Determination of iron(II) by chemiluminescence using masking ligands to distinguish interferences
Determination of iron(II) by chemiluminescence using masking ligands to distinguish interferences
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DOI：
10.1002/lom3.10279
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
K. Bolster;M. Heller;J. Moffett
中科院分区：
文献类型：
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作者：
K. Bolster;M. Heller;J. Moffett
铁(II)能催化海水中鲁米诺的氧化，该化学发光反应已被广泛应用于铁(II)的测定。该方法容易受到其他催化鲁米诺氧化的分析物的干扰。我们已经证明，在我们的实验条件下，向样品中添加二乙烯三胺五乙酸(DTPA)可以抑制铁(II)与鲁米诺的反应，而不影响其他也催化鲁米诺氧化的物质。因此，经DTPA处理的样品可用作样品空白，未经处理的海水样品与经DTPA处理的海水样品之间的差异与溶解铁(II)的浓度有关。DTPA改正已用于测量沿海环境中光还原引起的铁(II)的昼夜变异性，以及热带北太平洋东部缺氧区铁(II)的垂直分布。
Iron(II) can catalyze the oxidation of luminol in seawater and this chemiluminescent reaction has been widely used for iron(II) determination. The method is vulnerable to interferences from other analytes that catalyze luminol oxidation. We have shown that addition of diethylenetriamine pentaacetic acid (DTPA) to a sample inhibits the reaction of iron(II) with luminol, while not affecting other substances that also catalyze luminol oxidation under our experimental conditions. DTPA‐treated samples can therefore be used as sample blanks, with the difference between an untreated seawater sample and a DTPA‐treated seawater sample related to the concentration of dissolved iron(II). The DTPA correction has been applied to measure diel variability of iron(II) due to photoreduction in a coastal environment, and to measure vertical distributions of iron(II) in the eastern tropical north Pacific oxygen deficient zone.