Kinetic spectrophotometric method for rapid determination of trace formaldehyde in foods
Kinetic spectrophotometric method for rapid determination of trace formaldehyde in foods
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DOI：
10.1016/j.aca.2007.03.042
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发表时间：
2007-05-08
影响因子：
6.2
通讯作者：
Wang, Shuo
中科院分区：
文献类型：
--
作者：
Cui, Xiaojun;Fang, Guozhen;Wang, Shuo
建立了一种简便、灵敏的动力学分光光度测定食品中超痕量甲醛的方法。在硫酸介质中，以甲醛为催化剂，溴酸钾氧化罗丹明B(RhB)。通过测量6min后染料在515mN处的吸光度下降来监测反应。方法的精密度和准确度良好，检出限为2.90mg.L-1。对10和60微克L-1甲醛的测定，相对标准偏差分别为3.0%和1.9%。方法灵敏、选择性好，用于食品中甲醛的测定，结果令人满意。(C)2007 Elsevier B.V.保留所有权利。
A simple and sensitive kinetic-spectrophotometric method was developed for the determination of ultra trace amount of formaldehyde in food samples. The method was based on the oxidation of rhodamine B (RhB) by potassium bromate in sulfuric acid medium (formaldehyde as catalyst). The reaction was monitored by measuring the decrease in absorbance of the dye at 515 mn after 6 min. The developed method allowed the determination of formaldehyde in the range of 10-100 mu gL(-1) with good precision, accuracy and the detection limit was down to 2.90 mu g L-1. The relative standard deviations for the determination of 10 and 60 mu g L-1 of formaldehyde were 3.0% and 1.9% (n = 10), respectively. The method was found to be sensitive, selective and was applied to the determination of formaldehyde in foods with satisfactory results. (c) 2007 Elsevier B.V. All rights reserved.