自制固相微萃取涂层用于自来水中五氯酚的测定

采用石英毛细管作为模具,甲基丙烯酸和乙二醇二甲基丙烯酸酯在石英纤维表面原位聚合得到聚(甲基丙烯酸-乙二醇二甲基丙烯酸酯)作为固相微萃取涂层,并以五氯酚为研究对象,采用顶空SPME-GC-ECD法对该涂层的萃取性能进行评价。使用正交试验优化萃取温度、萃取时间、盐浓度、pH和搅拌速度。在最优条件下,建立了水样中五氯酚的分析方法,方法检出限为1ng/L,线性范围为2～5000ng/L,线性相关系数为0.9999,相对标准偏差(RSD,n=5)为8.9%,加标回收率为110.8%。

Analysis of Pentachlorophenol in Tap water by using home-made solid phase microextraction coating

A novel and simple method for preparation of a novel SPME fiber was proposed by copolymerizatiort of methacrylie acid （MAA） and ethylene glycol dimethacrylate （EGDMA） by using glass capillary as ＂mold＂. Pentachlorophenol as target analyte was used to evaluate the extraction performance of home-made coating. Experimental headspace-SPME （HS-SPME） parameters were investigated and optimized by orthogonal array experimental designs. The analytical method for determination of pentachlorophenol was established in tap water sample under the optimum conditions with the method detection limit 1 ng t-1 linear range 2 -5 000 ng L-1 , correlation coefficients 0.999 9, relative standard deviation 8.9% （RSD, n = 5） and the recoveries of spiked tap water sample 110.8%.