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Gas Chromatographic Analysis of Soil Atmospheres¹

ABSTRACT

A gas chromatographic procedure is described that permits rapid, specific, and precise determination of N₂, O₂, Ar, CO₂, CH₄, N₂O, and other gases in soil atmospheres. It involves use of an ultrasonic detector and two columns of Porapak Q at different temperatures, and it does not require temperature programming, column conditioning, stream splitting, column switching, or switching of recorder polarity. Unlike thermal conductivity and helium ionization detectors previously used for gas chromatographic analysis of soil atmospheres, the ultrasonic detector is not adversely affected by gases found in soil atmospheres and permits determination of these gases at concentrations ranging from <10 ng/ml to 100%.

¹ Journal Paper no. J-8734 of the Iowa Agric. Home Econ. Exp. Stn., Ames. Project 2096. Presented before Div. S-3, Soil Sci. Soc. Am., Houston, Texas, 2 Dec. 1976. This work was supported in part by the Rockefeller Foundation and by the U.S. Energy Research and Development Administration under contract E(11-1)-2530.

² Predoctoral Research Associate and Professor, respectively, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011.

Received for publication January 24, 1977. Accepted for publication April 25, 1977.