title: Carbon nanotube sponges as a solid-phase extraction adsorbent for the enrichment and determination of polychlorinated biphenyls at trace levels in environmental water samples.
abstract: Carbon nanotube (CNT) sponges has recently attracted considerable attention in numerous fields because of its excellent properties, such as high porosity, light weight, and large surface area. The potential of CNT sponges for the solid-phase extraction (SPE) of organic pollutants at trace levels was investigated in this study for the first time. Seven polychlorinated biphenyls (PCBs) were selected as analytes, and gas chromatography-tandem mass spectrometry was employed for the detection. We optimized important parameters that may influence the efficiency of SPE, including the kind and volume of elution solvent, sample pH, and sample flow rate and volume. Under optimized conditions, low limits of detection (0.72-1.98ngL(-1)), wide range of linearity (10-1000ngL(-1)) and good repeatability (2.69-6.85%, n=5) were obtained. CNT sponges exhibited higher extraction performance than other adsorbent materials under the optimized conditions. Real environmental water samples were analyzed, and satisfactory recoveries (81.1-119.1%) were achieved. All these results demonstrated that CNT sponges are suitable SPE material for the enrichment and sensitive determination of PCBs at trace levels.
authors: Key Laboratory for Applied Technology of Sophisticated Analytical Instruments of Shandong Province, Analysis and Test Center, Shandong Academy of Sciences, Jinan 250014, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China.
authors: Lei
authors: L
authors: Wang
authors: Key Laboratory for Applied Technology of Sophisticated Analytical Instruments of Shandong Province, Analysis and Test Center, Shandong Academy of Sciences, Jinan 250014, China. Electronic address: xia-w21cn0@163.com.
authors: Xia
authors: X
authors: Wang
authors: School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China.
authors: Jia-Bin
authors: JB
authors: Zhou
authors: Key Laboratory for Applied Technology of Sophisticated Analytical Instruments of Shandong Province, Analysis and Test Center, Shandong Academy of Sciences, Jinan 250014, China. Electronic address: zhaors1976@126.com.
authors: Ru-Song
authors: RS
authors: Zhao
keywords: Carbon nanotube sponges; Gas chromatography–tandem mass spectrometry; Polychlorinated biphenyls; Solid-phase extraction