Microfabrics of Lacustrine Sediments to Pollutant Adsorption from a Polluted Eutrophic Lake, the Yangtze Delta Region

Two types of microfabrics relating to pollutant adsorption were studied in the scanning electronic microscope (SEM) in a polluted, eutrophic lake, the Yangtze delta region. Agglutinational texture or the aggregates of small particles are composed of clay minerals and fine organic fragments among the...

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Bibliographic Details
Published in:Journal of coastal research 2006-01, p.1412-1417
Main Authors: Yi, C. L., Boyle, J., Rose, N. L., Xie, P.
Format: Article
Language:English
Subjects:
Adsorption
Coatings
Environmental pollution
Lakes
Ocean pollution
Organic pollution
Phosphorus
Sediment contamination
Sediments
Surface texture
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Summary:Two types of microfabrics relating to pollutant adsorption were studied in the scanning electronic microscope (SEM) in a polluted, eutrophic lake, the Yangtze delta region. Agglutinational texture or the aggregates of small particles are composed of clay minerals and fine organic fragments among the silty grains and the coatings with a thickness about 1 μm were on the surfaces of the silty grains in the sediments. The chemical constituents of the aggregates and the coatings are K, Na, Ca, Mg, Si, Al, O, Fe, Ti, C, N and P determined in X-ray energy spectrometry connected with the SEM. In some cases, Pb was detected in the aggregated in the top sediment. It is suggested that nutrients and metals are adsorbed to the aggregates, which were formed by electrostatic attraction of physico-chemical flocs. The coatings on the surface of quartz grains were formed by the interaction of dissociated Al, Si, Fe, etc from silicates with dissolved N, P and C nutrients in interstitial water, which was aroused by human pollution to the lake in recent two decades.
ISSN:0749-0208
1551-5036