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Stabilizing Effects on a Cd Polluted Coastal Wetland Soil using Calcium Polysulphide
Chen Tu1, Feng Guan1,2, Yuhuan Sun2
1Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China.
Geoderma
|December 4, 2018
Summary
Calcium polysulphide (CaSx) effectively stabilizes cadmium (Cd) in wetland soils. The optimal dosage of 1% CaSx improved soil quality and microbial activity, offering a safe remediation strategy for heavy metal pollution.
Area of Science:
- Environmental Science
- Soil Science
- Remediation Technology
Background:
- Cadmium (Cd) contamination in wetland soils poses significant environmental risks.
- Effective in situ remediation strategies are crucial for mitigating heavy metal toxicity.
Purpose of the Study:
- To investigate the efficacy of calcium polysulphide (CaSx) dosages in immobilizing Cd in wetland soil.
- To assess the impact of CaSx on soil chemical properties, enzyme activities, and microbial communities.
Main Methods:
- Pot experiment using varying CaSx dosages.
- Chemical analysis (pH, DTPA-extractable Cd).
- Soil enzyme activity assays (urease, catalase) and Biolog EcoPlate analysis.
Main Results:
- CaSx amendment initially increased soil pH, which later declined.
- Cd immobilizing efficiency decreased with increasing CaSx dosage.
- 1% and 2% CaSx treatments showed microbial activity and community diversity recovery over time.
Conclusions:
- 1% CaSx is an efficient and safe dosage for stabilizing Cd-contaminated wetland soil.
- CaSx shows potential as an in situ remediation ameliorant for heavy metal polluted soils.
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