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Hyporheic exchange controls fate of trace organic compounds in an urban stream

Title data

Schaper, Jonas ; Posselt, Malte ; McCallum, James L. ; Banks, Eddie W. ; Höhne, Anja ; Meinikmann, Karin ; Shanafield, Margaret ; Batelaan, Okke ; Lewandowski, Jörg:
Hyporheic exchange controls fate of trace organic compounds in an urban stream.
In: Environmental Science & Technology. Vol. 52 (2018) Issue 21 . - pp. 12285-12294.
ISSN 0013-936X
DOI: https://doi.org/10.1021/acs.est.8b03117

Abstract in another language

First-order half-lives for 26 trace organic compounds (TrOCs) were determined in the hyporheic zone (HZ) and along a 3 km reach of a first-order stream in South Australia during both dry and wet seasons. Two salt tracer experiments were conducted and evaluated using a transient storage model to characterize seasonal differences in stream residence time and transient storage. Lagrangian and time-integrated surface water sampling were conducted to calculate half-lives in the surface water. Half-lives in the HZ were calculated using porewater samples obtained from a modified mini-point sampler and hyporheic residence times measured via active heat-pulse sensing. Half of the investigated TrOCs (e.g., oxazepam, olmesartan, candesartan) were not significantly removed along both the investigated river stretch and the sampled hyporheic flow paths. The remaining TrOCs (e.g., metformin, guanylurea, valsartan) were found to be significantly removed in the HZ and along the river stretch with relative removals in the HZ correlating to reach-scale relative removals. Using the modeled transport parameters, it was estimated that wet season reach-scale removal of TrOCs was predominately caused by removal in the HZ when the intensity of hyporheic exchange was also higher. Factors that increase HZ exchange are thus likely to promote in-stream reactivity of TrOCs. Please note that an open access post-print version of this manuscript will be available after an embargo period here.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER150295
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology > Chair Hydrology - Univ.-Prof. Dr. Stefan Peiffer
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 25 Apr 2019 05:53
Last Modified: 25 Apr 2019 05:53
URI: https://eref.uni-bayreuth.de/id/eprint/48250