Flow injection spectrophotometric determination of formaldehyde based on its condensation with hydroxylamine and subsequent redox reaction with iron(III)-ferrozine complex.
Flow injection spectrophotometric determination of formaldehyde based on its condensation with hydroxylamine and subsequent redox reaction with iron(III)-ferrozine complex.
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DOI：
10.1016/j.talanta.2010.12.019
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发表时间：
2011-06
期刊：
影响因子：
6.1
通讯作者：
N. Teshima;S. Fernandez;Minoru Ueda;Hirokazu Nakai;T. Sakai
中科院分区：
文献类型：
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作者：
N. Teshima;S. Fernandez;Minoru Ueda;Hirokazu Nakai;T. Sakai
提出了一种测定液体介质中低浓度甲醛的流动注射分光光度法。它是基于甲醛与硫酸羟胺的缩合反应，然后铁（III）-亚铁嗪络合物与残留的羟胺发生还原反应，形成紫色的铁（II）-亚铁嗪络合物（λmax= 562 nm）。在第一个反应中，羟胺与HCHO的浓度成比例地减少，因此产生的紫色铁（II）-亚铁嗪络合物随着HCHO的增加而减少（获得负FI峰）。检测限（S/N=3）为1.6μgL−1。该方法可用于工业废水中甲醛的测定。
A flow injection (FI) spectrophotometric method is proposed for the determination of low concentration of formaldehyde (HCHO) in liquid media. It is based on the condensation of HCHO with hydroxylamine sulfate, followed by the reduction reaction of iron(III)–ferrozine complex with the residual hydroxylamine to form a purple iron(II)–ferrozine complex (λmax=562nm). In the first reaction, hydroxylamine decreases proportionally to the concentration of HCHO, and therefore the produced purple iron(II)–ferrozine complex decreases with increasing HCHO (a negative FI peak is obtained). The detection limit (S/N=3) was 1.6μgL−1. The method can be applied to the determination of HCHO in industrial wastewater.