Abstract
The metal concentrations in water, sediments and mollusks (Tagelus plebeius) of the Manguaba Lagoon and the influence of humic substances from water and sediments in the distribution of these metals were investigated in this work. The mean metal concentrations in water were: Mg (89.0 ± 0.11), Ca (32.0 ± 0.10), Fe (0.97 ± 0.02), Mn (0.52 ± 0.01), Zn (0.33 ± 0.10) and Pb (0.22 ± 0.02) mg L-1. The Pb concentrations were above the Brazilian legislation limit. All sediment data were below maximum limit established by the National Council for the Environment (CONAMA, Brazil) of the Ministry of the Environment, and the concentration ranges for metals were: Fe (1199-60000), Mg (339-8870), Ca (461-3838), Cr (< LOQ-39.5) and Pb (< LOQ-12.5) mg kg-1 (LOQ: limit of quantification). None of the principal contaminants (Cr, Pb and Cd) was determined in Tagelus plebeius, being a positive fact once the population nearby Manguaba Lagoon consumes large amounts of this mollusk. According to the results, the influence of humic substances in the contaminant retention is evident as they become unavailable for absorption by mollusks of Manguaba Lagoon.
Highlights
The economic, social and technological developments have resulted in a considerable increase of environmental pollutants, compromising aquatic and terrestrial systems.[1]
The mean pH value of 7.19 for the sampling points along the lagoon indicated that water had a neutral character according to the potability parameters established by National Council for the Environment (CONAMA, Brazil) of the Ministry of the Environment Resolution No 357/200526 for brackish water of classes I and II
Concerning to the similarity among the evaluated metals (Figure 3b), it can be observed that Ca, Fe and Mg differ from the others due to the high concentrations of these analytes in all environmental samples. These results show the close relationship among all environmental samples explored in this study and the need to make this assessment in order to have a better understanding of the availability mechanisms of metals in estuarine systems, and to develop strategies for preservation of this ecosystem
Summary
The economic, social and technological developments have resulted in a considerable increase of environmental pollutants, compromising aquatic and terrestrial systems.[1]. Trivalent chromium is present in many foods and supplementation products, it can naturally be converted into the hexavalent form, a potent carcinogenic that induces cellular damage
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