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Analysis of Semi-Volatile Compounds in Marine Sediment by GC/MS-MS
Oral Presentation
Prepared by G. Perez1, L. Litzi-Davis2
1 - City of Tacoma Environmental Services Laboratory, 326 E. D St., Tacoma, WA, 98421
2 - City of Tacoma Environmental Services Laboratory, 326 E. D St., Center for Urban Waters, Tacoma, WA, 98421
Contact Information: gregory.perez@cityoftacoma.org; 253-502-2135
ABSTRACT
Marine sediments can be among the most challenging matrices for semi-volatile analysis. Matrix effects can obscure low level analytes, while suppressing internal standard and surrogate recoveries. Reducing the sample size or diluting the extracts can reduce matrix effects. However, this often comes at the expense of meeting reporting limit requirements. Using large volume injection in conjunction with GC/MS-MS allows for smaller extraction amounts and/or higher dilutions without the loss of sensitivity or elevation of reporting limits. Tandem GC/MS-MS provides added sensitivity while filtering out background and increasing signal to noise ratios. GC/MS-MS also adds confidence to the identification of target analytes through compound specific precursor to product ion transitions.
This method is based on EPA SW-846 method 8270 and its goal is to meet challenging reporting limits as low as 5ug/Kg. This method will reduce sample amounts from 10g to 2g while meeting the project objectives.
Oral Presentation
Prepared by G. Perez1, L. Litzi-Davis2
1 - City of Tacoma Environmental Services Laboratory, 326 E. D St., Tacoma, WA, 98421
2 - City of Tacoma Environmental Services Laboratory, 326 E. D St., Center for Urban Waters, Tacoma, WA, 98421
Contact Information: gregory.perez@cityoftacoma.org; 253-502-2135
ABSTRACT
Marine sediments can be among the most challenging matrices for semi-volatile analysis. Matrix effects can obscure low level analytes, while suppressing internal standard and surrogate recoveries. Reducing the sample size or diluting the extracts can reduce matrix effects. However, this often comes at the expense of meeting reporting limit requirements. Using large volume injection in conjunction with GC/MS-MS allows for smaller extraction amounts and/or higher dilutions without the loss of sensitivity or elevation of reporting limits. Tandem GC/MS-MS provides added sensitivity while filtering out background and increasing signal to noise ratios. GC/MS-MS also adds confidence to the identification of target analytes through compound specific precursor to product ion transitions.
This method is based on EPA SW-846 method 8270 and its goal is to meet challenging reporting limits as low as 5ug/Kg. This method will reduce sample amounts from 10g to 2g while meeting the project objectives.