Composição e Propriedades Ópticas de Substâncias Húmicas do Rio Jacaré, Afluente do Rio São Francisco

• DOI: https://doi.org/10.22533/at.ed.9611125180313

• Palavras-chave: Ultrafiltração; Tamanho Molecular; Carbono orgânico.

• Keywords: -

• Abstract: In the present work, the characterization of dissolved organic matter (DOM) was carried out through fluorescence indices (IF), the extraction and molecular fractionation (FM) of aquatic humic substances (SHA) from the waters of the Jacaré River, a tributary of the right bank from the São Francisco River located in the municipality of Poço Redondo in the State of Sergipe, in order to identify its sources and evaluate the distribution of dissolved organic carbon in fractions with different molecular sizes. For this, about 100L of surface water samples were collected in March 2019. The IF used to characterize the MOD were HIX, BIX and FIX. The column adsorption 1) Bolsista PNPD do Programa de Pós-Graduação em Recursos Hídricos, Universidade Federal de Sergipe, Avenida Marechal Rondon, s/n, Jardim Rosa Elze, São Cristóvão, SE, CEP: 49100-000, [email protected] 2) Graduada em Química, Universidade Federal de Sergipe, Avenida Marechal Rondon, s/n, Jardim Rosa Elze, São Cristóvão, SE, CEP: 49100-000, [email protected] 3) Mestre em Recursos Hídricos, Universidade Federal de Sergipe, Avenida Marechal Rondon, s/n, Jardim Rosa Elze, São Cristóvão, SE, CEP: 49100-000, [email protected] 4) Graduanda em Engenharia Química, Universidade Federal de Sergipe, Avenida Marechal Rondon, s/n, Jardim Rosa Elze, São Cristóvão, SE, CEP: 49100-000, [email protected] 5) Graduanda em Engenharia Química, Universidade Federal de Sergipe, Avenida Marechal Rondon, s/n, Jardim Rosa Elze, São Cristóvão, SE, CEP: 49100-000, [email protected] 6) Graduanda em Química Industrial, Universidade Federal de Sergipe, Avenida Marechal Rondon, s/n, Jardim Rosa Elze, São Cristóvão, SE, CEP: 49100-000, [email protected]; 7) Graduando em Química Industrial, Universidade Federal de Sergipe, Avenida Marechal Rondon, s/n, Jardim Rosa Elze, São Cristóvão, SE, CEP: 49100-000, [email protected]; 8) Pesquisador, Programa de Pós-Graduação em Engenharia e Ciências Ambientais, Universidade Federal de Sergipe, Avenida Marechal Rondon, s/n, Jardim Rosa Elze, São Cristóvão, SE, CEP: 49100-000, [email protected]. 9)Pesquisador, Programa de Pós-Graduação em Recursos Hídricos, Universidade Federal de Sergipe, Avenida Marechal Rondon, s/n, Jardim Rosa Elze, São Cristóvão, SE, CEP: 49100-000, [email protected] 2 XVI Simpósio de Recursos Hídricos do Nordeste 15º Simpósio de Hidráulica e Recursos Hídricos dos Países de Língua Portuguesa chromatography method was chosen for the extraction of SHA. The FM was performed using an ultrafiltration system with membrane sizes of 100, 10, 5, 3 and 1 kDa. The results revealed a MOD of more recent origin and less degraded and with a greater predominance of larger compounds (>100kDa). These results suggest that the samples that presented the highest percentage in the larger fractions are in less advanced stages of decomposition, corroborating what was observed by the results of the fluorescence indices.