Avaliação geoquímica de elementos-traços em testemunhos no estuário do Rio Potengi - RN
Estuaries are areas of complex investigations representing environments in constant evolutionary process, constituting the means of interaction between sea, rivers and anthropic activities. In these regions, the abundance, distribution and speciation of chemical elements (metals and non-metals) i...
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| Formato: | Dissertação |
| Idioma: | por |
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Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/26550 |
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| Resumo: | Estuaries are areas of complex investigations representing environments in constant
evolutionary process, constituting the means of interaction between sea, rivers and anthropic
activities. In these regions, the abundance, distribution and speciation of chemical elements
(metals and non-metals) in the sediments can be affected by hydrodynamic processes related
to variations in lithology, topography, vegetation, rainfall, river flows, input of tidal currents
during flood and ebb and/or tidal cycles, among others. The main objective of this research
was to understand the processes that control the variability of the chemical elements in cores
along the Potengi river estuary, including the possible contribution of anthropogenic sources.
Statistical tools, such as the coefficient of variation, were used for duplicate samples and for
analytical results obtained in different grading classes (total fraction and fraction less than
0.063 mm). The results were also compared to toxicological limits established by the National
Oceanic and Atmospheric Administration (NOAA) in order to diagnose the quality of the
sediments and their influence on the existing biota in the estuary. Applying specific
methodologies it was possible to estimate the background of the studied estuarine region. The
results were also compared with other tropical estuaries that used similar methodologies in
Brazil and in the World. A total of 13 elements (Al, As, Ba, Co, Cr, Cu, Fe, Mg, Mn, Ni, Pb,
Sr and Zn) were evaluated along three cores distributed longitudinally in the Potengi River
estuary, being one more upstream (CPOT A), one in the middle part (CPOT B) and another at
the mouth of the estuary (CPOT C), where the results indicated anthropogenic action and
geogenic enrichment for the area investigated. The core collected in the intermediate region of
the estuary (CPOT B) was more worrisome, mainly the chromium element. The influence of
the proximity of the urbanized area of the city of Natal, which discharges sanitary waste
without previous treatment, associated to manufactured goods industries contributed to
alarming levels of contamination in this sampling region. |
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