16) Wagman, D. D.; Evans, W. H.; Parker, V. B.; Schumm, R. H.; Halow, I.; Balley, S. M.; Churney, K. L.; Nuttall, R. L. Unger, S. E.; Vlntze, A.; Cooks, R. G.; Keough, T. J . Am. Chem. Soc. 1982. 104. 1507. A' Int' J ' 147-159. Inchaouh, J.; Blais, J. C:; Bolbach, B.; Brunot, A. Znt. J . Mass Spectrom. Ion Processes 1984, 6 1 , 153. Sunner, J. A.: Kulatunga, R.; Kebarle, P. Anal. Chem. 1986, 5 8 , 1312-1316.Michl, J. I n t . PCBs were not specifically identified, this GC/MS approach provided other valuable information, including the relative retention time, relative abundance, and level of chlorination of the congener(s) represented by each GC peak. Acquired data were used to identify and measure Aroclors in two solutions, one containing four Aroclor mixtures and one containing seven Aroclor mixtures.
EXPERIMENTAL SECTION
Materials.The nine PCB calibration congeners were obtained from Ultra Scientific, Hope, RI, and were used without purification. The internal standard, chrysene-d,,, was obtained from Aldrich Chemical Co., Milwaukee, WI. A single-component solution of each of the nine PCB concentration calibration congeners This article not subject to US.