Performance of metal-organic framework MIL-101 after surfactant modification in the extraction of endocrine disrupting chemicals from environmental water samples
Performance of metal-organic framework MIL-101 after surfactant modification in the extraction of endocrine disrupting chemicals from environmental water samples
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DOI：
10.1016/j.talanta.2015.05.006
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发表时间：
2015-10-01
期刊：
影响因子：
6.1
通讯作者：
Lee, Hian Kee
中科院分区：
文献类型：
--
作者：
Huang, Zhenzhen;Lee, Hian Kee
研究了非离子表面活性剂triton X-114对金属有机骨架MIL-101的改性及其在分散固相萃取中对环境水样中4种内分泌干扰物（雌酮、17 α -乙基雌二醇、雌三醇和己烯雌酚）的预富集作用。Triton X-114分子可以被MIL-101晶体的疏水表面吸附，从而起到亲水涂层的作用，提高了MIL-101在水溶液中的分散性。Triton X-114的云点相分离加速了水溶液中萃取物的分离。该方法结合了MIL-101的多孔结构带来的强吸附能力和Triton X-114分子的自组装的有利属性。提取后用n -甲基- n -（三甲基硅基）三氟乙酰胺衍生化，气相色谱-质谱联用测定萃取物的含量。考察了表面活性剂用量、超声时间、涡流时间、溶液pH和解吸条件等因素对改性MIL-101的制备和提取的影响。在优化条件下，本方法的检出限低（0.006 ~ 0.023 ng/mL），线性范围为0.09 ~ 45 ng/mL（测定系数大于0.9980），精密度可接受（相对标准偏差为2.2 ~ 13%）。经表面修饰的MIL-101可有效地从水样中提取选定的雌激素，与未修饰的MIL-101相比，其提取性能显著提高。(C) 2015 Elsevier B.V.版权所有
The research presented in this paper explored the modification and application of a metal-organic framework, MIL-101, with nonionic surfactant-Triton X-114 in dispersive solid-phase extraction for the preconcentration of four endocrine disrupting chemicals (estrone, 17 alpha-ethynylestradiol, estriol and diethylstilbestrol) from environmental water samples. Triton X-114 molecules could be adsorbed by the hydrophobic surface of the MIL-101 crystals, and thus improved the dispersibility of MIL-101 in aqueous solution by serving as a hydrophilic coating. Cloud point phase separation from Triton X-114 accelerated the separation of extracts from the aqueous matrix. The proposed method combines the favorable attributes of strong adsorption capacity resulting from the porous structure of MIL-101 and self-assembly of Triton X-114 molecules. Post-extraction derivatization using N-methyl-N-(trimethylsilyl)trifluoroacetamide was employed to facilitate the quantitative determination of the extracts by gas chromatography-mass spectrometry. The main factors affecting the preparation of modified MIL-101, and extraction of the analytes, such as the amount of surfactant, the ultrasonic and vortex durations, solution pH and desorption conditions, were investigated in detail. Under the optimized conditions, the present method yielded low limits of detection (0.006-0.023 ng/mL), good linearity from 0.09 to 45 ng/mL (coefficients of determination higher than 0.9980) and acceptable precision (relative standard deviations of 2.2-13%). The surface modified MIL-101 was demonstrated to be effective for the extraction of the selected estrogens from aqueous samples, giving rise to markedly improved extraction performance compared to the unmodified MIL-101. (C) 2015 Elsevier B.V. All rights reserved.