Zhao Bingshan, He Man, Chen Beibei, Hu Bin
Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan 430072, China.
Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan 430072, China.
Talanta. 2018 Jun 1;183:268-275. doi: 10.1016/j.talanta.2018.02.081. Epub 2018 Mar 19.
In this work, poly(1-vinylimidazole) functionalized magnetic nanoparticles (PVIM-MNPs) were prepared and adopted for the adsorption of silver nanoparticles (AgNPs) and silver ions (Ag ions). With the use of mercaptosuccinic acid as a ligand exchanger, both of AgNPs and Ag ions could be adsorbed on the PVIM-MNPs and the sequential desorption of Ag ions and AgNPs was easily achieved by using NaSO and HNO, respectively. Based on it, a new approach by coupling ligand-assisted magnetic solid phase extraction (MSPE) with graphite furnace atomic absorption spectrometry (GFAAS) detection was proposed for the speciation of AgNPs and Ag ions in environmental water samples. Factors affecting MSPE of AgNPs and Ag ions were investigated and the optimized conditions were established. With an enrichment factor of 100-fold, the detection limits of the proposed method were 7.5 and 8.2 ng L for Ag ions and AgNPs with relative standard deviations of 6.4% and 7.0% (c = 50 ng L, n = 7), respectively. The proposed ligand-assisted MSPE-GFAAS method has the advantages of high sensitivity, low cost and easy operation, and could be used for the quantification of Ag ions and various coating modified AgNPs with a size range of 5-120 nm in environmental waters.
在本工作中，制备了聚（1-乙烯基咪唑）功能化磁性纳米粒子（PVIM-MNPs），并将其用于吸附银纳米粒子（AgNPs）和银离子（Ag离子）。以巯基琥珀酸作为配体交换剂，AgNPs和Ag离子均可吸附在PVIM-MNPs上，并且分别使用NaSO和HNO可轻松实现Ag离子和AgNPs的顺序解吸。基于此，提出了一种将配体辅助磁性固相萃取（MSPE）与石墨炉原子吸收光谱法（GFAAS）检测相结合的新方法，用于环境水样中AgNPs和Ag离子的形态分析。研究了影响AgNPs和Ag离子MSPE的因素，并确定了优化条件。该方法的富集倍数为100倍，Ag离子和AgNPs的检测限分别为7.5和8.2 ng L，相对标准偏差分别为6.4%和7.0%（c = 50 ng L，n = 7）。所提出的配体辅助MSPE-GFAAS方法具有灵敏度高、成本低和操作简便的优点，可用于环境水样中Ag离子和尺寸范围为5-120 nm的各种涂层修饰AgNPs的定量分析。
