VANADIUM, MOLYBDENUM AND ANTIMONY CONTENTS IN SOILS OF DIFFERENT LITHOLOGIES IN SANTA CATARINA. Trace element levels knowledge in soils is important for establishing quality standards. This study has objective to determine levels of vanadium (V), molybdenum (Mo) and antimony (Sb) in soils from Santa Catarina, observing the different source materials and establishing relationships between these elements and soil properties. The extractions occurred according to USEPA 3051 A protocol, with nitric and hydrochloric acid addition for V and Mo and only with hydrochloric acid for Sb. The quantification of V and Mo occurred by inductively coupled plasma optical emission spectrometry and of Sb by hydride generation inductively coupled plasma optical emission spectrometry. The results were submitted to variance analysis and Scott-Knott test and evaluated by Pearson’s correlation with soil attributes. V and Mo contents differed between soils of different source materials. Highest V levels were found in andesite and basalt soils and Mo in porphyry phonolite, granite, mica schist and sedimentary rocks. V and Sb showed a positive correlation with each other and with oxides of iron, silt, and organic carbon. Mo showed a negative correlation with cation exchange capacity (CEC), iron oxides and organic carbon.

Resumo O arsênio (As) é listado como um dos elementos químicos mais nocivos ao homem e ao meio ambiente, devido a sua alta toxidade e por ser amplamente distribuído na crosta terrestre, destaca-se a sua preocupação dos teores deste elemento em solos, sendo de suma importância conhecer os teores naturais de As no contexto regional. O objetivo do presente estudo foi determinar o teor de arsênio no horizonte A de 31 perfis de solos do estado de Santa Catarina Brasil, podendo este trabalho auxiliar nos valores de referência, monitoramento, remediação de áreas contaminadas, regulamentos e leis brasileiras. As amostras de solos foram preparadas segundo o método USEPA 3051A SW-846 e pré-reduzidos quimicamente do As(V) para As(III) através do método BCR. A determinação foi realizada em Espectrômetro de Emissão Óptica com Plasma Acoplado Indutivamente com Geração de Hidreto. Os resultados obtidos dentre o conjunto de solos, mostram que o material de origem basáltica, foram os que apresentaram os maiores teores de As e o material de origem de sedimentos com os menores. Os perfis de solo se enquadram na decrescente ordem no quesito dos teores de As na seguinte sequência: Latossolos > Nitossolo > Chernossolos = Cambissolo = Argissolo > Neossolos.

Abstract Arsenic (As) is one of the most harmful chemical elements known to man and to the environment, mainly due its high toxicity and wide distribution; the content of this element within the soils is a genuine concern, thus making it paramount to know its natural contents in a regional context. The present study aimed to determine the natural Arsenic content in the A horizon of 31 soil profiles from the state of Santa Catarina, Brazil, which is useful in determining reference values, monitoring, remediation of contaminated areas, legal regulation and Brazilian laws. Soil samples were prepared following the USPEA 3051A SW-846 method and were previously chemically reduced from As(V) to AS(III) by using the BCR method. The determination was performed in an Inductively Coupled Plasma - Optical Emission Spectrometry - Hydride Generation (ICP-OES-HG at cold vapor). Results obtained from the soil groups reveal the materials of basaltic origins as the ones with more As content while those of sediment origins had lesser content. Evaluated soil profiles fit into the following descending order regarding their As content: Latossolos, according to EMBRAPA (Oxisols according to Soil Taxonomy) > Nitossolo (Ultisols, Oxisols (Kandic), Alfisols) > Chernossolos (---) = Cambissolo (Inceptisols) = Argissolo (Ultisols) > Neossolos (Entisols).