Cadmium background concentrations to establish reference quality values for soils of So Paulo State, Brazil

Autor(es)

de Oliveira, Vinicius Henrique ^[1] ; de Abreu, Cleide Aparecida ^[2] ; Coelho, Ricardo Marques ^[2] ; Azevedo Melo, Leonidas Carrijo ^[3]

Afiliação do(s) autor(es)

^[1] Agron Inst IAC, BR-13022902 Campinas, SP - Brazil

^[2] Agron Inst IAC, Ctr Soils & Environm Resources, Campinas, SP - Brazil

^[3] Univ Fed Vicosa, Dept Soils, BR-36570000 Vicosa, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ENVIRONMENTAL MONITORING AND ASSESSMENT; v. 186, n. 3, p. 1399-1408, MAR 2014.
• Citações Web of Science: 5

Resumo

Proper assessment of soil cadmium (Cd) concentrations is essential to establish legislative limits. The present study aimed to assess background Cd concentrations in soils from the state of So Paulo, Brazil, and to correlate such concentrations with several soil attributes. The topsoil samples (n = 191) were assessed for total Cd contents and for other metals using the USEPA 3051A method. The background concentration was determined according to the third quartile (75th). Principal component analysis, Spearman correlation, and multiple regressions between Cd contents and other soil attributes (pH, cation exchange capacity (CEC), clay content, sum of bases, organic matter, and total Fe, Al, Zn, and Pb levels) were performed. The mean Cd concentration of all 191 samples was 0.4 mg kg(-1), and the background concentration was 0.5 mg kg(-1). After the samples were grouped by parent material (rock origin) and soil type, the background Cd content varied, i.e., soils from igneous, metamorphic, and sedimentary rocks harbored 1.5, 0.4, and 0.2 mg kg(-1) of Cd, respectively. The background Cd content in Oxisols (0.8 mg kg(-1)) was higher than in Ultisols (0.3 mg kg(-1)). Multiple regression demonstrated that Fe was primarily attributed to the natural Cd contents in the soils (R (2) = 0.79). Instead of a single Cd background concentration value representing all So Paulo soils, we propose that the concentrations should be specific for at least Oxisols and Ultisols, which are the primary soil types. (AU)

• Processo FAPESP: 12/05490-3 - Concentração de base e risco ecotoxicológico de cádmio em solos
• Beneficiário: Cleide Aparecida de Abreu
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/14744-6 - Concentração de base e risco ecotoxicológico de cádmio em solos
• Beneficiário: Vinícius Henrique de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Mestrado