利用跨自由液膜微电解质萃取技术预富集纳米塑料

IF 5.2 Q1 CHEMISTRY, ANALYTICAL
Muhandiramge Ranasinghe, Michael C. Breadmore, Fernando Maya
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引用次数: 0

摘要

对基于自由液膜的不对称微电解质膜萃取(µ-EME)进行了评估,用于纳米塑料的预浓缩。锥形装置(200 µL 微量移液器吸头)能够简单且可重复地形成所需的三相萃取系统,该系统由供体溶液(150 µL 样品/标准溶液)、自由液膜(FLM;10 µL 1-戊醇)和受体溶液(5 µL 5 mM 磷酸盐缓冲液,pH 10.7)组成。µ-EME后,采用二极管阵列检测的毛细管区带电泳法对通过FLM转移到受体溶液中的纳米塑料进行定量。纳米塑料在 500 V 的电压下浓缩 5 分钟后,富集因子为 20,萃取回收率为 70%。以 200 nm 磺化聚苯乙烯颗粒为模型纳米塑料,该方法的检出限(LOD,S/N = 3)和定量限(LOQ,S/N = 10)分别为 6.00×10-4% (w/v) 和 2.00×10-3% (w/v)。5.5 × 10-3%(w/v)纳米塑料的日内(n = 6)和日间(n = 6)重复性%RSD 分别为 8.5 % 和 7.2 %。µ-EME能够高效地净化样品基质并预浓缩茶叶样品基质中添加的纳米塑料。通过 FLM 对红茶中的纳米塑料进行预浓缩,富集因子为 20±3.6(n = 3),样品基质中的紫外线吸收化合物被完全去除。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Preconcentration of nanoplastics using micro-electromembrane extraction across free liquid membranes

Preconcentration of nanoplastics using micro-electromembrane extraction across free liquid membranes

Asymmetric micro-electromembrane extraction (µ-EME) based on a free liquid membrane has been evaluated for the preconcentration of nanoplastics. A conical unit (200 µL micropipette tip) enabled the simple and reproducible formation of the required three-phase extraction system consisting of a donor solution (150 µL sample/standard solution), free liquid membrane (FLM; 10 µL 1-pentanol), and an acceptor solution (5 µL of 5 mM phosphate buffer, pH 10.7). After µ-EME, nanoplastics transferred across the FLM into the acceptor solution were quantified using capillary zone electrophoresis with diode array detection. Enrichment factors >20 and extraction recoveries >70 % were achieved for nanoplastics concentrated at 500 V during 5 min. The limit of detection (LOD, S/N = 3) and limit of quantification (LOQ, S/N = 10) of the method using 200 nm sulphonated polystyrene particles as model nanoplastics were 6.00×10−4% (w/v) and 2.00×10−3% (w/v), respectively. Intraday (n = 6) and interday (n = 6) repeatability%RSD for 5.5 × 10−3% (w/v) nanoplastics were 8.5 % and 7.2 %, respectively. µ-EME enabled an efficient sample matrix clean-up and preconcentration of nanoplastics spiked in tea sample matrices. Nanoplastics preconcentrated through the FLM for black tea resulted in an enrichment factor of 20±3.6 (n = 3), with complete sample matrix removal of UV absorbing compounds.

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