GC-MS Determination of Aroclors in Soil with Rapid Solvent Extraction

7 Aroclors,namely Aroclor 1016,Aroclor 1221,Aroclor 1232,Aroclor 1242,Aroclor 1248,Aroclor 1254 and Aroclor 1260,in soil were determined by GC-MS under selective ion monitoring mode.The sample was extracted with n-hexane and acetone mixed in the ratio of 1 to 1 by rapid solvent extractor,and then partitioned with conc.H2SO4.The extract was purified by passing through florisil column.The eluate was concentrated and made up to 1 mL,which was used for GC-MS determination,with external standard method.Values of recovery were found in the range of 76%-108% with RSD′s (n=7) less than 13%.In application of the proposed method to the analysis of a CRM of soil,the relative error between the result obtained (2.19 mg·kg-1) and the certified value (2.14 mg·kg-1) was found to be 2.3%.Tests for recovery and precision were made by addition of standard solution of the substitute decachlorobiphenyl to a soil sample as matrix which was then analyzed by the proposed method.Values of recovery obtained were in the range of 70%-120%.