representation of facts and models

Trends in environmental geochemistry in tropical countries.- Paleoclimate studies in Brazil using carbon isotopes in soils.- Soil-to-plant transfer of 137Cs related to its geochemical partitioning in Oxisols of tropical areas.- Speciation, reactivity and mobility of toxic elements in soil systems.- Key role of flow velocity and pH in the lixiviation of mineral-forming elements.- Spatial distribution and seasonal patterns of aquatic emergent plants in Southeast Brazil: Development of a tool for mass balances.- Instrumental multi-element analysis in plant materials: A modern method in environmental chemistry and tropical systems research.- Chemistry and distribution of trace elements in the Patos lagoon, South Brazil.- Mass balance estimation of natural and anthropogenic heavy metal fluxes in streams near the camaquã copper mines, Rio Grande do sul, Brazil.- A model for geochemical partitioning of heavy metals in the mar del Plata coastal ecosystem, Argentina.- Mangrove swamps of the Subaé and Paraguaçú tributary rivers of Todos os Santos Bay, Bahia, Brazil.- Metal scavenging and cycling in a tropical coastal region.- Mercury behaviour in sediments from a sub-tropical coastal environment in SE Brazil.- Diagnosis of environmental problems related to vein gold mining in Colombia.- Assessment of the heavy metal pollution in a gold "garimpo".- Mercury partitioning within alluvial sediments of the Carson river valley, Nevada: Implications for sampling strategies in tropical environments.- Hydrogeochemical description of groundwaters from a coastal region of Rio de Janeiro state, Brazil.- Long term atmospheric aerosol characterization in the Amazon Basin.- Are tropical estuaries environmental sinks or sources?.