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Elimination of matrix effects during analysis of perfluorinated acids in solid samples by liquid chromatography tandem mass spectrometry

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Journal of Central South University 2012年第10期19卷 2886-2894页

作者：李飞赵志领沈春花曾庆玲刘淑坡 College of Civil Engineering Huaqiao University

Matrix effects can significantly hamper the accuracy and precision of the analysis results of perfluorinated acids （PFAs） in environmental solid samples. Several methods, such as standard addition, isotopically labeled internal standards, clean-up of SPE （solid phase extraction） eluents by dispersive graphitized carbon sorbent and substitution of eletrospray ionization （ESI） source by atmosphere pressure photoionization （APPI） source, were demonstrated for elimination of matrix effects in quantitative analysis of PFAs in solid samples. The resuRs indicate that matrix effects can be effectively eliminated by standard addition, but instrumental analysis time will be multiplied. Isotopically labeled internal standards can effectively negate matrix effects of PFAs with the same perfluorocarbon chain length, but is not valid for the other analytes. Although APPI can eliminate matrix effects for all analytes, it is only suitable for analysis of high pollution levels samples. Clean-up of SPE eluents by dispersive graphitized carbon sorbent not only effectively negate the impact of matrix effect, but also avoid frequent clean of the ESI in order to maintain instrumental sensitivity. Therefore, the best method for elimination of matrix effects is the usage of dispersive graphitized carbon sorbent for clean-up of SPE elution.

关键词： matrix effects perfluorinated acids solid samples hydrophobic organic contaminants

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Effects of transient flow conditions on colloid-facilitated release of decabromodiphenyl ether:Implications for contaminant mobility at e-waste recycling sites

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Eco-Environment & Health 2024年第3期3卷 317-324页

作者： Yueyue Li Zebin Huo Yuqin Ying Lin Duan Chuanjia Jiang Wei Chen College of Environmental Science and Engineering Ministry of Education Key Laboratory of Pollution Processes and Environmental CriteriaTianjin Key Laboratory of Environmental Remediation and Pollution ControlNankai UniversityTianjin 300350China

Polybrominated diphenyl ethers(PBDEs)are ubiquitous contaminants,especially in the soil and groundwater of contaminated sites and ***,2,20,3,30,4,40,5,50,6,60-decabromodiphenyl ether(BDE-209),one of the most frequently and abundantly detected PBDE congeners in the environment,has recently been designated as a new pollutant subject to rigorous control in ***-facilitated transport is a key mechanism for the release of PBDEs from surface soils and their migration in the aquifer,but the effects of hydrodynamic conditions,particularly transient flow,on colloid-facilitated release of PBDEs are not well ***,we examined the effects of typical transient flow conditions on the release characteristics of colloids and BDE-209 from surface soil collected from an e-waste recycling site by undisturbed soil core leaching tests involving multiple dry–wet cycles(with different drying durations)and freeze–thaw *** observed significant positive correlations between BDE-209 and colloid concentrations in the leachate in both the dry–wet and freeze–thaw leaching experiments,highlighting the critical role of colloids in facilitating BDE-209 ***,colloids mobilized during the dry–wet cycles contained higher contents of BDE-209 than those in the freeze–thaw cycle tests,and the difference was primarily due to the more intensive disintegration of soil aggregates and elution of newly formed inorganic colloidal particles(mainly primary silicate minerals such as quartz and albite)with low BDE-209 content during the freeze–thaw *** findings underscore the necessity of considering transient flow conditions when assessing the fate and risks of PBDEs at contaminated sites.

关键词： hydrophobic organic contaminants Colloid-facilitated transport Dry-wet cycle Freeze-thaw cycle Undisturbed soil core

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