γ-Al_2O_3固相微萃取涂层的制备及其在水体和气态基质中的应用  

Preparation of a Solid-Phase Microextraction Fiber Coated with γ-Al_2O_3 and Determination of Volatile Organic Compounds in Aqueous and Gaseous Samples

作　　者：魏黎明[1] 李菊白[1] 王国俊[1] 欧庆瑜[1] 

机构地区：[1]中国科学院兰州化学物理研究所甘肃省天然药物重点实验室,甘肃兰州730000

出　　处：《色谱》2004年第4期435-438,共4页Chinese Journal of Chromatography

摘　　要：采用物理涂渍的方法制备了γ Al2 O3 固相微萃取涂层。通过γ Al2 O3 固相微萃取 (SPME) 气相色谱 (GC)联用技术 ,对水中痕量苯系物苯、甲苯、乙苯、二甲苯异构体 (BTEXs)进行萃取分析 ,结果表明该涂层具有热稳定性强 (最高使用温度可达 35 0℃ )、灵敏度高 (检测限为 1～ 10 μg/L)以及制备重复性好 (相对标准偏差为 8 3% )的特点 ;同时该涂层对气态基质中的污染物亦可进行萃取分析。A method for the preparation of a novel γ-Al_2O_3 coated layer on fibers for solid-phase microextraction (SPME) was developed. The adsorption and desorption properties of the coated fibers were studied by the extraction of some volatile organic compounds such as benzene, toluene, ethylbenzene and xylene isomers (BTEXs) from aqueous samples. The calibration graphs were linear in the range 0.01 (mg/L) to 3 (mg/L) and the detection limits for BTEX compounds were between 1 (μg/L) and 10 (μg/L). Also the γ-Al_2O_3 coated fibers exhibited a good thermal stability (to 350 ℃) and reproducibility with relative standard deviation of 8.3%. It can be used to determine organic compounds in the real gaseous samples.

关 键 词：固相微萃取 三氧化二铝涂层 水体基质 气态基质 挥发性有机物 痕量苯系物 

分 类 号：O658[理学—分析化学]