Humic substances (HS) are the most widespread group of organic substances in natural environment and have high
stability. The main terrestrial reserves are found in the form of naturally occurring ore, peat or lignite. The aim of this
paper is to study possibilities to use HS as agents for remediation of contaminated with heavy metals soil and impacts of
HS of metal speciation forms in it. It has been proved that HS are able to bind to metal ions and change their speciation
forms in soils. The ability to form complexes with metal ions depends on the type of soil, type of metal, as well as
concentrations of HS in soil. The study was carried out in experimental conditions and analytical method
to determine availability of metals to living organisms was used for spiked soils. Remediation by using HS has shown
good result for diminishing the content of biologically available copper and lead.