title: Gas chromatographic determination of pentachlorophenol in gelatin: collaborative study.
abstract: Eleven collaborators participated in this study of a gas chromatographic method for the determination of pentachlorophenol (PCP) in gelatin. Following acid hydrolysis of a 2 g sample, PCP is extracted with hexane and partitioned into KOH solution. After reacidification, PCP is again extracted with hexane for determination by electron capture gas chromatography on a 1% SP-1240DA column. Three duplicate practice samples (0.0, 0.5, and 1.5 ppm) and 5 blind duplicate collaborative samples (0.0, 0.02, 0.1, 0.5, and 2.0 ppm) were analyzed by each collaborator. Mean recoveries of PCP in the collaborative samples ranged from 88% at the 0.02 ppm fortification level to 102% at the 0.1 ppm level; the overall mean recovery was 96%. Interlaboratory coefficients of variation ranged from 16.4% for the 0.1 ppm fortification level to 22.9% for the 0.5 ppm level; the overall interlaboratory coefficient of variation was 19.5%. The method has been adopted official first action.
mesh_terms: D002733:Chlorophenols / Q000032:analysis*; D002849:Chromatography, Gas; D005780:Gelatin / Q000032:analysis*; D007202:Indicators and Reagents; D010416:Pentachlorophenol / Q000032:analysis*
chemical_list: D002733:Chlorophenols; D007202:Indicators and Reagents; D005780:Gelatin; D010416:Pentachlorophenol