涂有吸附剂的样品瓶作为一种新型固相萃取装置,用于水中BTEX的快速现场检测。

ty10086 提交于 周三, 08/25/2021 - 16:21
文章英文标题
Sample bottle coated with sorbent as a novel solid-phase extraction device for rapid on-site detection of BTEX in water.
正文
固相萃取( solid phase extraction,SPE )是一种常用的环境样品前处理技术。但SPE通常需要复杂的样品前处理过程,耗时长,不便于实时和现场监测。本文通过在样品瓶内壁涂复聚二甲基硅氧烷( PDMS ) /二乙烯基苯( DVB )吸附剂,研制了一种无溶剂、快速、用户友好的SPE装置。提取过程和解吸过程均在瓶中进行。将捕获在吸附剂中的分析物通过装在现场便携式GC-MS上的空气采样管进行热脱附,同时从瓶中吸出。与以往的工作不同,样品前处理过程不需要任何复杂耗时的步骤,如离心或过滤。每个样品的总分析时间小于25 min,可实现现场快速检测,避免了常规样品储运过程中样品的损失和污染。在最佳条件下,该SPE方法线性范围宽,检出限低( 0.010 ~ 0.036μg L-1,远低于美国环境保护局和中国GB3838 - 2002标准限制的最大水平),瓶内重复性好( 6.13 ~ 7.17 %,n = 3 ),瓶间重复性好( 4.73 ~ 6.47 %,n = 3 )。最后,该方法成功应用于现场BTEX的快速检测。加标水样中BTEX的回收率在89.1 % ~ 116.2 %之间。本工作为水样现场快速监测提供了一种新的SPE方法。
文章内容(英文)
Solid-phase extraction (SPE) is a popular technique for environmental sample pretreatment. However, SPE usually requires complex sample pretreatment processes, which is time-consuming and inconvenient for real-time and on-site monitoring. Herein, a solvent-free, rapid, and user-friendly SPE device was developed by coating the polydimethylsiloxane (PDMS)/divinylbenzene (DVB) sorbent on the inner wall of a sample bottle. The extraction process and desorption process were both carried out in the bottle. The analytes trapped in the sorbent were thermally desorbed and simultaneously sucked out from the bottle by an air sampling tube equipped on field-portable GC-MS. Different to previous work, the sample pretreatment process didn't require any complicated and time-consuming steps, such as centrifugation or filtration. The total analysis time for each sample was less than 25 min, which was feasible for rapid on-site detection, and thus avoided the losses and contamination of samples in conventional sample storage and transportation processes. Under optimal conditions, the proposed SPE method exhibited wide linear ranges, low detection limits (0.010-0.036 μg L-1, which were much lower than the maximum levels restricted by the US Environmental Protection Agency and the Chinese GB3838-2002 standard), good intra-bottle repeatability (6.13-7.17%, n = 3) and satisfactory inter-bottle reproducibility (4.73-6.47%, n = 3). Finally, the method was successfully applied to the rapid detection of BTEX in the field. The recoveries of BTEX in spiked water samples ranged from 89.1% to 116.2%. This work presents a novel SPE approach for rapid on-site monitoring in water samples.
来源出处
Journal|[J]Analytica Chimica ActaVolume 1152, 2021. PP 338226-338226
DOI
https://doi.org/10.1016/J.ACA.2021.338226

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