异烟酸铜磁力搅拌微固相萃取-气相色谱法测定土壤中多环芳烃

建立了膜保护异烟酸铜微固相萃取的样品前处理方法，并采用气相色谱氢火焰离子化检测器对土壤中的痕量荧蒽(Flt)、苯并［b］荧蒽(BbF)、苯并［k］荧蒽(BkF)、苯并［a］芘(BaP)进行了测定. 考察了水温、萃取时间和超声洗脱时间等对萃取效果的影响. 结果表明:在最佳试验条件下，Flt的检出限为1.0 ng/g；BbF，BkF和BaP的检出限为2.5 ng/g. Flt的线性范围为2.5～500.0 ng/g；BbF，BkF和BaP的线性范围均为12.5～500.0 ng/g. 相对标准偏差(RSD)为4.4%～13.7%(n9). 采用该方法分析了2种实际土壤中的4种多环芳烃，回收率为34%～90%. 

Determination of PAHs in Soil Using Micro-Solid Phase Extraction Couple with Gas Chromatography with Copper Isonicotinate as Sorbent

A new extraction procedure involving magnetic stirring and micro-solid phase extraction (μSPE) using copper isonicotinate as sorbent was developed for the analysis of fluoranthene (Flt), benzo[b]fluoranthene (BbF), benzo[k]fluoranthene (BkF) and benzo[a]pyrene (BaP) in soil samples using GC-FID. Influences of extraction temperature, extraction time and ultrasonic desorption time on extraction efficiencies were investigated. Under the optimized experimental conditions, the limits of detection of this method were 1.0 ng/g for Flt, and 2.5 ng/g for BbF, BkF, and BaP. The linear ranges were from 2.5 to 500.0 ng/g for Flt, and 12.5 to 500.0 ng/g for BbF, BkF, and BaP. The relative standard deviations (n=9) for all compounds varied from 4.4% to 13.7%. Two field contaminated soils were analyzed using the new method, and the recoveries were between 34% and 90%.