Anthropogenic gadolinium as a transient tracer for investigating river bank filtration

Robert Martin Brünjes, Andrea Bichler, Philipp Hoehn, Frank Thomas Lange, Heinz-Juergen Brauch, Thilo Hofmann (Korresp. Autor*in)

    Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed

    Abstract

    The growing use of gadolinium-based contrast agents in magnetic resonance imaging (MRI) leads to an increasing input of anthropogenic gadolinium (Gd anth) into natural environments. Conventional sewage treatment is unable to remove Gd anth and since MRI facilities are mainly used on weekdays the Gd anth inputs to sewage treatment plants are generally higher between Monday and Friday. This transient signal has been traced in both surface water and groundwater through 12-h composite samples collected at high spatial resolutions using depth-discrete rhizon samplers. Propagation of the Gd anth signal from surface water to groundwater was used to calibrate lumped parameter models. Transit time distributions derived for each sampling site revealed mean transit times of between 0.5 and 10 days. Other metrics, such as peak transit time, were shown to correlate better with observed time lags between peak Gd anth concentrations in stream water and groundwater. The relatively stable artificial sweetener acesulfame was investigated as a possible additional sewage indicator, but decreasing concentrations along the flow path indicated its attenuation. We have demonstrated that the ideal tracer Gd anth occurs transiently and can be used to derive groundwater transit times.

    OriginalspracheEnglisch
    Seiten (von - bis)1432-1440
    Seitenumfang9
    FachzeitschriftScience of the Total Environment
    Jahrgang571
    DOIs
    PublikationsstatusVeröffentlicht - 15 Nov. 2016

    ÖFOS 2012

    • 105303 Hydrogeologie
    • 104023 Umweltchemie
    • 104002 Analytische Chemie
    • 105906 Umweltgeowissenschaften

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