期刊
ANALYTICA CHIMICA ACTA
卷 1177, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.aca.2021.338795
关键词
Mercury speciation; Metallorganic framework; Solid phase micro-extraction
Metal-organic frameworks (MOFs) are increasingly used in analytical chemistry for pre-concentration and determination of trace elements. A new methodology for speciation of inorganic and organic mercury in water was proposed, demonstrating high efficiency, low LODs, wide linear range, and acceptable analysis duration.
Metal-organic frameworks (MOFs) are increasingly used in analytical chemistry for pre-concentration of trace elements followed by their determination using modern analytical techniques. However, there are a limited number of publications concerning the use of MOFs for speciation purposes, while their structural and functional features are perspective for the element species selective extraction and preconcentration. It is known that mercury refers to the most hazardous elements which species demonstrate different toxicity, migration routes and bioavailability as well. Consequently the development of new approaches for mercury speciation in environments remains an actual objective of analytical chemistry. In present work a new methodology for inorganic and organic mercury speciation in water was proposed. This approach is based on pre-concentration using solid phase extraction ( SPE) followed by their determination directly from the solid phase with the application of the thermal release e electrothermal-atomic-absorption technique (TR-ETA-AAS). An original SPE-procedure based on the use of UIO-66 [Zr6O4(OH)(4)(bdc)(6)] in two different modes (non-modified and modified with cysteine) as a sorbent was designed. As a result of SPE as well as TR-ETA-AAS optimization the detection limits (LOD) for all listed species at the level of 0.06 mg L-1 have been achieved. It was also shown that the presence of the other elements (K, Na, Ca, Mg at the level of 100 mg L-1, and Mn, Fe, Cr, Al, Zn, Cd, Pb - of 25 mg L-1) does not affect the results obtained. The developed assay demonstrates a high efficiency, low LODs, wide linear range and admissible analysis duration. The reliability of the data obtained was confirmed by the standard addition approach and by a comparison with the results of independent analytical methods. (C) 2021 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据