Method and apparatus for simultaneously measuring CO.sub.2, O.sub.2 and N.sub.2 dissolved in liquid
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United States of America Patent
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-
Oct 31, 2000
Grant Date -
N/A
app pub date -
Oct 17, 1994
filing date -
Oct 17, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for simultaneously measuring CO.sub.2, O.sub.2 and N.sub.2 gases dissolved in liquid includes a device for extracting the sample of gases from a container, such as a soft drink bottle, and a gas sample cell connected in fluid communication with the gas extracting device. The concentrations of CO.sub.2 and O.sub.2 gas in the gas sample are determined utilizing infrared (IR) absorption and phosphorescent quenching, respectively. The concentration of these respective gases is then converted to a partial pressure reading utilizing the temperature of the gas sample. The partial pressure of nitrogen gas in the sample is determined by measuring the total pressure of the gas sample and subtracting the partial pressures of the CO.sub.2 and O.sub.2 gas therefrom. The respective partial pressures of the CO.sub.2, O.sub.2 and N.sub.2 gases are then converted to concentration of those gases in the liquid sample in the soft drink bottle, as a function of their solubility values at the temperature of the gas sample.
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