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Aquatic Geochemistry

, Volume 16, Issue 1, pp 85–100 | Cite as

Influence of NOM on the Mobility of Metal(loid)s in Water-Saturated Porous Media

  • George Metreveli
  • Gudrun Abbt-Braun
  • Fritz Hartmann FrimmelEmail author
Original Paper

Abstract

In this work, the interaction of natural organic matter (NOM) with metal(loid)s (Cu, Pb, Zn, Pt, As) and the role of NOM on the metal(loid) transport in a water-saturated quartz sand column were investigated. For detailed information, size exclusion chromatographic (SEC) measurements and “short pulse” laboratory transport experiments with online metal(loid) and NOM detection were used. The SEC measurements showed the formation of metal–NOM complexes. Cu, Pb, Zn and Pt were predominantly bound to the high molecular mass NOM molecules. The binding capacity of the NOM for metals increased with increasing pH value and in the following order: Zn < Pb < Cu < Pt. No evidence for the formation of As–NOM complexes was found. The transport experiments showed no significant influence of NOM on the mobility of Cu, Pb and Zn. The metal–NOM complexes detected in the SEC experiments were obviously sorbed completely onto the grain surfaces in case of the quartz sand system, or they were dissociated partially during passage through the column. No influence of NOM was observed on the transport of As as well. Inorganic Zn and As species were transported through the column with increasing retardation as the pH value increased. Pt showed a high mobility at a pH of 5, and it decreased at a pH of 7 especially in the presence of NOM. The results support the known fact that a decrease in the pH value results in enhanced transport of inorganic metal(loid) species in water-saturated porous media. On the other hand, the presence of NOM can immobilise the metals through metal–NOM complex formation and the deposition of the complexes onto the stationary phase.

Keywords

NOM Metal(loid)s SEC Transport experiments Porous media 

Notes

Acknowledgments

The authors thank the German research council (DFG) for financial support within the Graduiertenkolleg 366 and KORESI project (colloidal transport of substances by seepage of rainwater, FR 536/29). Joachim Krenn and Reinhard Sembritzki are gratefully acknowledged for their fine experimental work and ICP-MS measurements.

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • George Metreveli
    • 1
  • Gudrun Abbt-Braun
    • 1
  • Fritz Hartmann Frimmel
    • 1
    Email author
  1. 1.Chair of Water Chemistry, Engler-Bunte-InstituteUniversität Karlsruhe (TH)KarlsruheGermany

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