Influence of Solid Phase Extraction Sorbents on Extraction Efficiency of Aliphatic Dicarboxylate Esters Plasticizer in Water
Taking the inspection method of 11 aliphatic dicarboxylate esters plasticizers in water by the solid phase extraction-gas chromatography-mass spectrometry(SPE-GC-MS)as an example,the effects of different brands,batches of SPE sorbents,C18 column and the corresponding ratio of eluting solvents on the extraction efficiency of water samples with C18 column and HLB column were discussed.The results showed that n-hexane could not be used as the wash solvent of C18 columns and HLB columns.The optimum dichloromethane content ratios of dichloromethane/n-hexane eluting solvent system for 11 ADEs with different SPE sorbents of C18 column and HLB were 0-60%and 15%-20%respectively.C18 column without capping treatment was not suitable for SPE of ADEs.The optimal solvent elution volume was 5 mL,and the sample breakthrough volume was at least 200 mL.Under the optimized conditions,the method detection limits(MDLs)of the 11 ADEs methods were 0.2-0.5 μg/L,the recoveries of spiked actual water sample were 85.2%-113%,and the relative standard deviations(RSDs)of the parallel samples were 5.5%-18%,which indicating that the proposed method was efficient,accurate and sensitive.
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