Preparation of graphene-coated solid-phase microextraction fiber and its application on organochlorine pesticides determination
Preparation of graphene-coated solid-phase microextraction fiber and its application on organochlorine pesticides determination
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石墨烯包覆固相微萃取纤维的制备及其在有机氯农药测定中的应用
DOI：
10.1016/j.chroma.2012.11.072
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发表时间：
2013-07-26
影响因子：
4.1
通讯作者：
Ouyang, Gangfeng
中科院分区：
文献类型：
--
作者：
Ke, Yuanyuan;Zhu, Fang;Ouyang, Gangfeng
涂层材料决定了固相微萃取(SPME)的灵敏度和选择性。石墨烯具有优异的性质，如高导热系数、优异的力学性能、优异的电子传输性能和良好的萃取能力。在这项工作中，我们将石墨烯固定在不锈钢丝上，得到了一种基于溶胶-凝胶技术的新型固相微萃取涂层。这种新型纤维具有均匀、多孔的表面，并表现出良好的热稳定性和溶剂稳定性。在优化的条件下，其对7种有机氯农药(OCPs)的萃取率高于两种商品纤维(PDMS，85um；PDMS/DVB，65um)。用自制的溶胶-凝胶-石墨烯固相微萃取纤维，对7种有机氯农药的检出限分别为0.19 ng L-1(邻，对-滴滴涕)和18.3 ng L-1(七氯)。对每根光纤的重复性进行了评估，相对标准偏差(RSD)在4.7%~10.6%之间。纤维对纤维的重复性为2.3-13.6%。该方法已成功应用于雨水中有机氯农药的测定。检出六氯苯(62.7 ng/L)、反式氯(79.6 ng/L)和对-滴滴涕(9.30 ng/L)。相对回收率在77.7%~120%之间。(C)2012爱思唯尔B.V.保留所有权利。
The coating material determines the sensitivity and selectivity of solid-phase microextraction (SPME). Graphene is predicted to have remarkable properties, such as high thermal conductivity, superior mechanical properties, excellent electronic transport properties and good extraction ability. In this work we immobilized the graphene onto a stainless steel wire to obtain a novel SPME coating based on sol-gel technique. The new fiber possessed a homogeneous, porous surface and showed excellent thermal and solvent stability. Under the optimized conditions, its extraction efficiencies for seven organochlorine pesticides (OCPs) were higher than those of two commercial fibers (PDMS, 85 mu m; PDMS/DVB, 65 mu m). Using the self-made sol-gel-graphene SPME fiber, the limits of detections for seven OCPs were found to be ranged from 0.19 ng L-1 (o,p-DDT) to 18.3 ng L-1 (heptachlor). The repeatabilities for each single fiber were evaluated and the relative standard deviations (RSDs) ranged from 4.7% to 10.6%. The reproducibilities of fiber-to-fiber were 2.3-13.6%. The developed method was successfully applied to the determination of OCPs in rainwater. Hexachlorobenzene (62.7 ng/L), trans-chlordance (79.6 ng/L) and p,p-DDT (9.30 ng/L) were detected. The relative recoveries ranged from 77.7% to 120%. (C) 2012 Elsevier B.V. All rights reserved.