Metal bioaccumulation by the freshwater algaScenedesmus quadricauda

Abstract

Bioaccumulation of six metals (Cu²⁺, Cu⁺, Mo⁶⁺, Mn²⁺, V⁵⁺, Ni²⁺) and their combinations by algaScenedesmus quadricauda was determined by using radio nuclide X-ray fluorescence (RXFA). The metals were added into the cultivation medium in concentrations corresponding with EC₅₀ value for each metal. The obtained results indicate that Ni²⁺, Cu²⁺ and Cu⁺ were accumulated in high amounts (20%, 17.5% and 15.19%) the Mo⁶⁺ ion (<0.2%) was accumulated in the lowest amount. For metal-metal interactions in accumulation of metal ions by algaS. quadricauda three types of answers were determined: inhibition (Mo→Cu²⁺, Ni, Mn, V; V→Ni, Mn; Mn→Ni, Cu²⁺, Cu⁺; Cu⁺→Ni; Cu²⁺→Ni; Ni→Mn, V), enhancement (V→Cu⁺; Cu²⁺→Mn;Cu⁺→V, Mn; Mn→V; Ni→Cu²⁺, Cu⁺) and neutral effect (V→Mo; Cu²⁺→Mo; Cu⁺→Mo; Mu→Mo; Ni→Mo).