PCBs Regulatory History and
Analytical ProblemsSynthesis of polychlorinated biphenyls (PCBs) was first described by Schmidt and Schultz (i) in 1881, but the industrial application of that discovery was not fully developed until 50 years later by the Swan Corporation. Commercial introduction of PCBs as industrial chemicals for use as nonflammable oils, notably in connection with electrical transformers, condensers, and paint, was begun in 1930. Chlorination of the parent moiety, biphenyl, results in a series of
Analytical difficulties involved in the detection of a wide range of suspected polar and nonpolar drugs in botanical matrices have been solved by adopting a multipronged approach. Preliminary screening of Chinese herbal medications can be accomplished by a combination of thin-layer chromatography and gas chromatography/mass spectrometry and/or the employment of liquid chromatography/mass spectrometry as a probe introduction technique.
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