MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou, Guangdong, 510275, China.
Key Laboratory of Hunan Province for Advanced Carbon-based Functional Materials, School of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, 414006, Hunan, PR China.
Anal Chim Acta. 2021 Apr 1;1152:338226. doi: 10.1016/j.aca.2021.338226. Epub 2021 Jan 22.
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, 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.
固相萃取（SPE）是一种用于环境样品前处理的常用技术。然而，SPE 通常需要复杂的样品预处理过程，既耗时又不方便实时和现场监测。在此，通过将聚二甲基硅氧烷（PDMS）/二乙烯基苯（DVB）吸附剂涂覆在样品瓶的内壁上，开发了一种无溶剂、快速且易于使用的 SPE 装置。萃取过程和解吸过程均在瓶内进行。吸附剂中捕获的分析物通过配备在现场便携式 GC-MS 上的空气采样管热解吸并同时从瓶中吸出。与以前的工作不同，样品预处理过程不需要任何复杂和耗时的步骤，例如离心或过滤。每个样品的总分析时间不到 25 分钟，这对于快速现场检测是可行的，从而避免了常规样品储存和运输过程中样品的损失和污染。在最佳条件下，所提出的 SPE 方法表现出宽的线性范围、低的检测限（0.010-0.036μg L，远低于美国环境保护署和中国 GB3838-2002 标准规定的最高限制）、良好的瓶内重复性（6.13-7.17%，n=3）和令人满意的瓶间重现性（4.73-6.47%，n=3）。最后，该方法成功应用于现场快速检测 BTEX。BTEX 在加标水样中的回收率在 89.1%至 116.2%之间。这项工作提出了一种用于水样快速现场监测的新型 SPE 方法。
