| 天青A-溴酸钾体系催化光度法测定微量甲醛 |
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| 引用本文： | 陈效兰,霍欢,陈朝艳.天青A-溴酸钾体系催化光度法测定微量甲醛[J].分析试验室,2007,26(3):63-65. |
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| 作者姓名： | 陈效兰 霍欢 陈朝艳 |
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| 作者单位： | 湘潭大学化学学院,湘潭,411105 |
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| 基金项目： | 湖南省教育厅自然科学基金 |
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| 摘 要： | 研究了在H2SO4介质中,微量甲醛对KBrO3氧化天青A有较强的催化作用,建立了催化光度法测定微量甲醛的新方法.方法的线性范围为0.035～0.66 mg/L,检出限为0.016 mg/L.该方法用于米粉、粉丝等食品中甲醛的测定,测定结果的相对标准偏差(RSD)小于5%,加标回收率为98.5%～101.2%.
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| 关 键 词： | 甲醛 天青A 催化光度法 |
| 文章编号： | 1000-0720（2007）03-063-03 |
| 修稿时间： | 2006-05-082006-08-29 |
Determination of trace formaldehyde by catalytic spectrophotometry with azur A-KBrO3 |
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| CHEN Xiao-lan,HUO Huan,CHEN Zhao-yan.Determination of trace formaldehyde by catalytic spectrophotometry with azur A-KBrO3[J].Chinese Journal of Analysis Laboratory,2007,26(3):63-65. |
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| Authors: | CHEN Xiao-lan HUO Huan CHEN Zhao-yan |
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| Institution: | College of Chemistry, Xiangtan University, Xiangtan 411105 |
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| Abstract: | A new catalytic spectrophotometric method for the detemtination of trace formaldehyde has been proposed. The method is based on the catalytic effect of trace formaldehyde on the reaction between potassium bromate and Azur A. The detection limit is 0.016 mg/L with linear range of 0.035 -0.66mg/L. The method has been applied to the determination of trace formaldehyde in rice flour and vermicelli. The RSD is less than 5 %. The recoveries are between 98.5% and 101.2%. |
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| Keywords: | Formaldehyde Azur A Catalytic spectrophotometry |
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