Solid-phase extraction on C18 in the trace determination of selected polychlorinated biphenyls in milk.
The utility of solid-phase extraction with octadecylsilica for determining fifteen polychlorinated biphenyl (PCB) congeners from milk samples was examined. Recoveries higher than 80% and relative standard deviations better than 10% were obtained for PCBs from different kinds of milk (whole, skimmed, 2%, powdered, breast and evaporated). A comparison with other procedures was made. The described method provides better detection limits than those attainable with the liquid-liquid extractions currently used as standard methods, when capillary gas-liquid chromatography is used for the final determination. A study of the separation was also performed using six different fused-silica capillary columns and an electron-capture detector.
Picó
Y
Y
Laboratori de Toxicologia, Facultat de Farmàcia, Universitat de València, Spain.
Redondo
M J
MJ
Font
G
G
Mañes
J
J
D000818:Animals; D002849:Chromatography, Gas / Q000379:methods*; D008892:Milk / Q000737:chemistry*; D008895:Milk, Human / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000032:analysis*
D011078:Polychlorinated Biphenyls