title: Determination of fatty acids in soil samples by gas chromatography with mass spectrometry coupled with headspace solid-phase microextraction using a homemade sol-gel fiber.
abstract: Through the use of a homemade sol-gel-derived fiber, a headspace solid-phase microextraction technique coupled to gas chromatography with mass spectrometry was developed for the determination of fatty acids with long, even-numbered carbon chains (C12 -C24 ) in soil samples. The experimental parameters such as reaction time, temperature, and ionic strength that might affect derivatization, extraction, and desorption were investigated. Under the optimized conditions, the linearity of the method ranged from 0.1 to 100 mg/L with a correlation coefficient >0.997. The limit of detection values based on a signal-to-noise ratio of 3:1 were determined with the concentration from 0.39 to 39.4 μg/L. The recoveries of the method for the soil samples were from 91.15 to 108.1%. This developed method using a homemade fiber showed a higher sensitivity than that using a commercial polydimethylsiloxane fiber and was also for the analysis of real soil samples from the Paomaling geological park of China.
authors.affiliation: Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan, P. R. China; Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, P.R. China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Shuai
authors.forename: Xiaoxiao
authors.initials: X
authors.lastname: Ding
authors.forename: Yunjie
authors.initials: Y
authors.lastname: Huang
authors.forename: Shuangshuang
authors.initials: S
authors.lastname: Xu
authors.forename: Shengrui
authors.initials: S
authors.lastname: Xu
authors.forename: Qiang
authors.initials: Q
authors.lastname: Gao
authors.forename: Haidong
authors.initials: H
authors.lastname: Deng
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002681:China; D002849:Chromatography, Gas; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D005227:Fatty Acids / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D007477:Ions; D057230:Limit of Detection; D044367:Phase Transition; D015203:Reproducibility of Results; D059629:Signal-To-Noise Ratio; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D052617:Solid Phase Microextraction; D013696:Temperature
chemical_list: D004129:Dimethylpolysiloxanes; D005227:Fatty Acids; D007477:Ions; D012987:Soil; D012989:Soil Pollutants; C013830:baysilon; D002244:Carbon
keywords: Fatty acids; Gas chromatography with mass spectrometry; Soil; Solid-phase microextraction