| 孔雀绿褪色光度法测定食盐中碘含量 |
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| 引用本文： | 石海容,袁天群,宋慧,杨逢春,翟好英.孔雀绿褪色光度法测定食盐中碘含量[J].内江师范学院学报,2009,24(10):52-54. |
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| 作者姓名： | 石海容 袁天群 宋慧 杨逢春 翟好英 |
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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： | 内江师范学院大学生科研项目资助 |
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| 摘 要： | 在0．6mol／LHCl介质中，KBr催化KIO3氧化孔雀绿而使之褪色，其在617nm处吸光度明显减小．据此建立了孔雀绿（MG）褪色分光光度法测定食盐中碘含量的新方法．研究表明，KIO3的浓度在0．214～5．14μg／mL范围内与吸光度变化值之间基本符合比耳定律．其回归方程为△A=0．0466c＋0．0023，相关系数为0．9975，表观摩尔吸光系数为9．97×10^3L·mol^-1·cm^-1。该方法简便，快速，准确，直接用于食盐中碘含量的测定．
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| 关 键 词： | 孔雀绿 碘 褪色分光光度法 |
Spectrophotometric Method for the Determination of Iodine in Iodized Salt with Malachite Green |
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| SHI Hai-rong,YUAN Tian-qun,SONG Hui,YANG Feng-chun,ZHAI Hao-ying.Spectrophotometric Method for the Determination of Iodine in Iodized Salt with Malachite Green[J].Journal of Neijiang Teachers College,2009,24(10):52-54. |
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| Authors: | SHI Hai-rong YUAN Tian-qun SONG Hui YANG Feng-chun ZHAI Hao-ying |
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| Institution: | (College of Chemistry ＆ Life Sciences , Neijiang Normal University, Neijiang, Sichuan 641112, China) |
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| Abstract: | In the medium of 0.6 mol/L hydrochloric acid, taking potassium bromide（KBr） as the catalyst of potassium i odide （KIO3） , the malachite green was oxidated and decolorized, which significantly decreased its absorbance value at 617 nm. Based on this, a new spectrophotometric method for the determination of iodine is put forth. The research shows that the Beer＇ s law is basically observed when KIO3 concentration lies in the range of 0. 214-5.14μg/mL. Its regression equation was △A= 0. 0466c＋0. 0023, the correlation coefficient 0. 9975, and the apparent molar absorption coefficient 9. 97× 10^3 L ·mol^-1·cm^-1. This method is simple, fast and accurate and thus able to be directly used in the determination of Iodine concentration in salt with satisfactory results. |
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| Keywords: | Malachite green Idodine decoloration spectrophotometric method |
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