Abstract
This study investigates the physico-chemical properties of granitic residual soils and comparison between two sorption tests; batch and column infiltration tests in evaluating the mobility of Cadmium (Cd) using granitic residual soils. The granitic residual soil has undergone the physical tests (eg: particle size distribution, Atterberg Limits, specific gravity and compaction), chemical tests (eg: pH, organic matter, specific surface area (SSA) and cation exchange capacity (CEC)) and sorption tests. For Batch test, the effect of Cd concentration in single and mixture solutions were studied. The result showed the Kd value of single solution (Kd=0.0062 L/g) was higher compared to mix solution (Kd=0.0022 L/g). For column infiltration test, several factors were studied in this research such as different g-force, different types of solutions and different soil thickness. Results showed that both sorption tests have different effects on mobility of heavy metals through soils. The column infiltration test gave the exact Kd values compared to the batch test since the condition of columns method applied were similar to the natural soil conditions.
Highlights
Human activities such as agricultural, domestic waste, municipal sewage, industrial effluent, mining activities, and landfill introduced the contaminant/ heavy metals to our natural environment [1], [2], [3]
Granitic residual soil has higher percentage of sand ranged between 54%-63% followed by percentage of silt (32%-42%) and clay (1%-6%)
This study showed the soil has low values of organic matter (0.22%-0.34%), specific surface area (SSA) (17.96m2/g-21.93m2/g) and cation exchange capacity (CEC) (0.79meq/100g-1.35meq/100g) where it indicates low adsorption capacity
Summary
Human activities such as agricultural, domestic waste, municipal sewage, industrial effluent, mining activities, and landfill introduced the contaminant/ heavy metals to our natural environment [1], [2], [3]. According to [5] and [6], column leaching techniques was widely used to evaluate the transport model and determined the migration of contaminant through soils. The objectives of this study are to investigate the chemical-physical properties of granitic residual soils and to compare the batch and column techniques in evaluating the mobility of Cadmium (Cd) through granitic residual soil. Granitic residual soil has classified as intermediate plasticity index (9.90%-11.99%). According to [10], low plasticity index indicates lower adsorption capacity. Granitic residual soil showed low pH value (acidic) ranged between 5.35-5.85. This study showed the soil has low values of organic matter (0.22%-0.34%), SSA (17.96m2/g-21.93m2/g) and CEC (0.79meq/100g-1.35meq/100g) where it indicates low adsorption capacity
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