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- W122173055 abstract "The analytical system described here consists of a gas chromatograph, an atmospheric pressure ionization mass spectrometer designed for operation in the negative ion mode, and a computer. The gas stream from the gas chromatograph is split in order to obtain concurrent but separate detection with a standard electron capture detector and with the mass spectrometer. The ion source of the mass spectrometer is also a duplicate of the standard electron capture detector, so that simultaneous monitoring of the ions and monitoring of the electron capture detection response can also be carried out for the reaction chamber. Negative ions observed under atmospheric pressure ionization conditions are almost always anions of strong gas phase acids. These may be formed by reaction with a gas phase basic ion, or by electron capture reactions. A few organic compounds form stable radical M− ions. Most pesticides, herbicides and fungicides, as well as numerous toxic compounds that are now environmental hazards, form stable anions and show an electron capture response. Most ordinary organic compounds do not form stable negative ions at atmospheric pressure and do not show an electron capture response. The results suggest that an analytical system of this kind will be useful for the detection and quantification of many environmentally hazardous compounds." @default.
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- W122173055 date "1977-11-01" @default.
- W122173055 modified "2023-09-27" @default.
- W122173055 title "Atmospheric pressure ionization mass spectrometry" @default.
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- W122173055 doi "https://doi.org/10.1016/s0021-9673(01)92061-8" @default.
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