Extração e caracterização de substâncias húmicas aquáticas do complexo estuarino lagunar Mundaú / Manguaba e interação com íons Hg (II)

Abstract

The Mundaú estuary complex - Manguaba is an important ecosystem for the state of Alagoas, rich in dissolved organic matter has become a source for the development of diverse species of plants and animals. The degradation of residues of plants and animals present in this ecosystem leads to the formation of humic substances, the main component of natural organic matter and responsible for the availability of contaminants and nutrients in the environment. The objective of this work was to extract and characterize humid substances from the Mundau-Manguaba lagoon complex by Uv-vis techniques, Synchronized Fluorescence, Magnetic Resonance of 13C and 1H, Distributed Spectroscopy (DOSY), and Total Organic Carbon (TOC), to analyze the structural influence with the complexation capacity with ions mercury (ll). It was possible to observe that the humic substances of the Manguaba lagoon are more humid, this characteristic is related to the time of renewal of the waters of the lagoon Manguaba. The water humic substances of the Manguaba lagoon also had a higher proportion of lignin structures probably leached, as well as being more aromatic. The profile of the aquatic humic substances of the respective lagoons evidenced the greater influence of aliphatic groups for the structure of these, probably derived from the fulvic acids. The complexation capacity for mercury ions was higher for the Mundaú lagoon samples, showing lower affinity for aromatic structures.