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The Influence of Anion Mobility on Ionic Retention in Waste Water‐irrigated Soils
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1979
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Soil PropertyEnvironmental ChemistryEngineeringPlant UptakeEnvironmental EngineeringSoil ScienceAnion AdsorptionSoil ChemistryLeachingEnvironmental RemediationIonic RetentionLand DegradationAnion MobilityWaste ManagementWaste Water‐irrigated Soils
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 H 2 PO 4 − and SO 4 2‐ , but not Cl − , which percolated freely through the soil. The mobility of NO 3 − 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 CO 2 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.