VALORES DE REFERÊNCIA DA CONCENTRAÇÃO DE METAIS PESADOS EM SOLOS NA AMAZÔNIA CENTRAL

Considering the size of the Amazon region and the need for studies to establish soil trace metal concentrations in natural environments, the objective of this work was to evaluate heavy metal contents in a toposequence of an Amazon State microbasin. Soil samples were collected in three native forest topographic positions. Samples were opened for analysis by two methods: exchangeable cations were determined by the silver thiourea method and total metal elements by sulfuric acid. The metals were determined by atomic absorption spectrometry. In general, it was observed low concentration of severa...