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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Catalytic-kinetic determination of trace amount of formaldehyde by the spectrophotometric method with a bromate-Janus green system
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Catalytic-kinetic determination of trace amount of formaldehyde by the spectrophotometric method with a bromate-Janus green system

机译:溴酸盐-贾努斯绿体系光度法催化动力学测定痕量甲醛

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摘要

A new simple and rapid catalytic kinetic method for the determination of trace amount of formaldehyde is described. The method is based on the catalytic effect of formaldehyde on the oxidation of Janus green by bromate in the present of sulfuric acid. The reaction monitored spectrophotometrically by measuring the decrease in absorbance of the reaction mixture at 618 nm. The fixed-time method was used for the first 150 s. For initiation of the reaction, under the optimum conditions, in the concentration range of 0.003-2.5 mu g ml(-1) formaldehyde can be determined with a limit of detection 0.0015 mu g ml(-1). The relative standard deviation of five replicate measurements is 2.3% for 1.0 mu g ml(-1) of formaldehyde. The method was used for the determination of formaldehyde in real samples with satisfactory results. (c) 2006 Elsevier B.V.. All rights reserved.
机译:介绍了一种测定痕量甲醛的简便,快速的催化动力学新方法。该方法基于甲醛在硫酸存在下对溴酸盐对Janus绿的氧化的催化作用。通过测量反应混合物在618nm处的吸光度降低,通过分光光度法监测反应。前150秒使用固定时间方法。为了引发反应,在最佳条件下,可以在0.003-2.5μg ml(-1)的浓度范围内测定甲醛,检出限为0.0015μg ml(-1)。五个重复测量的相对标准偏差为1.0μg ml(-1)的甲醛为2.3%。该方法用于实际样品中甲醛的测定,结果令人满意。 (c)2006 Elsevier B.V.。保留所有权利。

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