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- W2495426242 endingPage "334" @default.
- W2495426242 startingPage "290" @default.
- W2495426242 abstract "This chapter provides an overview of mass analysis and partial pressure measurements and their applications. The mass analyzer section typically requires vacuum level below 10–5torr. The ion source region may operate at a pressure of one or two orders of magnitude higher than those using special designs, but still in a large number of cases some means of sample pressure reduction is necessary. The sample arriving into the ion source faces a fundamental change. Its electrical state is changed resulting in single- or multiple-charged ions, and fragmentation processes also take place. The vast majority of analyzers use the positive ions for separation because they are formed more easily. The ions leaving the analyzer have been separated from each other qualitatively, but their abundances need to be measured for quantitative analysis or just simple identification purposes. Air pollutant measurement may present a problem for gas chromatography when the composition of pollutants is unknown, which would require different columns, or detectors. A freezeout–thermal analysis mass spectrometric technique is capable of identifying impurities such as various freons and hydrocarbons at sub-ppm levels. Environmental characterization and monitoring of hazardous constituents in the field typically involves a gas chromatograph-mass spectrometer combination (GC-MS), where the GC is used for coarse separation and the MS for fine separation and detection." @default.
- W2495426242 created "2016-08-23" @default.
- W2495426242 creator A5076694611 @default.
- W2495426242 date "1998-01-01" @default.
- W2495426242 modified "2023-09-26" @default.
- W2495426242 title "Mass Analysis and Partial Pressure Measurements" @default.
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