Metals complexation with humic acids in surface water of different natural–climatic zones
Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academу of Sciences, Russia
Humic acids extracted from different soils. The stability constants of metal humates and acid dissociation constant humic acids were calculated. Forms of metals in natural waters was determined with use account their chemical composition and content and properties of organic matter. We assessed metals speciation in water objects with account for competitive reactions resulting in formation of hydroxide, hydrocarbonate, sulfate, and chloride metal complexes and obtained a competitive series of metal activity in natural waters of the zones considered.
Key words: Heavy metals / humic acid / complexing / stability constants
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