HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Guenzi, W. D. Articles by Beard, W. E. Search for Related Content PubMed Articles by Guenzi, W. D. Articles by Beard, W. E. Agricola Articles by Guenzi, W. D. Articles by Beard, W. E.

Apparatus for Sampling and Controlling Gas Composition in Redox-Controlled Soil Slurry

USDA-ARS, Northern Plains Area, P.O. Box E., Fort Collins, CO 80522

*Corresponding author.

ABSTRACT

Study of the production or consumption in soil of gaseous N compounds at near ambient concentrations requires unique apparatus and procedures. We used a soil slurry that is continuously flushed by a gas stream with controlled composition. Basic components of the system include a reaction chamber equipped to monitor and control slurry pH, E_h, and temperature, flow controllers for precise control of gas flow rates, a mixing chamber for blending inlet gases from different sources, a low-volume manifold for collecting contamination-free samples of inlet and exit gases, a dryer to selectively remove water vapor from the exit gases, and a large-volume sample loop for collecting enough sample gas for NO analysis. The E_h control was accomplished using automated three-way solenoid valves to select either O₂ or an equal flow of inert gas to mix with the gas stream flushing the reaction chamber. Although the gas sampling and gas handling apparatus and procedures described here were designed for an E_h-controlled soil slurry, we believe they could be easily adapted to other experimental systems that require trace gas sampling and control without contamination from ambient air.

Received for publication November 18, 1988.

This article has been cited by other articles:

				M. J. Herbel, D. L. Suarez, S. Goldberg, and S. Gao Evaluation of Chemical Amendments for pH and Redox Stabilization in Aqueous Suspensions of Three California Soils Soil Sci. Soc. Am. J., May 16, 2007; 71(3): 927 - 939. [Abstract] [Full Text] [PDF]