Plants and Maximum Permissible Concentrations of Heavy Metals in Soil

Abstract

The tentative permissible concentrations and the maximum permissible concentration of heavy metals do not always give a complete adequate assessment of the effect on plants. Plant growth inhibition can be at concentrations below the maximum permissible concentrations and tentative permissible concentrations. We studied the effect of copper, zinc, cadmium, and lead concentrations on plants. The object of the research is the lawn grass, the Agrostis stolonifera used in urban greening. According to the data obtained, Agrostis stolonifera showed a low degree of resistance to copper, lower than the tentative permissible concentration and the maximum permissible concentration. Consequently, the tentative permissible concentration and the maximum permissible concentration do not fully reflect the real phytotoxicity of copper. Plants of Agrostis stolonifera demonstrated a relatively high sensitivity to zinc in comparison with the maximum permissible concentration and the tentative permissible concentration. The content of cadmium and lead corresponding to the tentative permissible concentrations did not have a significant effect on the plants.

New Technologies for Processing Tailings of a Copper Processing Plant for the Extraction of Platinoids

“…Processing and neutralization of technogenic waste from the metallurgical industry is one of the urgent problems of Russia, the USA, Chile and South Africa, and the extraction of precious metals based on their complex processing is one of the new directions of the future [18]. Purpose of the work: development and improvement of the technology of extraction of precious metals from the tailings of copper processing plants [7] [19].…”