Chapter 18

Chapter 18 - Soils and Environmental Pollution Organic...

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Soils and Environmental Pollution Leaching Organic Chemicals Some wind up in soil, intentionally or not, and have possible adverse effects on water quality and soil organisms. Fate in the Soil Environment Volatilization Affected by soil hydraulic properties. Leaching is greater in highly permeable soils. However, leaching is affected by degradation and sorption. Runoff Sorption Solution Solids Soil properties that favor infiltration limit run- off. Refers to the distribution of a substance between soil solids and solution. The rate of movement in soil (dissolved in the soil solution) decreases as extent of sorption increases. Extent of sorption is determined by chemical properties of organic solute and soil solids. For example, sorption is very high for cations like the herbicide paraquat but low for the anionic herbicide 2,4-D. In general, sorption is high for hydrophobic solutes if there is a lot of soil organic matter.
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This note was uploaded on 01/08/2012 for the course AGRO 2051 taught by Professor Gaston during the Fall '08 term at LSU.

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Chapter 18 - Soils and Environmental Pollution Organic...

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