化钍试剂Ⅰ而使之褪色，且褪色程度与碘酸根含量呈线性关系，据此建立了一种测定痕量碘的新方法．实验结果表明：钍试剂Ⅰ的最大吸收波长为480nm，KIO3浓度在0．0214-8．56μg·mL^-1范围内与△A480nm之间基本符合比尔定律，其表观摩尔吸光系数ε为2．45×10^4L·mol^-1·cm^-1．该方法可直接用于测定食盐中痕量碘．
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| 关 键 词： | 钍试剂Ⅰ 碘 分光光度法 |
Spectrophotometric Determination of Trace Iodine with Thorin |
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| ZHAI Hao-ying,HUANG Xia,HUANG Cheng-hua,TAN Xue-rong.Spectrophotometric Determination of Trace Iodine with Thorin[J].Journal of Neijiang Teachers College,2009,24(8):62-64. |
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| Authors: | ZHAI Hao-ying HUANG Xia HUANG Cheng-hua TAN Xue-rong |
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| Institution: | School of Chemistry and Life Science;Neijiang Normal University;Neijiang;Sichuan 641112;China |
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| Abstract: | A new method of determination of trace amounts of iodine in edible salt was proposed. The method was based on oxidation-decoloration of thorin by iodate with KBr as the catalyst in the medium of 6.0 mol·L^-1 HCl. The results showed that the maximum absorption wavelength of thorin Ⅰ is at 480 nm. and basically conforms to Bill＇s law when KIO3 concentration stays in the range of 0.0214-8.56μg·mL^-1 and △A480nm. The apparent molar absorptivity is 2.45×10^4L·mol^-1·cm^-1. The method can be directly employed in the determination of trace iodine in table salt with desirable results. |
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| Keywords: | Thorin I Iodine Spectrophotometry |
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