Application Of MSPE-GC-MS/MS To The Analysis Of Benzenes Pollutants In Environmental Water Samples

Firstly,an ultrasound-assisted magnetic solid-phase extraction procedure with chloromethylated polystyrene-coated Fe₃O₄ nanospheres?CMPNs?as magnetic adsorbents has been developed to determine seven nitrobenzenes in environmental water samples,in combination with gas chromatography coupled to tandem mass spectrometry for the first time.Several factors related to magnetic solid-phase extraction efficiencies,such as the species and amount of magnetic adsorbent,extracting time,the concentration of salt and desorption conditions were investigated.A good linearity was observed in the range of 0.2⁴ ?g·L-1 for all the seven compounds with correlation coefficients ranging from 0.9942 to 0.9994.The limits of detection for the seven nitrobenzenes ranged from 0.006 to 0.022 ?g·L-1.The mean recoveries ranged from 72.3%¹13.5% with coefficients of variations in the range of0.5%⁵.8%.Attributed to the convenient magnetic separation,the proposed method is suitable for the rapid analysis of nitrobenzenes in environmental water samples.Secondly,ionic liquid coated magnetic nanoparticles?Fe₃O₄/PS[im-Cn]Cl n=1,4,6,10?have been prepared by covalent immobilization,the as-synthesized magnetic nanoparticles have been used as adsorbents for the extraction of six phenols from environmental water samples,in combination with GC-MS/MS.Several significant factors that affect the extraction efficiency,such as the kinds of magnetic nanoparticle,magnetic nanoparticles amount,extraction time,solution pH,the concentration of NaCl,the kinds and volume of eluent were investigated.Under the optimized conditions,the LODs for six phenols were in the range of 0.001-0.003 ?g·L-1.And an excellent linearity was observed in the range of 0.01-5 ?g·L-1 for six phenols,with thecorrelation coefficients ranging from 0.9970 to 0.9998.This adsorbents could be recycled more than 4 times.The proposed method was demonstrated to be feasible,simple and easy to operate for the trace analysis of the phenols in environmental water samples.Finally,an ultrasound-assisted magnetic SPE procedure with the magnetic acidified graphene nanoparticles?Fe₃O₄@G-COOH?as the magnetic adsorbents have been developed to determine six phenols simultaneously in environmental water samples,in combination with GC-MS/MS.Several factors related to recoveries,such as the amount of magnetic adsorbent,extracting time,and desorption conditions.Under the optimized conditions,the LODs for six phenols were in the range of 0.002-0.006?g·L-1.And an excellent linearity was observed,with the correlation coefficients ranging from 0.9916-0.9996.The result shows that magnetic acidified graphene greatly increase the hydrophilicity and the good repeatiblity.In addition,this method could be extended to further development of structural modification with graphene.