EN
Heavy metals speciation was performed using Rudd's method of extracting heavy metals, the selective extraction technique using 1M of KN03; 0.5 M KF; 0.1 M Na4P207; 0.1 M EDTA and 6M HN03. In herbal dust gathered from different sites around a herb — processing facility, exchangeable and soluble forms, organic combinations, carbonates and sulphides of the following metals were distinguished: Pb, Cd, Cu, Mn, Ni, Zn and Fe.