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The Influence of Anion Mobility on Ionic Retention in Waste Water-irrigated Soils¹

ABSTRACT

The concept of anion mobility as a determinant of soil leaching rate was illustrated in a waste water irrigation study. Anion adsorption appeared to affect the leaching of H₂PO₄^– and SO₄^2-, but not Cl^–, which percolated freely through the soil. The mobility of NO₃^– was primarily regulated by nitrification and plant uptake. The most pronounced change in solution chemistry was an alkalinity decrease of approximately 80% as waste water entered the soil due to lowering of pH (7.5 to ca. 6.5), and to gaseous CO₂ loss from solution. This alkalinity decrease accounted for most of the total ionic retention in the soil which ranged from 40–60% of waste water input.

Key Words: forest soil • ion movement • adsorption • pH • irrigation

¹ Contribution from the Center for Ecosystems Studies, College of Forest Resour., Univ. of Washington. Pub. no. 1272, Environ. Sci. Div., Oak Ridge Natl. Lab. Financial support from the Corps of Engineers, U.S. Army Cold Regions Res. and Eng. Lab., Hanover, N.H., through contract no. DACW73-73-C-0076, and the Municipality of Metropolitan Seattle (METRO) through contract no. CR2385.

² Postdoctoral Fellow, Research Assistant, and Professor, respectively, College of Forest Resour., Univ. of Washington, Seattle, WA 98195. Current address of senior author is Environ. Sci. Div., Oak Ridge Natl. Lab., Oak Ridge, TN 37830. Oak Ridge Natl. Lab. operated by Union Carbide Corp. under contract W-7405-eng-26 with the U.S. Dep. of Energy.

Received for publication March 1, 1978.