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Soil Properties Affecting C-type slope as a Parameter for Silica Sorption of Soils  

Lee, Sang Eun (Department of Plant Resources Science, Hankyong University)
Lim, Woo Jin (Department of Plant Resources Science, Hankyong University)
Ahn, Jae Ho (Department of Plant Resources Science, Hankyong University)
Kim, Jeong-Gyu (Division of Environmental Science and Ecological Engineering, Korea University)
Lim, Soo-Kil (Division of Environmental Science and Ecological Engineering, Korea University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.37, no.6, 2004 , pp. 365-370 More about this Journal
Abstract
To invesligate the characteristics of silica sorption on soils silica sorption experiments were conducted with 9 soils at 4 pH levels (5, 6, 7, and 8). Silica sorption increased in great extent with increase of pH. At the same pH level silica sorption increased linearly with increase of equilibrium $SiO_2$ concentration. Silica sorption characteristics was C-type. The C-type slope, i.e., the slope of linear regression of silica sorption isotherm, increased exponentially with increase of pH in all soils. Log(C-type slope) increased linearly with increase of pH in all soils. The slopes of linear regression were similar in most soils from 0.29 to 0.34 except Sachon and Jonggog soil. None of the soil properties showed any correlation with the slope of linear regression of Log(C-type slope) to pH. Only $Fe_o$ (oxalate extractable Fe oxides) was significantly correlated with the Log(C-type slope) at pH 7 in simple correlation analysis, and was shown to be the principal contributor as determined by standardized multiple linear regression.
Keywords
Silica; Sorption; Adsorption; pH; Isotherm; C-type; C-type slope;
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