Li Xiang, Li Chunmei, Chen Jianmin, Li Chunlei, Sun Cheng
Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China.
J Chromatogr A. 2008 Jul 11;1198-1199:7-13. doi: 10.1016/j.chroma.2008.05.051. Epub 2008 May 23.
The efficiency of polythiophene (PTh) was investigated as a new fiber for solid-phase microextraction (SPME). The PTh film was directly electrodeposited on the surface of a stainless steel wire in boron trifluoride diethyl etherate (BFEE) solution using cyclic voltammetry (CV) technique. PTh fibers were used for the extraction of some organochlorine pesticides (OCPs) from water samples. The extracted analytes were transferred to an injection port of gas chromatography using a laboratory-designed SPME device. The results obtained prove the ability of PTh material as a new fiber for sampling of organic compounds from water samples. This behavior is due most probably to the granulated surface of PTh film, which produces large surface areas. In this work, the optimum conditions for the preparation and conditioning of fibers and the extraction of analytes from water samples were obtained. In the optimum conditions, the limit of detection of the proposed method is 0.5-10 ng L(-1) for analysis of OCPs from aqueous samples, and the calibration graphs were linear in a concentration range of 10-10,000 ng L(-1) (R(2)>0.982) for most of organochlorine pesticides. Single fiber repeatability and fiber-to-fiber reproducibility were less than 12 and 18% (n=5), respectively. The PTh fiber was used to monitor the OCPs in real water samples, and the results compared favorably with the data determined by commercially available carbowax/divinylbenzene (CW/DVB) fiber.
研究了聚噻吩（PTh）作为一种用于固相微萃取（SPME）的新型纤维的效率。采用循环伏安法（CV）技术，将PTh膜直接电沉积在不锈钢丝表面的三氟化硼二乙醚（BFEE）溶液中。PTh纤维用于从水样中萃取一些有机氯农药（OCPs）。使用实验室设计的SPME装置将萃取的分析物转移至气相色谱的进样口。所得结果证明了PTh材料作为从水样中采集有机化合物的新型纤维的能力。这种行为很可能归因于PTh膜的颗粒表面，其产生了较大的表面积。在这项工作中，获得了纤维制备和老化以及从水样中萃取分析物的最佳条件。在最佳条件下，该方法对水样中OCPs分析的检测限为0.5 - 10 ng L⁻¹，大多数有机氯农药的校准曲线在10 - 10000 ng L⁻¹浓度范围内呈线性（R²>0.982）。单纤维重复性和纤维间重现性分别小于12%和18%（n = 5）。PTh纤维用于监测实际水样中的OCPs，结果与市售的聚乙二醇/二乙烯基苯（CW/DVB）纤维测定的数据相比具有优势。
