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Copper Adsorption by Soils Exposed to Desiccation Stress¹

ABSTRACT

Soils undergo substantial physical, chemical, and biological changes during the process of drying. Because soils are usually dried before their use in the laboratory, it is important to understand these changes if laboratory results are to be related to field conditions. The effects of air-drying (25°C) and over-drying (105°C) moist soils and the effects of remoistening air-dried and stored soils on copper adsorption are presented. Results indicate that oven-dried soils adsorbed 3 to 10% less copper than air-dried soils, which adsorbed 10% less than moist field soils. Remoistened samples, which were incubated for 1 month under aerated conditions, adsorbed an average of 12% more copper than air-dried and stored soils. Remoistened soils, which were incubated without aeration under a layer of water, showed no significant deviation from adsorption onto air-dried soils.

¹ Scientific Contribution no. 1220 from the New Hampshire Agric. Exp. Stn. This work was a part of Regional Research Project NE-96, "Soil Properties Affecting Sorption of Heavy Metals from Wastes."

² Former Graduate Research Assistant and Professor of Soil Chemistry, Dep. of Forest Resources, Univ. of New Hampshire, Durham, NH 03824.

Received for publication March 15, 1983. Accepted for publication June 21, 1983.