期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 28, 期 22, 页码 28808-28824出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-11389-5
关键词
Environment; Anthropic activities; Epilithic biofilms; Chemical composition; Functional groups; Spectrometric techniques
资金
- Mais Agua of FINEP/FEPAGRO
- National Council for Scientific and Technological Development (CNPq, Brazil) [309515/2015-7]
- FAPERGS [19/2551-0001641-7]
- Region Nouvelle Aquitaine (France)
The active functional groups in epilithic biofilms, including polysaccharides, nitrogen-containing compounds, lipids, and aromatic and phenolic structures with characteristic functional groups, such as alcohols, esters, ethers, and amides, were identified. These components can effectively reflect environmental pressures.
Active functional groups in biofilms determine the adsorption and desorption of contaminants and nutrients. Epilithic biofilms were characterized in order to understand the association between the chemistry alteration patterns and the surrounding anthropic activities of the Guapore River watershed. The instrumental analyses included pyrolysis coupled to gas chromatography and mass spectroscopy, spectroscopy in the IR region with attenuated total reflectance, and two-dimensional nuclear magnetic resonance. Spectrometric techniques demonstrated that epilithic biofilms are mainly composed of polysaccharides, nitrogen-containing compounds, lipids, and aromatic and phenolic structures, which have functional groups characteristic of alcohols, esters, ethers, and amides. The polysaccharide levels reflect well the environmental pressures. The chemical composition of epilithic biofilms can be an effective tool for environmental assessment in watercourses, since the different anthropic actions developed in watersheds, mainly agriculture and urban areas, can modify the organic fraction of biofilms.
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