Chemical and spectroscopic characterization of humic acids extracted from the bottom sediments of a Brazilian subtropical microbasin

M. Giovanela*, J. S. Crespo, M. Antunes, D. S. Adamatti, A. N. Fernandes, A. Barison, C. W.P. Da Silva, R. Guégan, M. Motelica-Heino, M. M.D. Sierra

*この研究の対応する著者

研究成果: Article査読

77 被引用数 (Scopus)

抄録

Humic substances (HS) perform a fundamental role in aquatic environments, exhibiting different levels of reactivity in retaining metal ions and organic pollutants. Also, they control the primary production of these ecosystems and act in the carbon sequestering process. In order to improve our understanding vis - vis the structural and functional features of HS from aquatic systems, this study aimed to chemically and spectroscopically characterize humic acids (HA) isolated from bottom sediment samples of a stream in a Brazilian subtropical microbasin by elemental analysis, and infrared (FT-IR), ultraviolet and visible (UV-Vis) and solid-state 13C nuclear magnetic resonance (CP-MAS 13C NMR) spectroscopies, thermogravimetry (TG), and scanning electron microscopy (SEM). Although all samples originated from the same environment, the data showed that the HA have distinct chemical and spectroscopic properties, and that the location and characteristics of the sampling points from which the sediments were collected played an important role in the differences observed. Furthermore, vascular plant matter is probably the main contributor to these samples.

本文言語English
ページ(範囲)111-119
ページ数9
ジャーナルJournal of Molecular Structure
981
1-3
DOI
出版ステータスPublished - 2010 9月 24
外部発表はい

ASJC Scopus subject areas

  • 分析化学
  • 分光学
  • 有機化学
  • 無機化学

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