Heavy metals Environmental aspects 53 Absorption and adsorption 40 Dissertations 32 Dissertations, Academic 32 Analysis 28 Effect of heavy metals on 16 Water 16 Heavy metal content 12 Pollution 12 Soils 12 Atomic absorption spectroscopy 11 Purification 11 Toxicology 10 Trace elements 10 Sewage 9 Water quality 9 Bioaccumulation 8 Heavy metals removal 8 Physiological effect 7 Adsorption 6 Research 6 Chemistry, Analytic 5 Copper 5 Cadmium 4 Carbon, Activated 4 Marine algae 4 Marine pollution 4 Physiology 4 Soil pollution 4