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首页> 外文期刊>Mikrochimica Acta: An International Journal for Physical and Chemical Methods of Analysis >A nanoporous carbon material coated onto steel wires for solid-phase microextraction of chlorobenzenes prior to their quantitation by gas chromatography
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A nanoporous carbon material coated onto steel wires for solid-phase microextraction of chlorobenzenes prior to their quantitation by gas chromatography

机译：涂覆在通过气相色谱定量之前的用于固相微萃取氯苯的纳米孔碳材料

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摘要

A nanoporous carbon material was synthesized by heating potassium citrate without using a template or an activating agent. It is shown to represent a viable coating for use in solid-phase microextraction. The material is thermally stable and mainly consists of amorphous sheets of sp(2)-bonded carbon. It has an extensive pore structure and a surface area as large as 1236 m(2).g(-1). The nanoporous carbon was deposited on the surface of steel wires, and the resulting fibers were applied to the extraction of trace levels of chlorobenzenes in water samples. Following extraction by absorbing, the chlorobenzenes were quantified by gas chromatograph in combination with electron capture detection. Extraction temperature and time, and desorption temperature were optimized (80 degrees C, 10 min and 310 degrees C). Under optimized conditions, the calibration plots are linear in the following concentration ranges: 2.5 to 100 ng.L-1 (pentachlorobenzene), 5 to 200 ng.L-1 (1,2,3,4-tetrachlorobenzene), 10 to 100 ng.L-1 (hexachlorobenzene) and 10 to 500 ng.L-1 (1,2,3-trichlorobenzene, 1,2,4-trichlorobenzene, 1,3,5-trichlorobenzene). Other figures of merit include (a) high enrichment factors (8324 to 9920), (b) low limits of detection (0.10-1.03 ng.L-1), and (c) good reproducibility (relative standard deviations including intra-day and inter-day with a single fiber and fiber-to-fiber were below 6.4% at a mixed concentration level of 2.5, 5, and 10 ng.L-1 respectively in ultra-water). This method was successfully applied to the determination of chlorobenzenes in (spiked) lake waters where it gave recoveries between 82.3% and 104.5%.
机译：通过在不使用模板或活化剂的情况下加热柠檬酸钾来合成纳米孔碳材料。示出表示用于固相微萃取的可行涂层。该材料是热稳定的，主要由SP（2）合并碳的非晶片组成。它具有广泛的孔结构和表面积大至1236米（2）.g（-1）。纳米多孔碳沉积在钢丝的表面上，并将所得纤维施用于水样中氯苯的痕量水平。通过吸收提取后，通过气相色谱仪与电子捕获检测组合定量氯苯。提取温度和时间，优化解吸温度（80℃，10分钟和310℃）。在优化条件下，校准图是线性的以下浓度范围：2.5至100ng.L-1（五氯苯），5至200ng.L-1（1,2,3,4-四氯苯），10至100 Ng.L-1（六氯苯）和10至500ng.L-1（1,2,3-三氯苯，1,2,4-三氯苯，1,3,5-三氯苯）。优选的其他图包括（a）高富集因子（8324至9920），（b）低检测限率（0.10-1.03 ng.l-1），（c）良好的再现性（相对标准偏差，包括日内和日内单纤维和纤维至纤维的白天在超水中分别在2.5,5和10ng.L-1的混合浓度水平下低于6.4％。该方法成功地应用于（尖刺）湖水中的氯苯的测定，其中它在82.3％和104.5％之间进行了回收率。

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