2015
DOI: 10.1021/ac504351b
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Investigating Adsorption/Desorption of Carbon Dioxide in Aluminum Compressed Gas Cylinders

Abstract: Between June 2010 and June 2011, the National Institute of Standards and Technology (NIST) gravimetrically prepared a suite of 20 carbon dioxide (CO2) in air primary standard mixtures (PSMs). Ambient mole fraction levels were obtained through six levels of dilution beginning with pure (99.999%) CO2. The sixth level covered the ambient range from 355 to 404 μmol/mol. This level will be used to certify cylinder mixtures of compressed dry whole air from both the northern and southern hemispheres as NIST standard … Show more

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Cited by 22 publications
(53 citation statements)
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“…There has been much interest of late in the initial adsorption of carbon dioxide (CO 2 ) in air balance mixtures from the initial filling of a cylinder followed by desorption as the pressure in the cylinder is reduced, resulting in an increase in the mole fraction of CO 2 (Leuenberger et al, 2015;Miller et al, 2015). This adsorption/desorption can be modeled for different cylinder volumes using the Langmuir isotherm (Langmuir, 1916(Langmuir, , 1918.…”
Section: Stability As a Function Of Pressurementioning
confidence: 99%
“…There has been much interest of late in the initial adsorption of carbon dioxide (CO 2 ) in air balance mixtures from the initial filling of a cylinder followed by desorption as the pressure in the cylinder is reduced, resulting in an increase in the mole fraction of CO 2 (Leuenberger et al, 2015;Miller et al, 2015). This adsorption/desorption can be modeled for different cylinder volumes using the Langmuir isotherm (Langmuir, 1916(Langmuir, , 1918.…”
Section: Stability As a Function Of Pressurementioning
confidence: 99%
“…Despite this varying conditions both studies did not observe effects higher than 0.1 µmol mol −1 at low flow conditions for untreated aluminum cylinders. On the contrary, both studies have 20 shown effects at high flow condition which cannot be explained by adsorption theory alone.…”
Section: Discussionmentioning
confidence: 77%
“…The discrepancy between the last high temperature and first run after cleaning might be due to the steepness of the set temperature curve which might affect the mechanism of this enhancement process. However, the basic response remained unchanged, in which CO 2 , CH 4 and CO showed an increase in amount fraction 20 with decreasing intensity at each consecutive cycle, and that H 2 O showed a reversible behavior.…”
Section: 33mentioning
confidence: 94%
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“…In addition, research on the possible causes of the stability issues should be performed for the development of appropriate solutions. For example, the mole fractions might be affected by decreasing the pressure of the internal cylinder; therefore, changes in the mole fraction of nmol/mol level DMS in cylinders due to pressure reduction will be monitored.…”
Section: Resultsmentioning
confidence: 99%