Fig. 6From: The study of the variability of biomass from plants of the Elodea genus from a river in Germany over a period of two hydrological years for investigating their suitability for biogas productionConcentrations of heavy metals. Concentrations of chrome (a), lead (b), nickel (c), zinc (d), cadmium (e), and copper (f) that are relevant for legal waste and fertilizer requirements as a function of volatile solidsBack to article page