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A proton transfer reaction mass spectrometry (PTR-MS) system has been developed which allows for on-line measurements of trace gas components with concentrations as low as 1 ppb. The method is based on reactions of ions, which perform non-dissociative proton transfer to most of the common organic trace constituents but do not react with any of the components present in clean air. Examples of medical applications by means of breath analysis, examples of environmental trace gas analysis and examples in the field of food chemistry demonstrate the wide applicability of the method.
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Lindinger et al. (1997) studied this question.
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