Adsorption of fuel odorants provides clue to fading. (General Developments).
The magnitude of these sorption processes was determined by measuring the heats of adsorption and interaction of the odorants on clay and organo-clay substrates. These substrates served as soil surrogates. The measurements were performed using a wall-coated, open-tubular (WCOT) column gas chromatographic technique developed by NIST researchers in Boulder. The researchers created clay stationary phases using the synthetic clay Laponite-RD. Subsequent coatings with an organic such as octadecane create an organo-clay stationary phase.
While the results to date include substrates representative of only two types of soil media, valuable insight into the magnitude of the odorant fading in soils is possible. Experimental results show that, as a class, the sulfide odorants have larger adsorption enthalpies on clay and organo-clay surfaces than the thiol odorants. As a result, the sulfides are more likely to be sequestered on soil surfaces. The difference in enthalpy values between the fuel gases and their respective odorants is valuable information from a utility operation standpoint.
CONTACT: Thomas J. Bruno, (303) 497-5158; firstname.lastname@example.org.
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|Publication:||Journal of Research of the National Institute of Standards and Technology|
|Article Type:||Brief Article|
|Date:||Jul 1, 2002|
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