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Changes in Composition of Nitrogen-15-Labeled Gases during Storage in Septum-Capped Vials

Ronald J. Laughlin and R. James Stevens*

Dep. of Agriculture and Rural Development, Agricultural and Environmental Science Division, Newforge Lane, Belfast BT9 5PX, UK



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  		Fig. 1. The effect of storage time in Exetainers on (a) the concentration of nitrous oxide in a test mixture, (b) the concentration of nitrous oxide in a standard gas mixture, and (c) the enrichment of the labeled nitrous oxide (aD) in the test mixture. (LSD values are for comparing any two means at P = 0.05).

 


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  		Fig. 2. The relationship between the nitrous oxide concentration in an Exetainers and diffusive loss as predicted from Fick's Law.

 


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  		Fig. 3. The effect of storage time in Exetainers on the measured values of (a) {Delta}29R and (b) {Delta}30R in dinitrogen. (LSD values are for comparing any two means at P = 0.05).

 


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  		Fig. 4. The effect of storage time in Exetainers on the values of (a) the fraction of the 15N-labeled dinitrogen (d), and (b) the enrichment of the labeled dinitrogen (15XN) calculated from the measured values of {Delta}29R and {Delta}30R. (LSD values are for comparing any two means at P = 0.05).

 




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