Dispersão de metais em solos de manguezal no município de Santo Amaro, Bahia, Brasil

Abstract

Due to anthropogenic pressures the mangroves have undergone great increases in the levels of chemical pollutants. Industrial activities, mainly mining activities, are the major sources of significant increase in these contaminants, since many of these activities involve processing and processing of materials rich in various heavy metals, such as Lead, Cadmium, Arsenic, Mercury, Zinc, among others , compromising the quality of the ecosystem. The present work aimed to evaluate the dispersion of Cadmium, Lead and Zinc metals in mangrove soils in the municipality of Santo Amaro, Bahia, Brazil. For soil sampling, a quadrant of 40m by 40m was subdivided, subdivided into quadrants of 100m2, and every ten meters were obtained composite samples, from five simple samples, considering the depth of 0-20cm, in the UFRB, were dried, macerated and sieved in mesh less than 0.063mm. The chemical analyzes followed the methodology of the American Environmental Protection Agency method-3050B and the metals were quantified in Atomic Absorption (Varin 240 S). The data were submitted to statistical and geostatistical analyzes and comparisons with international environmental agencies, Americana and Environmental Canada, which presents reference values for the metals studied in marine environments. The results showed that among the evaluated metals the lead was unique that did not show uniform dispersion in the environment, presenting high concentrations in only two sampling points and were higher than the referenced values. Although the region shows lead contamination, in the area of cadmium study was the metal that presented concentrations above the reference values and requires more attention.