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Some Useful Techniques and Accessories for Adaptation of the Gas Chromatograph to Soil Nitrogen Studies¹

ABSTRACT

Sample-handling procedures and certain modifications or accessories for the gas chromatograph that have been found useful in examining soil atmospheres for gaseous forms of nitrogen are described. Also described are columns and techniques that permit the separation and measurement of molecular N, N₂O, NO, NO₂, NH₃, O₂ and CO₂. A special gas sampling valve, a manifold assembly, a multiple selector valve and a needle and manometer arrangement are diagrammed.

¹ Contribution from The Nitrogen Laboratory, Western Soil and Water Management Research Branch, SWCRD, ARS, USDA, Fort Collins, Colo., in cooperation with the Colorado Agri. Exp. Sta. Scientific Journal Series 610.

² Soil Scientist and Microbiologist, respectively. The work reported was done during a 6 months' sabbatical leave of the senior author from the Pineapple Research Institute, Honolulu, Hawaii, and is published with the approval of the Director as Technical Paper No. 256.

Received for publication June 26, 1959. Accepted for publication August 11, 1959.