Analysis of Organochlorine Residues in Fish

摘要: The analyses of fish for organochlorine residues (OC pesticides, PCBs, PCTs) present some special cleanup problems due mainly to the difficulty removing coextracted oil. oil causes erratic elution patterns from many chromatographic column adsorbents. Our overall approach extraction, cleanup, pre-GLC separations and GLC analysis, as well quantitation PCBs are described. use deactivated Florisil in our procedure solved earlier problems, has given consistently excellent (less than 0.01 g remains 0.5 fat) recovery (above 90 percent) other biological tissues. adsorption is designed tolerate up or fat, but with initial Soxhlet an appropriate aliquot can be subjected cleanup. An additional step involving partitioning described coping much larger fat samples, especially where very low residue levels determined. PCB reference standards discussed. proposed a 1:1 mixture Aroclor 1254 1260 most samples preferred.