1 Organometallic compounds in the environment: An overview.- 2 Advances in analytical methods for speciation of trace elements in the environment.- 3 Analytical strategies for arsenic speciation in environmental and biological samples.- 4 Occurrence and speciation of arsenic, antimony and tin in specimens used for environmental biomonitoring of limnic ecosystems.- 5 Methylated metal(loid) species in biological waste treatment.- 6 Volatile mercury species in environmental gases and biological samples.- 7 Biovolatilisation of metal(loid)s by microorganisms.- 8 The Effect of Phosphate on the Bioaccumulation and Biotransformation of Arsenic(V) by the Marine Alga Fucus gardneri.- 9 Molecular modeling studies of specific interactions between organometallic compounds and DNA.- 10 Organometal(loid) compounds associated with human metabolism.- 11 Genotoxicity of organometallic species.- 12 Current aspects on the genotoxicity of arsenite and its methylated metabolites: Oxidative stress and interactions with the cellular response to DNA damage.- 13 Cytogenetic investigations in employees from waste industries.- 14 Neurotoxicity of metals.- 15 Actions of metals on membrane channels, calcium homeostasis and synaptic plasticity.- 16 Effects of organometal(loid) compounds on neuronal ion channels: possible sites for neurotoxicity.- 17 Panel discussion: Analytical aspects Discussion Session on “Speciation Analysis of Environmental Samples”.- 18 Panel discussion: Toxicological Aspects Discussion Session on “Toxicological Aspects of Alkylated Metal(loid) Species”.- Resumé.