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Detection and separation of Fe(II) and Fe(III) in aqueous solution by laser-induced breakdown spectroscopy coupled with chelating resin enrichment and pH value adjustment
Journal of Analytical Atomic Spectrometry ( IF 3.4 ) Pub Date : 2020-11-09 , DOI: 10.1039/d0ja00292e
Peichao Zheng 1, 2, 3, 4, 5 , Huaidong Zhao 1, 2, 3, 4, 5 , Jinmei Wang 1, 2, 3, 4, 5 , Ranning Liu 1, 2, 3, 4, 5 , Ning Ding 1, 2, 3, 4, 5 , Xuefeng Mao 1, 2, 3, 4, 5 , Chunhong Lai 1, 2, 3, 4, 5
Affiliation  

Ferrous iron (Fe(II)) is essential to organisms, but ferric iron (Fe(III)) is toxic. Monitoring Fe(II) and Fe(III) in solution can improve our understanding of Fe biogeochemistry and toxicity. However, it is difficult to rapidly determine Fe in different valence states in solution using traditional methods. A novel method, laser-induced breakdown spectroscopy coupled with chelating resin selective enrichment by adjusting the solution pH, for determining Fe(II) and Fe(III) in solution is presented here. The sample solution flow rate and solution pHs were optimized to obtain a better enrichment effect. The calibration curve for Fe(II) and Fe(III) were established and the limits of detection were 0.120 mg L−1 and 0.142 mg L−1, respectively. Single valence state Fe in an Fe(II) and Fe(III) mixed solution was separated based on the enrichment abilities of Fe(II) and Fe(III) at different pH values of the chelating resin, and the separation relative error ranges were 0.25%–1.12% and 3.05%–7.24%, respectively. The recoveries of Fe(II) and Fe(III) in real spring water were 100.62% and 99.11%, respectively. The results indicated that the method of LIBS coupled with chelating resin selective enrichment can rapidly and accurately quantify Fe in different valence states in aqueous solution.

中文翻译:

激光诱导击穿光谱结合螯合树脂富集和pH值调节检测并分离水溶液中的Fe(II)和Fe(III)

亚铁(Fe(II))对生物至关重要,但三价铁(Fe(III))有毒。监测溶液中的Fe(II)和Fe(III)可以增进我们对Fe生物地球化学和毒性的了解。然而,使用传统方法难以快速确定溶液中不同价态的铁。本文介绍了一种新颖的方法,即激光诱导击穿光谱法,通过调节溶液的pH值与螯合树脂选择性富集相结合,以确定溶液中的Fe(II)和Fe(III)。优化了样品溶液的流速和溶液的pH,以获得更好的富集效果。Fe(II)和Fe(III)的校准曲线确定了),检出限分别为0.120 mg L -1和0.142 mg L -1。根据Fe(II)和Fe(III)在螯合树脂的不同pH值下的富集能力,分离出Fe(II)和Fe(III)混合溶液中的单价态Fe。分离的相对误差范围为分别为0.25%–1.12%和3.05%–7.24%。Fe(II)和Fe(III)的回收率)在实际泉水中分别为100.62%和99.11%。结果表明,LIBS结合螯合树脂选择性富集的方法可以快速,准确地定量水溶液中不同价态的铁。
更新日期:2020-11-09
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