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

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ResumoO alumínio (Al) "trocável" do solo é tradicionalmente extraído com solução de KCl 1 mol L -1 (Al-KCl). O emprego desta solução pode superestimar o Al trocável, implicando uma interpretação equivocada dos efeitos tóxicos desse elemento às plantas. O estudo objetivou avaliar, por meio de extrações químicas sequenciais (ES) e não sequenciais (ENS), as possíveis frações de Al que possam estar contribuindo para a superestimação do Al trocável e se as mesmas estão relacionadas com sua toxicidade nas plantas de soja cultivadas em casa de vegetação. Também, identificar a eficácia do KCl 1 mol L -1 em extrair somente as frações tóxicas do Al e o extrator que melhor estimou o potencial tóxico do mesmo às plantas.Para isso, foram realizadas ES utilizando os extratores, na ordem, CaCl2 0,01 mol L -1 , KCl 0,1 e 1 mol L -1 e oxalato de amônio 0,2 mol L -1 e ENS com uma única extração, utilizando-se somente das três últimas soluções. O Al proveniente de polímeros amorfos foram responsáveis pela superestimação do Al-KCl. O Al extraído pelos diferentes extratores não está relacionado com sua toxicidade às plantas. Para os solos AC9 e RS não houve resposta das plantas de soja à calagem e tampouco manifestação expressiva de toxicidade de Al nas mesmas. Nos solos PE, BR e CB, o KCl 1 mol L -1 foi eficaz na estimativa do Al trocável e do seu potencial tóxico. O CaCl2 0,01 mol L -1 foi o extrator que melhor identificou o potencial tóxico do Al nos solos avaliados.Palavras-chave adicionais: alumínio trocável; extratores; métodos de extração; polímeros de Al amorfos.

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). Keywords: arsenic content, reference value, soils, trace element.