Adsorption and pH Values Determine the Distribution of Cadmium in Terrestrial and Marine Soils in the Nansha Area, Pearl River Delta
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area
2.2. Soil Sampling and Chemical Analysis
2.3. Batch Experiments
2.3.1. Isothermal Adsorption Experiment
2.3.2. Adsorption Kinetic Experiment
2.4. Analysis
3. Results and Discussion
3.1. Physical and Chemical Properties of Soils in Two Sedimentary Environments
3.2. Effects of Initial Concentrations on Cadmium Adsorption in the Two Soils
3.3. Effect of Adsorption Time on Cadmium Adsorption in the Two Soils
3.4. Effect of Solution pH Value on Cadmium Adsorption in Two Soils
3.5. Factors Affecting Cadmium Adsorption in Undisturbed Soil Columns
3.5.1. Effect of Soil pH on Cadmium Migration in Undisturbed Soil Columns
3.5.2. Soil Mechanical Composition
3.5.3. Soil Organic Matter
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Acknowledgments
Conflicts of Interest
References
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Soil Mechanical Composition Ratio (%) | SOM | CEC | pH | Cd | |||
---|---|---|---|---|---|---|---|
D < 0.002 mm | 0.002 mm < D < 0.02 mm | 0.02 mm < D < 2 mm | g/kg | cmol/kg | mg/kg | ||
Soil 1 | 35 | 36.8 | 28.2 | 18.0 | 15.2 | 6.40 | 0.52 |
Soil 2 | 18.6 | 17.4 | 64 | 15.8 | 10.5 | 8.08 | 0.48 |
Adsorption Model | Parameter | Unit | Soil 1 | Soil 2 |
---|---|---|---|---|
Henry equation | Kd | L/kg | 42.81 | 51.11 |
Freundlich equation | KF | - | 363.04 | 558.21 |
1/n | - | 0.43 | 0.34 | |
Langmiur equation | KL | - | 0.072 | 0.162 |
Sm | mg/kg | 2419.83 | 2228.25 |
Soil | pH | Expression | COD (R2) | Sm (mg/kg) |
---|---|---|---|---|
Soil 1 | pH = 3.5 | S = 536.27 − 12.13 × 0.968 t | 0.899 | 536.27 |
pH = 4.5 | S = 538.85 − 11.11 × 0.959 t | 0.948 | 538.85 | |
pH = 5.5 | S = 537.18 − 9.69 × 0.852 t | 0.864 | 537.18 | |
pH = 9.5 | S = 540.70 − 5.64 × 0.977 t | 0.906 | 540.70 | |
Soil 2 | pH = 3.5 | S = 545.32 − 6.84 × 0.933 t | 0.883 | 545.32 |
pH = 4.5 | S = 546.27 − 5.83 × 0.933 t | 0.875 | 546.27 | |
pH = 5.5 | S = 546.14 − 5.24 × 0.994 t | 0.801 | 546.14 | |
pH = 9.5 | S = 547.48 − 4.22 × 0.994 t | 0.915 | 547.48 |
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Wang, F.; Bao, K.; Huang, C.; Zhao, X.; Han, W.; Yin, Z. Adsorption and pH Values Determine the Distribution of Cadmium in Terrestrial and Marine Soils in the Nansha Area, Pearl River Delta. Int. J. Environ. Res. Public Health 2022, 19, 793. https://doi.org/10.3390/ijerph19020793
Wang F, Bao K, Huang C, Zhao X, Han W, Yin Z. Adsorption and pH Values Determine the Distribution of Cadmium in Terrestrial and Marine Soils in the Nansha Area, Pearl River Delta. International Journal of Environmental Research and Public Health. 2022; 19(2):793. https://doi.org/10.3390/ijerph19020793
Chicago/Turabian StyleWang, Fangting, Ke Bao, Changsheng Huang, Xinwen Zhao, Wenjing Han, and Zhibin Yin. 2022. "Adsorption and pH Values Determine the Distribution of Cadmium in Terrestrial and Marine Soils in the Nansha Area, Pearl River Delta" International Journal of Environmental Research and Public Health 19, no. 2: 793. https://doi.org/10.3390/ijerph19020793