Frações de fósforo do sedimento límnico e sua mobilidade em reservatório da região semiárida tropical
Phosphorus is a crucial nutrient for the aquatic environment, however its excess has brought imbalance to the lake ecosystem. The mobile forms of phosphorus in the sediment are the available fractions that will be released into the water column for assimilation by primary producers. In this co...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/48762 |
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| Resumo: | Phosphorus is a crucial nutrient for the aquatic environment, however its excess has brought
imbalance to the lake ecosystem. The mobile forms of phosphorus in the sediment are the
available fractions that will be released into the water column for assimilation by primary
producers. In this context, the nutrient phosphorus contributes to the eutrophication process,
which results in the excessive and disordered growth of primary producers. Thus, the objective
of this work is to identify and quantify the phosphorus fractions that favor the release and
retention of phosphorus in a reservoir in the tropical semi-arid region. Thus, fractionation
analysis, through sequential chemical extraction and spectrophotometry were performed to
determine the P fractions in the sediment of the Dourado reservoir/RN. From the results, the
highest phosphorus concentrations were the mobile inorganic fraction of P adsorbed to Iron and
Manganese oxides (P-BD) and the non-mobile inorganic fraction of P adsorbed to Aluminum
oxides (P-NaOH), indicating that these fractions can potentially be released into the water
column, with the non-mobile fraction (P-NaOH), released at alkaline pH, this release is induced
mainly in lakes with hot and arid climates. In this scenario, organic P also contributes to the
internal load, as P is released when autochthonous organic matter is mineralized at the
sediment-water interface. On the other hand, the non-mobile fractions of phosphorus adsorbed
to calcium (P-HCl) and phosphorus adsorbed to humic substances (P-Humics) analyzed in the
sediment of the Dourado reservoir showed very similar values and are stable fractions that are
difficult to release. Finally, this study suggests that mitigation techniques for the eutrophication
process in these environments are necessary, taking into account the internal load to effectively
reduce the problem of water quality degradation in several lakes with a high level of trophy and
that experience long periods of drought. |
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