Identification and Estimation of the Major Components of a Commercial Polychlorinated Biphenyl Mixture, Aroclor 1221

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Abstract
The major components of Aroclor® 1221, a polychlorinated biphenyl mixture, have been tentatively identified as the following (weight % composition of each component is given in parentheses): biphenyl (12.7), 2-chlorobiphenyl (28.4), 4-chlorobiphenyl (18.7), 2,2′-dichlorobiphenyl (9.2), 2,4-dichlorobiphenyl (3.5), 2,4′-dichlorobiphenyl (13.6), and 4,4′-dichlorobiphenyl (6.2).