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The application of a technique combining thermogravimetry and atmospheric pressure chemical ionization mass spectrometry is shown for selected analytical problems encountered by the Research Division of the U.S. Customs Service. These include the compositional analysis of a fabricated object, the detection of a benzenoid containing compound in a complex matrix, the compositional analysis of styrene-butadiene rubber blends, the differentiation between the natural and chemically modified forms of a natural product, and finally, the determination of country of origin of another natural product. In each of these cases, the combination of the two techniques provided the information necessary to address the analytical problem.
thermogravimetry (TG), atmospheric pressure chemical ionization mass spectrometry (APCIMS), guar gums, dry inks, styrene-butadiene blends, coffee beans
Research chemist, U.S. Customs Service, Washington, DC