title: Application of ceramic/carbon composite as a novel coating for solid-phase microextraction.
abstract: A ceramic/carbon composite was developed and applied as a novel coating for solid-phase microextraction (SPME). The ceramic/carbon coating exhibited several good properties for SPME, such as high extraction quantities and enhanced thermal and organic solvent stability. Under scanning electron microscopy (SEM), the tightly attached coating layer on stainless steel wire revealed excellent mechanical characteristics. Single fiber and fiber-to-fiber reproducibility were less than 6.9 and 9.5%, respectively. The effects of extraction and desorption parameters such as extraction time, stirring rate, ionic strength, and desorption temperature and desorption time on the extraction/desorption efficiency were investigated and optimized. Coupled to gas chromatography with a flame thermionic detector, the optimized SPME method was applied to the analysis of organophosphorus pesticides (OPPs) in aqueous samples. The calibration curves were linear from 0.05 to 200 ng mL(-1) for fenchlorphos, pirimiphos-methyl, chlorpyrifos, ethion and from 0.2 to 200 ng mL(-1) for quinalphos, and the limits of detection were between 5.2 and 34.6 ng L(-1). The recovery of the OPPs spiked in real water samples at 5 ng mL(-1) ranged from 86.2 to 103.4% and the relative standard deviations were less than 8.5%.
authors: Department of Chemistry and the Key Laboratory of Analytical Sciences of the Ministry of Education, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
authors: Jingbin
authors: J
authors: Zeng
authors: Binbin
authors: B
authors: Yu
authors: Wenfeng
authors: W
authors: Chen
authors: Zhijie
authors: Z
authors: Lin
authors: Limei
authors: L
authors: Zhang
authors: Zequan
authors: Z
authors: Lin
authors: Xi
authors: X
authors: Chen
authors: Xiaoru
authors: X
authors: Wang
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D007202:Indicators and Reagents; D009943:Organophosphorus Compounds / Q000737:chemistry / Q000302:isolation & purification; D010575:Pesticides / Q000737:chemistry / Q000302:isolation & purification; D016062:Porosity; D017640:Silicates / Q000737:chemistry; D052617:Solid Phase Microextraction / Q000379:methods*; D013314:Stress, Mechanical
chemical_list: D007202:Indicators and Reagents; D009943:Organophosphorus Compounds; D010575:Pesticides; D017640:Silicates; D002244:Carbon