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Related Experiment Video

Updated: Dec 9, 2025

Assessment of Waste-Derived Biochars on the Health and Biological Activity of Soil
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Evaluating Cr behaviour in two different polluted soils: Mechanisms and implications for soil functionality.

A E Pradas Del Real1, A Pérez-Sanz1, P García-Gonzalo1

  • 1Department of Agroenvironmental Research, IMIDRA, Alcalá de Henares, 28800, Madrid, Spain.

Journal of Environmental Management
|September 11, 2020
PubMed
Summary
This summary is machine-generated.

Soil organic matter and pH are key to chromium (Cr) availability and plant growth in contaminated soils. Understanding Cr redox and adsorption mechanisms is crucial for soil remediation and risk assessment.

Keywords:
BioavailabilityBiological qualityChromiumFTIRSOMSilene vulgaris

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Area of Science:

  • Environmental Science
  • Soil Science
  • Geochemistry

Background:

  • Chromium (Cr) contamination poses risks to soil health and plant life.
  • Understanding Cr speciation and bioavailability is essential for assessing soil recovery.
  • Previous studies often lack detailed mechanistic insights into Cr behavior in diverse soil types.

Purpose of the Study:

  • To investigate the mechanisms controlling chromium speciation and availability in two distinct soils.
  • To evaluate the influence of Cr contamination on soil biological quality and plant growth.
  • To determine the role of soil organic matter (SOM) and pH in Cr transformations and plant recovery.

Main Methods:

  • Greenhouse experiment with Silene vulgaris grown in contaminated soils for 21 months.
  • Logistic Regression Model with Lasso estimator to identify key factors influencing Cr availability.
  • X-ray Absorption Spectroscopy (XAS) and Infrared Spectroscopy (FTIR) to analyze Cr speciation and soil functional groups.

Main Results:

  • Soil organic matter (SOM) and pH were identified as primary regulators of Cr availability.
  • In sludge-amended soils, Cr(III) was dominant, leading to improved soil quality and plant growth.
  • Cr(VI) contamination showed varied effects: persistent Cr(VI) in alkaline, low-SOM soils inhibited growth, while reduction to Cr(III) in neutral, high-SOM soils allowed recovery.

Conclusions:

  • Cr redox and adsorption mechanisms significantly dictate soil function recovery in contaminated environments.
  • SOM plays a critical role in reducing toxic Cr(VI) to less harmful Cr(III).
  • The proposed methodology enables effective risk assessment and management strategies for chromium-polluted soils.