Natural backgrounds and reference values of trace-element in earth murundus fields on the Southern Amazon

Abstract

Earth mounds fields are wetlands characterized by having a plan relief interspersed with mounds. The knowledge of the levels of trace elements in this environment is important to support sustainable management in areas subject to human intervention in order to reconcile the productive demand and environmental conservation. The objective of this study was to determine the levels and establishing baseline values for trace elements (Zn, Ni, Cu, Cr, Pb, As, Cd, and Se), Fe and Mn in the earth mounds fields soils on the southwest region of the Mato Grosso State. For this soil samples were collected at the depth of 0 to 20 and 20 to 40 cm in "murundus" and "flat" environments, which represent the mounds themselves and the area around it, respectively. The proposition of baseline values was performed according to Conama Resolution 420/2009. The baseline values proposed for these environments were: Zn 7.8; Ni 6.0; Cu 9.2; Cr 21.0; Pb 10.8; As 1.6; Cd <0.03; Se <0.31 and Mn 16.5 mg kg -1 and Fe 4.9 g kg -1 . The levels observed reflect the poverty of the source materials of these soils in these elements, as well as the absence of contamination.Key words: wetlands; heavy metal; livestock; soil quality Teores naturais e valores de referência de elementos-traço em campos de murundus na Amazônia Meridional RESUMOCampos de murundus são áreas úmidas caracterizadas por apresentar um relevo plano intermeados por montículos, denominados murundus. O conhecimento dos teores de elementos-traço nesses ambientes é importante para subsidiar uma gestão sustentável em áreas sujeitas à intervenção antrópica de modo conciliar a demanda produtiva e a conservação ambiental. O objetivo desse trabalho foi determinar os teores e propor valores de referência de qualidade (VRQs) de elementos-traço (Zn, Ni, Cu, Cr, Pb, As, Cd e Se), Fe e Mn no solo dos campos de murundus na região sudoeste de Mato Grosso, Brasil. Para isso, foram coletadas amostras de solo nas profundidades de 0 a 20 e 20 a 40 cm, nos ambientes "murundu" e "plano", os quais representam os murundus propriamente ditos e a área em seu entorno, respectivamente. A proposição de VRQs foi realizada de acordo com a resolução Conama 420/2009. Os VRQs propostos para esses ambientes foram: Zn 7,8; Ni 6,0; Cu 9,2; Cr 21,0; Pb 10,8; As 1,6; Cd <0,03, Se <0,31 e Mn 16,5 mg kg -1 e Fe 4,9 g kg -1 . Os teores observados refletem a pobreza do material de origem dos solos nesses elementos, bem como a ausência de contaminação.Palavras-chave: áreas úmidas; metal pesado; pecuária; qualidade do solo

Background concentrations and quality reference values for some potentially toxic elements in soils of São Paulo State, Brazil

“…1016/j.jenvman.2018.05.048 Received 20 March 2018Received in revised form 14 May 2018;Accepted 15 May 2018 While the PV and IV are established by the CONAMA Resolution (human health-based risk), and valid for the whole country, whereas QRV must be determined by each state (CONAMA, 2009). Consequently, studies have been carried out to establish QRV for some Brazilian regions (Paye et al, 2010;Biondi et al, 2011;Santos and Alleoni, 2012;Gabos et al, 2014;Oliveira et al, 2014;Preston et al, 2014;Almeida Júnior et al, 2016;Silva et al, 2017). However, a lot of areas have been partially or totally neglected.…”

Trace Elements Reference Values for Soils from Santa Catarina, Brazil

“…Knowing the trace elements contents in soils with no or minimal human activity is important when verifying contamination in soils, since these values can be used in adopting preventive practices, control mitigation and in the identification, monitoring and the recovering of contaminated areas (SILVA et al, 2017;NOGUEIRA et al, 2018). All over the world, the comparison of trace elements content with the standard values established by legislation is often used for checking the soil contamination and thus characterize the potential risk (MAZHARI et al, 2017).…”