Impacto antropogênico ao aporte de fósforo em sedimentos superficiais da bacia hidrográfica do Rio Sergipe

• Ano de defesa: 2023
• Autor(a) principal: Santos, Cleciana do Rosário
• Orientador(a): Passos, Elisangela de Andrade
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Programa de Pós-Graduação: Pós-Graduação em Química
• Palavras-chave em Português: Sedimentos fluviais; Fosfatos; Análise multivariada; Sedimento; Fracionamento químico; UV-Vis
• Palavras-chave em Inglês: Sediment; Chemical fractionation; Phosphate; Multivariate analysis
• Área do conhecimento CNPq: CIENCIAS EXATAS E DA TERRA::QUIMICA
• Link de acesso: http://ri.ufs.br/jspui/handle/riufs/17506

Phosphorus is essential to ensure the trophic state of aquatic environments. This can be derived from natural or anthropogenic sources and its high concentration can be harmful and generate impacts on the ecosystem. In this context, it is necessary to control the concentration of phosphorus in aquatic environments. The main objective of this work is to determine and evaluate the concentration of phosphorus in surface sediments from nineteen points distributed in the hydrographic basin of the Sergipe River. For this, the methodology used was the Standards Measurements and Testing (SMT) protocol, a method adapted by Williams et al. In addition, the efficiency of the analytical method was analyzed through the limit of detection (LoD) and the limit of quantification (LoQ), which varied between 0.80 and 1.13 µg. g-1 , and 2.60 and 3.24 µg g-1 , respectively. The analytical method proved to be efficient since the agreement between certified reference material was between 98 and 105%. The mean concentrations of PT, PI, PO, PAP, PNAP, Fe, Al and MO were 162.50, 100.27, 53.84, 58.78, 34.70, 1.61, 5.31 and 1.04, respectively. The highest concentrations of total phosphorus were found in points P01, P09 and P10. Points P16, P17, and P18 presented the lowest values of total phosphorus. It is worth mentioning that the CONAMA Resolution 454/2012 establishes a maximum limit of phosphorus allowed for dredged material of 2000 mg/kg for PT. Through the principal component analysis (PCA) and hierarchical clustering (HCA), it was possible to observe that the sample points with higher concentrations of phosphorus are better grouped in PC1 and the other points showed greater dispersion. Thus, the points P01, P09 and P10 showed indicative of areas with intense agricultural and industrial exploitation, corroborating for the higher concentrations of phosphorus, and the points P16, P17 and P18 may be related to the natural origin of phosphorus in sediments.