GC Determination of Residual Organic Solvents in Food Packaging Materials with Solid Phase Microextraction

Gas chromatography with hydrogen flame ionization detection (FID) was used in the determination of residual amounts of 15 kinds of commonly used organic solvents (including arenes,alcohols,ketones,esters and etc.).Solid phase microextraction (SPME) was used to enrich trace amounts of the residual solvents,and poly dimethyl sulfoxide was used as extraction phase in the SPME.The sample together with trichloromethane as internal standard was equilibriated in the head-space bottle and introduced into the GC instrument for analysis.The DB-624 capillary column was chosen for separation of the organic solvents.Under the optimum conditions,the 15 solvents were separated satisfactorily within 20 min.Values of lower limit of determination (10S/N) found were in the range of 0.08-0.69 μg·dm-2.Tests for recovery were made by standard addition method,the results of recovery obtained were ranged from 60.0% to 115.0%,with values of RSD′s (n=5) in the range of 2.17%-8.34%.