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Reactive transport of iomeprol during stream-groundwater interactions

Engelhardt, Irina and Prommer, Henning and Schulz, Manoj and Vanderborght, Jan and Schüth, Christoph and Ternes, Thomas A. (2014):
Reactive transport of iomeprol during stream-groundwater interactions.
In: Environmental Science and Technology, American Chemical Society, pp. 199-207, 48, (1), ISSN 15205851, DOI: 10.1021/es403194r, [Online-Edition: http://pubs.acs.org/doi/10.1021/es403194r],
[Article]

Abstract

The transport and biochemical transformations of the iodinated X-ray contrast medium (ICM) iomeprol were studied at the stream/groundwater interface. During a one-month field experiment piezometric pressure heads, temperatures, and concentrations of redox-sensitive species, iomeprol and 15 of its transformation products (TPs) were collected in stream- and groundwater. The data set was analyzed and transformation processes and rates identified by comparing conservative and reactive transport simulations. ICM and TP transformations were simulated as a cometabolic process during organic carbon degradation. Using iomeprol/TPs ratios as calibration constrain mitigated the uncertainties associated with the high variability of the ICM wastewater discharge into the investigated stream. The study provides evidence that biodegradation of ICM occurs at the field-scale also for predominantly denitrifying conditions. Under these anaerobically dominated field conditions shortest simulated half-life (21 days) was in the same range as previously reported laboratory-determined half-lives for aerobic conditions.

Item Type: Article
Erschienen: 2014
Creators: Engelhardt, Irina and Prommer, Henning and Schulz, Manoj and Vanderborght, Jan and Schüth, Christoph and Ternes, Thomas A.
Title: Reactive transport of iomeprol during stream-groundwater interactions
Language: English
Abstract:

The transport and biochemical transformations of the iodinated X-ray contrast medium (ICM) iomeprol were studied at the stream/groundwater interface. During a one-month field experiment piezometric pressure heads, temperatures, and concentrations of redox-sensitive species, iomeprol and 15 of its transformation products (TPs) were collected in stream- and groundwater. The data set was analyzed and transformation processes and rates identified by comparing conservative and reactive transport simulations. ICM and TP transformations were simulated as a cometabolic process during organic carbon degradation. Using iomeprol/TPs ratios as calibration constrain mitigated the uncertainties associated with the high variability of the ICM wastewater discharge into the investigated stream. The study provides evidence that biodegradation of ICM occurs at the field-scale also for predominantly denitrifying conditions. Under these anaerobically dominated field conditions shortest simulated half-life (21 days) was in the same range as previously reported laboratory-determined half-lives for aerobic conditions.

Journal or Publication Title: Environmental Science and Technology
Volume: 48
Number: 1
Publisher: American Chemical Society
ISBN: 0013-936X
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Hydrogeology
Date Deposited: 17 Apr 2018 12:32
DOI: 10.1021/es403194r
Official URL: http://pubs.acs.org/doi/10.1021/es403194r
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