This study established a method for the determination of 2, 4-dichlorophenol , 2, 4, 6-trichlorophenol and pentachlorophenol by headspace solid-phase microextraction coupled with gas chromatography .The results showed that the best extraction efficiency was obtained when using polyacrylate ( PA,85 μm) as the extraction fiber , and the test solution stirred at 250 r/min for 50 min at 80 ℃with the addition of 0.3 mL of 0.1 mol/L H2 SO4 and 1.5 g Na2 SO4 for adjusting the pH and ionic strength of the test solution, respectively.The optimal desorption time was 5 min.Under the optimum conditions , the three compounds showed good linearity in the range of 0.1~10 000 μg/L and the correlation coefficients(R2) were all over 0.999.The detection limits were in the range of 0.023-0.11 g/L.The recoveries of spiked samples were between 82.5% and 101.7%.The extraction process in this method is free of organic reagents , and is green , simple and highly sensitive , which is applicable for trace and batch determination of chlorophenol compounds in surface water , groundwater and other environmental water samples .%建立了水中2,4-二氯酚、2,4,6-三氯酚和五氯酚的顶空固相微萃取-气相色谱分析方法. 研究确定以聚丙烯酸酯( PA,85 μm)为萃取头,加入0.3 mL质量浓度为0.1 mol/L的H2 SO4 溶液和1.5 g的Na2 SO4 调节待测液的pH值和离子强度,萃取温度为80℃,萃取时间为50 min,搅拌速率为250 r/min时萃取效果最好;最佳解吸时间为5 min. 在该优化条件下,3种物质在0.1~10 000 μg/L范围内线性良好,相关系数R2 均>0.999,检出限为0.023~0.13 μg/L,实际样品的加标回收率为82.5%~101.7%. 该方法萃取过程不需有机溶剂,绿色、简便,且具有较高的灵敏度,适用于地表水、地下水等环境水样中氯酚类化合物的痕量检测与批量分析.
展开▼
