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Inorganic colloids in Elbe river water A comparison of methods / Anorganische Kolloide im Wasser der Elbe Methodenvergleich

  • Opel, K.
  • Huettig, G.
  • Zaenker, H.
  • Forschungszentrum Rossendorf e.V. (FZR),...
Publication Date
Jan 01, 2004
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Centrifugation, filtration, PCS, ICP-MS, AAS, SEM and EDX were compared to each other to characterize the inorganic colloids in the Elbe river. The ICP-MS and AAS-analysis of fractions obtained by centrifugation was found to be the most appropriate combination of methods. Thus the water of the Elbe river at Dresden contains inorganic colloids beside suspended matter. The particle size distribution of the colloids covers almost the whole colloidal range (1 nm to 1 #mu#m). They mainly consist of amorphous silicic acid as well as of Fe, Al and Mn oxyhydroxides. The concentration of the inorganic colloids is below 5.10"-"1 mg/l, about 30 times lower than the concentration of the so-called ''suspended matter'' of the Elbe (particles >1 #mu#m). The most important toxic heavy metal they carry is Zn. Because of their high specific surface area, the colloidal particles are not negligible as potential carriers of contaminants in spite of this low mass concentration. In the bulk of a river, colloid-borne contaminants are presumably almost as mobile as truly dissolved contaminants (which is different from the behavior of suspended-matter-borne contaminants). Differences between the transport velocities of colloid-borne trace substances and the transport rates of truly dissolved trace substances are encountered in particular situations in which the water leaves the bulk of a river (seepage region below the river, estuary). Conclusions on the role of colloid particles in the ecological system of a river are drawn and deficiencies of knowledge are indicated. (orig.) / Available from TIB Hannover: RR 1847(395) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische Informationsbibliothek / SIGLE / DE / Germany

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