COMPARISON OF A MATRIX SOLID-PHASE DISPERSION AND A CLASSICAL EXTRACTION METHOD FOR THE DETERMINATION OF CHLORINATED PESTICIDES IN FISH MUSCLE

A new multiresidue extraction technique was used to determine incurred chlorinated hydrocarbon pesticide residues in various fish species sa mpled at 2 locations along the Tensas River in Louisiana. Residue leve ls of total DDT (combined DDT, DDE, and DDD levels) in fish muscle fil lets from paired samples ranged from 0.2 to 3.9 ppm on a wet weight ba sis. These findings were compared to those of another laboratory that used a different protocol to isolate the residues from the fish muscle fillets. This latter protocol typifies the more complicated, time-con suming protocols used by governmental agencies for screening purposes. Results demonstrated that the new extraction technique reduced analys is time, solvent waste, and cost per sample without affecting the qual ity of residue detection and measurement.