2009•Journal of Southwest UniversityRequires access
Effects of pH and Organic Matter on Adsorption of Magnesium in Soil
Ming Gao
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Abstract
The effects of pH and organic matter on adsorption of magnesium in yellow soil,purple soil and calcareous soil were studied in a batch adsorption experiment.Considerable differences were observed among the three soils in their maximum Mg adsorption under different pH and organic matter conditions.The adsorption of magnesium was mainly related to the changes in pH in yellow soil and purple soil.In the pH range of 3.5-7.5,the maximum magnesium adsorption varied from 1 336.25 to 2 054.77 mg·kg-1 in the yellow soil and from 1 417.04 to 2 025.38 mg·kg-1 in the purple soil,while little change was detected in the calcareous soil.The ability of Mg adsorption decreased after the removal of organic matter in the above three soils and the maximum Mg adsorption decreased by 363.31 mg·kg-1,148.72 mg·kg-1 and 120.00 mg·kg-1,respectively.Magnesium adsorption in soils was well fitted with the Langmuir equation.