Title: Determination of Pyrethroids in Sediment Water Using Triple Quadrupole GC/MS/MS

This section method (SM) documents a selective pyrethroid analysis in sediment water and is followed by all authorized EMON personnel. This method uses the triple quadrupole to improve sensitivity and enables the lowering of the reporting limit over the previous method which used the ECD and MSD. 2. Principle: The SM describes the method for determination of resmethrin, bifenthrin, fenpropathrin, lambda cyhalothrin epimer, lambda cyhalothrin, permethin cis, permethrin trans, cyfluthrin, cypermethrin, fenvalerate / esfenvalerate and deltamethrin in sediment water. The pyrethroids are extracted from the sediment water using liquid-liquid extraction with hexane. The extracts are concentrated and then cleaned up with florisil before being analyzed with a gas chromatography equipped with triple quadrupole detector. The reporting limit is 10 ppt for resmethrin, 2 ppt for bifenthrin and 5 ppt for all the rest of the compounds. 3. Safety: 3.1 All general laboratory safety rules for sample preparation and analysis shall be followed. 3.2 Hexane is a flammable and toxic solvent; it should be handled with care in a ventilated area. 4. Interferences: There were no interferences at the time of validation for the background water provided