We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Effects of Different Passivating Agents on Cd Pollution in Alkaline Farmland Soil
Summary
Researchers applied two passivating agents, aluminosilicate and calcium-aluminum hydrotalcite, at rates of 200 and 400 kg/mu to cadmium-polluted alkaline farmland in Henan Province, China, analyzing cadmium fractions by BCR extraction. Both agents modified soil pH and altered cadmium speciation, with results providing guidance on passivation strategies for cadmium remediation in northern Chinese alkaline soils.
In this study, cadmium-polluted farmland in the southern suburbs of Jiaozuo, Henan Province was selected as the research object. Under the field conditions, two passivating agents such as aluminosilicate and calcium-aluminum hydrotalcite were added respectively, and the cadmium form content was analyzed by BCR extraction method. The passivating effect of different passivating agents on soil cadmium in alkaline farmland in northern China was studied under the application rate of 200 and 400kg/mu. The results showed that silicoaluminate and calcium-aluminum hydrotalcite reduced soil pH value in different degrees, but had little effect on soil pH value. The two passivating agents can convert the soluble Cd of weak acid to the residual Cd, and the transformation effect is more significant with the increase of the applied amount. The passivation effect is ranked as calcium aluminum hydrotalcite > silicaluminate, among which 400 kg/mu of calcium aluminum hydrotalcite has the most obvious passivation effect, and the effective content of Cd is reduced by 70.5% compared with group CK. In general, after the application of two passivators and different amounts, the soluble Cd content of weak acid in soil decreased significantly, the reducible Cd content decreased slightly, the oxidizable Cd content increased slightly, and the residual Cd content increased significantly.
Sign in to start a discussion.
More Papers Like This
Insights on Immobilization of Cd Contamination in Soil: Synergic Impacts of Water Management and Bauxite Residue
Researchers tested whether combining flooding with bauxite residue or lime could reduce the availability of toxic cadmium in contaminated soil. Both combined treatments raised soil pH and increased the proportion of cadmium locked into stable, residual forms while decreasing the easily exchangeable fraction. The bauxite residue treatment proved slightly more effective at immobilizing cadmium, offering a potential soil remediation strategy for heavy metal-contaminated agricultural land.
A review on adsorption characteristics and influencing mechanism of heavy metals in farmland soil
Researchers reviewed the characteristics and mechanisms of heavy metal adsorption in farmland soil, examining factors including soil heterogeneity, physical and chemical properties, competitive adsorption, and external influences. The study highlights that soil adsorption reduces crop uptake of pollutants like lead and cadmium, providing a natural self-purification capacity for contaminated agricultural land.
Anionic Intercalated CaMgFe-Layered Double Hydroxides for Synchronous Passivation of Heavy Metals Contaminated Farmland Soils with Soil Fertility Enhancement and Microbial Community Reconstruction
Scientists developed a new soil treatment that can trap three dangerous heavy metals (arsenic, cadmium, and lead) in contaminated farmland while also making the soil more fertile for growing crops. The treatment reduced these toxic metals to much safer levels and helped beneficial soil bacteria grow, which is important because heavy metals can move from soil into our food and harm human health. This could help clean up polluted farmland while still allowing farmers to grow healthier food.
The Importance of Humic Acids in Shaping the Resistance of Soil Microorganisms and the Tolerance of Zea mays to Excess Cadmium in Soil
Researchers assessed whether a humic acid soil amendment (Humus Active) could protect maize from cadmium toxicity by modifying the soil bacterial community structure under heavy metal stress. Humic acid treatment improved soil bacterial diversity and reduced cadmium uptake by maize, suggesting that humic preparations can partially restore soil microbiome function and crop health in cadmium-contaminated agricultural land.
A New Sight of Influencing Effects of Major Factors on Cd Transfer from Soil to Wheat (Triticum aestivum L.): Based on Threshold Regression Model
Researchers applied threshold regression models to investigate how major soil factors including pH, organic matter, and clay content influence cadmium transfer from soil to wheat grain (Triticum aestivum L.), identifying threshold effects that conventional linear models cannot capture. The study found that the influence of pH and other soil variables on cadmium bioaccumulation was non-linear, with critical threshold values above or below which transfer dynamics changed markedly.