Determination of total carbon and total organic carbon from volatile air pollutants. Part III

Kozlowski, E.; Namieśnik, Jacek

doi:10.1007/bf01197515

Cited by 2 publications

(2 citation statements)

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“…Total organic carbon, or the carbon content of the atmosphere from all organic compounds, is an important parameter used to determine air pollution (12,13). Generally, the concentration of organic compounds in the atmosphere falls in the parts per million (ppm) or millitorr range at most.…”

Section: Measurement Of Low Vapor Pressuresmentioning

confidence: 99%

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Measurement of low vapor pressures : a kinetic approach

Bliden¹

2000

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A kinetic model was applied to vapor pressure data obtained by a variable flow method. The vapor pressures of benzoic acid, naphthalene, benzophenone, and phenylhydrazine were measured at temperatures of 293K to 307K. The data are summarized in the data table on the following page. These data were obtained by passing air over a sample of the substance in a tube. The air stream was combusted, and a flame ionization detector was used to measure the mass of co 2 so obtained. Several different flow rates were used at each temperature with each substance. A calibration factor was determined for peak heights generated by the signal from the detector on a strip chart recorder, by the use of a standard sample of CO. Thereby, the pressure readings at flow rates varying from 0 to 60 cc/min. for a given substance at a particular temperature were plotted as l/vapor pressure vs. flow rate. The extrapolated pressure at zero flow was treated by equation (1) to yield the saturated vapor pressure of the substance at the trial temperature.(l} vapor pressure= l/(y-intercept)/# carbon atoms in the substance.This relationship was derived from a kinetic treatment of an exponential dilution model.

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Section: Measurement Of Low Vapor Pressuresmentioning

confidence: 99%