Application of pyrolysis-gas chromatography-mass spectrometry to the characterization of humic substances resulting from decay of aquatic plants in sediments and waters |
| |
Authors: | F. Gadel A. Bruchet |
| |
Affiliation: | 1. Department of Marine Research, Environmental Protection Agency, Taikos av. 26, LT-91222, Lithuania;2. State research institute Center for Physical Sciences and Technology, Savanorių av. 231, LT-02300 Vilnius, Lithuania;1. University of Applied Sciences Hamburg, Department of Environmental Engineering, Ulmenliet 20, 21033 Hamburg, Germany;2. Institute of Biomedical & Environmental Health Research, School of Science, University of the West of Scotland, Paisley Campus, Paisley PA 1 2BE, UK;3. Technical University of Denmark, Department of Environmental Engineering, 2800 Kongens Lyngby, Denmark;4. Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Coastal Research, Max-Planck-Strasse 1, D-21502 Geesthacht, Germany;5. Leibniz Institute for Baltic Sea Research, Seestraße 15, 18119 Rostock, Germany |
| |
Abstract: | Pyrolysis-GC-MS, elemental analysis and i.r. spectroscopy reveal major differences between humic substances from aquatic plants (algae and aquatic phanerogams) and lagoonal, marine and lacustrine deposits. Algae are enriched in proteins and their pyrolysis yields numerous nitrogenous by-products (alkylpyrroles, nitriles and alkylpyridines) along with aromatic compounds which are thought to reflect the decomposition of individual amino-acids (styrene, toluene, phenol and p-cresol). These compounds are less abundant in the pyrolysis products of humic substances from phanerogams with increasing amounts of methoxyphenols, characteristics of lignins.In the deposits of the Kerguelen Islands and of a “blue lake” in Greenland, the importance of algal populations is emphasized by pyrolysis products corresponding to nitrogenous and carbohydrate derivatives. Phenols and cresols in the pyrochromatograms of these samples are interpreted as evidence of polypeptides rather that lignin: p-cresol is much more abundant than the other cresols, suggesting the formation of phenols by way of tyrosine.Lagoonal sediments, in contrast, seem typical of intermixed development of algae and phanerogams.Differences between fulvic and humic acids are emphasized by the development of polyphenols and protein derivatives in humic acids compared to polysaccharide derivatives in fulvic acids. Other constituents revealed by PY-GC-MS include N-acetyl aminosugars, phthalates and aliphatic compounds. |
| |
Keywords: | pyrolysis-gas chromatography-mass spectrometry humic substances aquatic plants lagoons lakes estuaries |
本文献已被 ScienceDirect 等数据库收录! |
|