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%.