【摘要】 为适应地表径流中多环芳烃分析的需要,研究了一种以中空纤维膜液相微萃取取代传统固相萃取作为提取手段的新型地表径流多环芳烃分析方法.通过实验确定最佳的萃取条件为:以甲苯为萃取剂,在温度35℃,搅拌速率700 r·min-1,盐浓度30 g·L-1条件下萃取10 min.萃取完成后,使用安捷伦气质联用仪进行测定.在上述条件下,16种多环芳烃的回收率范围在52.21%—128.09%之间,相对标准偏差大部分均在0—10%以内,个别超出10%,检测限均低于2μg·L-1.实际检测结果经与固相萃取比较基本一致.该方法可有效地克服地表径流多环芳烃分析中的采样难题,并获得令人满意的检测结果.更多还原

【Abstract】 A novel method replacing classic solid phase extraction with hollow fiber-protected liquid phase microextraction( HF-LPME) was developed to meet the requirements of efficient measurement of polycyclic aromatic hydrocarbons( PAHs) in surface runoffs. The optimal conditions of 10 min extraction were proposed as below: 1) toluene was selected as extractant; 2) the temperature was 35 ℃; 3) stirring rate was700 r·min- 1; 4) salt concentration was 30 g·L- 1. After extraction,samples were injected into an Agilent gas chromatography-mass spectrometry( GC-MS) for qualitative and quantitative detection. Under the above conditions,the range of recovery rates of 16 PAHs were between 52. 21% —128. 09%. Most of the relative standard deviations( RSD) were 0—10%,although a few were more than 10%. Moreover,limits of detection( LOD) were lower than 2 μg·L- 1. The analysis of real emvironmental samples indicated that the new method using HF-LPME is highly comparable to those using solid phase extraction. This study provided a useful method to overcome the difficulties of PAHs sampling in surface runoffs,and obtained satisfactory results.更多还原