Predictors of Copper Phytotoxicity in Mining-Contaminated Soils: Findings of Several Years of Research

This paper summarizes the findings of several years of the authors' research on copper phytotoxicity in soils contaminated by copper mining industry in the Valparaiso region of central Chile. Although soils under study were contaminated by several elements, copper was found to be the most important factor limiting plant growth, while the other elements had no statistically significant effect. The concentration of copper in the 0.1 M KNO3 extract proved to be the best indicator of phytotoxicity compared to the total copper content or the activity of free Cu2+ ions in the same extract. The total copper content, pH, and dissolved organic carbon concentration were in turn found to be the most important variables in predicting copper concentration and copper ion activity in the 0.1 M KNO3 extract.

Automated summary

This paper summarizes the findings of the authors' research on copper phytotoxicity in soils contaminated by copper mining industry in the Valparaiso region of central Chile. The study found that among the various elements contaminating the soils, copper was the most important factor limiting plant growth, with no statistically significant effect from other elements. The concentration of copper in the 0.1 M KNO3 extract was identified as the best indicator of phytotoxicity. The total copper content, pH, and dissolved organic carbon concentration were found to be the most important variables in predicting copper concentration and copper ion activity in the extract.