Nanogold-Decorated Silica Monoliths as Highly Efficient Solid-Phase Adsorbent for Ultratrace Mercury Analysis in Natural Waters

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• 作者：Jessica Huber ; Lars-Eric Heimb眉rger ; Jeroen E. Sonke ; Sebastian Ziller ; Mika Lind茅n ; Kerstin Leopold
• 刊名：Analytical Chemistry
• 出版年：2015
• 出版时间：November 3, 2015
• 年：2015
• 卷：87
• 期：21
• 页码：11122-11129
• 全文大小：348K
• ISSN：1520-6882

文摘

We propose a novel analytical method for mercury (Hg) trace determination based on direct Hg preconcentration from aqueous solution onto a gold nanoparticle-decorated silica monolith (AuNP@SiO₂). Detection of Hg is performed after thermal desorption by means of atomic fluorescence spectrometry. This new methodology benefits from reagent-free, time- and cost-saving procedure, due to most efficient solid-phase adsorbent and results in high sensitive quantification. The excellent analytical performance of the whole procedure is demonstrated by a limit of detection as low as 1.31 ng L^鈥? for only one-min accumulation duration. A good reproducibility with standard deviations 鈮?.4% is given. The feasibility of the approach in natural waters was confirmed by a recovery experiment in spiked seawater with a recovery rate of 101%. Moreover, the presented method was validated through reference analysis of a submarine groundwater discharge sample by cold vapor-atomic fluorescence spectrometry resulting in a very good agreement of the found values. Hence the novel method is a very promising new tool for low-level Hg monitoring in natural waters providing easy-handling on-site preconcentration, reagent-free stabilization as well as reagent-free, highly sensitive detection.