Pyrethroid insecticides may persist in the environment and kill estuarine amphipods. - GreenMedInfo Summary
Analysis, occurrence, and toxic potential of pyrethroids, and fipronil in sediments from an urban estuary.
Environ Toxicol Chem. 2010 Apr;29(4):843-51. PMID: 20821513
Southern California Coastal Water Research Project, 3535 Harbor Boulevard Suite 110, Costa Mesa, California 92626, USA.
Eight pyrethroids and fipronil and its three major degradates were analyzed in urban estuarine sediments that exhibited a range of toxic effects to an amphipod test species. Sediments from Ballona Creek, an urban estuary in Southern California (USA), collected during three dry season events were analyzed by gas chromatography with electron capture and negative chemical ionization mass spectrometric detection (GC-ECD and GC-NCI-MS). The two detection methods were in agreement for intermediate levels of pyrethroid contamination (10-50 ng/g dry wt) but deviated for both low and high concentrations (<5 and>50 ng/g). Sediments contained total pyrethroids as high as 473 ng/g with permethrin, bifenthrin, and cypermethrin as the most abundant compounds. In contrast, fipronil and its desulfinyl, sulfide, and sulfone degradates were detected at much lower levels (