Related Experiment Video
Updated: Feb 5, 2026

Two-Dimensional Visualization and Quantification of Labile, Inorganic Plant Nutrients and Contaminants in Soil
Published on: September 1, 2020
Mechanochemical treatment of Cr(VI) contaminated soil using a sodium sulfide coupled solidification/stabilization
Wenyi Yuan1, Weitong Xu2, Zebing Wu2
1Shanghai Collaborative Innovation Centre for WEEE Recycling, Shanghai Polytechnic University, Shanghai 201209, China; Research Center of Resource Recycling Science and Engineering, Shanghai Polytechnic University, Shanghai 201209, China.
Abstract:
In this research, mechanochemical reduction was carried out to remediate Cr(VI) contaminated soil, and the reduction effectiveness was evaluated by analyzing the corresponding leachable fraction obtained through the toxicity characteristic leaching procedure (TCLP) proposed by the EPA. The results indicated that mechanochemical reduction can efficiently reduce the Cr(VI) concentration in the leachate. Under a milling time of 2 h, milling speed of 500 rpm, ball-to-powder weight ratio of 14 and Na2S dosage of 5%, the Cr(VI) leaching concentration significantly decreased from 663.98 mg L-1 to 0.84 mg L-1, much lower than the regulatory limit of 5 mg L-1. In addition, the significant decrease in Cr(VI) was mainly due to the reduction of Cr(VI) to Cr(III), as supported by X-ray photoelectron spectroscopy (XPS). The mechanochemical reduction with mechanism proposed in this experiment may involve two major processes: solidification and reduction (stabilization).
Related Concept Videos
The Soil Ecosystem
Preparation and Reactions of Sulfides
Contaminants and Errors
Another key consideration is determining the appropriate number of samples required to...
Nuclear Stability
To hold positively charged protons together...
Structure and Nomenclature of Thiols and Sulfides
RNA Stability

