Rapid Extraction-Desorption of 7 Aromatic Compounds in Soil by Headspace Solid Phase Micro-extraction and Gas Chromatography
A rapid extraction and desorption strategy for the detection of seven volatile aromatic hy-drocarbons and their derivatives in soil has been developed utilizing a graphene oxide modified solid phase micro-extraction(GO@SPME)needle,in conjunction with gas chromatography(GC)coupled with a hydrogen flame ionization detector(FID).The target compounds include toluene,chloroben-zene,ethylbenzene,paraxylene,orthoxylene,nitrobenzene and naphthalene.The influence of seven factors(extraction liquid volume,stirring rate,extraction temperature,salt addition,desorp-tion temperature,extraction time and desorption time)on the extraction efficiency was systematically investigated to determine optimal experimental conditions.In the experimental process,we initially introduced deuterated toluene,which serves as an internal standard,to the soil sample to calibrate the systematic errors inherent in the analytical process.In addition,the organic compounds from the soil samples were extracted through methanol soaking,a step designed to separate the target com-pounds from the complex soil sample.Under optimal conditions,the target analytes were rapidly en-riched using headspace solid phase micro-extraction technology.Finally,the enriched samples were analyzed using GC-FID and internal standard quantification was achieved by constructing a calibra-tion curve,ensuring the precision and reliability of the analytical results.The findings indicate that rapid extraction and desorption are feasible within 15 seconds,with extraction taking 12 seconds and desorption requiring just 3 seconds.The linear relation of seven volatile aromatic hydrocarbons and their derivatives was good,with correlation coefficients(r2)not less than 0.998 9.The limits of de-tection(LODs,S/N=3)ranged from 1.71 to 11.60 μg/g,while the limits of quantification(LOQs,S/N=10)were from 5.70 to 38.67 μg/g.The average recoveries of the seven volatile aromatic hydro-carbons and their derivatives at three spiked levels of 60,120 and 180 μg/g,ranged from 87.3％to 109％.Concurrently,the relative standard deviations(RSDs)were not more than 12％.This method has simple and fast preprocessing,low cost,stable and reliable data,and is suitable for rapid de-tection of aromatic hydrocarbons in soil samples.
aromatic hydrocarbons and their derivativesgraphene oxideheadspace solid phase micro-extraction(HS-SPME)gas chromatographyrapid extraction-desorption strategysoil
万方数据
维普
