The presence of trace elements in the soils, above its natural concentrations, can indicate anthropogenic contamination. Therefore, knowing the natural level of trace elements contents in soils is extremely important in monitoring and remediating contaminated areas. The Brazilian National Environment Council (CONAMA) determines that the states and the Federal District establish the Quality Reference Values (QRV), based on the natural levels of inorganic substances content in soils. Thus, this study aimed to determine the QRV of barium (Ba), cadmium (Cd), nickel (Ni), copper (Cu), zinc (Zn), chromium (Cr), lead (Pb), manganese (Mn) and cobalt (Co) for soils from Santa Catarina. For such, the natural content levels of Cu, Zn, Cr, Pb, Ba, Cd, Ni, Co and Mn were obtained for 43 representative profiles from the state. The natural content and the Quality Reference Values determination for soils from Santa Catarina complied with that requested by the current legislation. The QRV (mg kg-1) was determined based on the 75th percentile (upper quartile) and it was evident, due to the differences among the source materials in SC soils, the need in keeping it by soil groups with similar physical and chemical characteristics, in order to reduce the error possibility in future inspections. Keywords: Natural Contents. Representative Soils. Environmental Monitoring. Environmental Pollution. Resumo A presença de elementos-traço nos solos acima das concentrações naturais pode indicar contaminação antrópica. Sendo assim, o conhecimento dos teores naturais de elementos-traço dos solos é de extrema importância no monitoramento e remediação de áreas contaminadas. O Conselho Nacional de Meio Ambiente (CONAMA) determina que os estados e o Distrito Federal estabeleçam os Valores de Referência de Qualidade (VRQ), baseados nos teores naturais de substâncias inorgânicas nos solos. Dessa forma, este trabalho objetivou determinar os VRQ de bário (Ba), cádmio (Cd), níquel (Ni), cobre (Cu), zinco (Zn), cromo (Cr), chumbo (Pb), manganês (Mn) e cobalto (Co) para solos de Santa Catarina. Para tanto foram utilizados os teores naturais de Cu, Zn, Cr, Pb, Ba, Cd, Ni, Co e Mn obtidos para 43 perfis representativos do estado. Os teores naturais e a determinação dos Valores de Referência de Qualidade para solos de Santa Catarina obedeceram ao preconizado pela legislação vigente. Os VRQ foram determinados com base no percentil 75 (quartil superior) e devido às diferenças entre materiais de origem nos solos de SC, viu-se a necessidade de manter os VRQ por grupo de solos com características físicas e químicas semelhantes, a fim de reduzir a possiblidade de erros em futuras fiscalizações. Palavras-chave: Teores Naturais. Solos Representativos. Monitoramento Ambiental. Poluição Ambiental.
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