AI Article Synopsis
- A study was conducted with 11 different soils to examine how soil properties affect cadmium (Cd) stabilization over 360 days, under specific moisture and temperature conditions.
- After the addition of Cd or a combination of cadmium and lead (Pb), it was found that available Cd levels decreased rapidly in the first 15 days, then stabilized by the 60-day mark, with the presence of Pb increasing Cd availability.
- The stabilization process was mathematically represented and found to be influenced by soil properties, showing that higher pH and cation exchange capacity (CEC) slow down Cd availability, while soil texture impacts how quickly Cd stabilizes, with sandy soil proving more efficient than clay.
Article Abstract
In order to clarify the effects of soil properties on the stabilization process of the cadmium (Cd) added, 11 different soils were collected and incubated under a moisture content of 65%-70% at 25 degrees C. The changes of available Cd contents with incubation time (in 360 days) in Cd and Cd-Pb contaminated treatments were determined. The stabilization process was simulated using dynamic equations. The results showed that after 1.0 mg x kg(-1) Cd or 500 mg x kg(-1) Pb + 1.0 mg x kg(-1) Cd were added into the soil, the available Cd content decreased rapidly during the first 15 days, and then the decreasing rate slowed down, with an equilibrium content reached after 60 days' incubation. In Cd-Pb contaminated soils, the presence of Pb increased the content of available Cd. The stabilization process of Cd could be well described by the second-order equation and the first order exponential decay; meanwhile, dynamic parameters including equilibrium content and stabilization velocity were used to characterize the stabilization process of Cd. These two key dynamic parameters were significantly affected by soil properties. Correlation analysis and stepwise regression suggested that high pH and high cation exchange capacity (CEC) significantly retarded the availability of Cd. High pH had the paramount effect on the equilibrium content. The stabilization velocity of Cd was influenced by the soil texture. It took shorter time for Cd to get stabilized in sandy soil than in the clay.
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