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Determination of polar organic micropollutants in surface and pore water by high-resolution sampling-direct injection-ultra high performance liquid chromatography-tandem mass spectrometry
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.ORCID iD: 0000-0001-8979-8044
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Number of Authors: 52018 (English)In: Environmental Science: Processes & Impacts, ISSN 2050-7887, E-ISSN 2050-7895, Vol. 20, no 12, p. 1716-1727Article in journal (Refereed) Published
Abstract [en]

Hyporheic zones (HZs) are dynamic and complex transition regions between rivers and aquifers which are thought to play an important role in the attenuation of environmental micropollutants. Non-steady state and small-scale hyporheic processes which affect micropollutants in the HZ are poorly characterized due to limitations in existing analytical methodologies. In this work we developed a method for high spatio-temporal resolution analysis of polar organic micropollutants (POMs) in hyporheic pore- and surface waters by combining (semi-) automatic low volume sampling techniques with direct-injection ultra-high performance liquid chromatography tandem mass spectrometry. The method is capable of quantifying 25 parent compounds and 18 transformation products (TPs) using only 0.4 mL of water and few preparation steps. Application of the method to both surface and pore water revealed significant (i.e. > an order of magnitude) differences in POM concentrations over small time and spatial scales (i.e. < a few hours and tens of cm, respectively). Guanylurea, a TP of the antidiabetic drug metformin was detected at unprecedentedly high concentrations. Collectively, this method is suitable for in situ characterization of POMs at high spatial and temporal resolution and with minimal disturbance of natural flow paths and infiltration of surface water.

Place, publisher, year, edition, pages
2018. Vol. 20, no 12, p. 1716-1727
National Category
Chemical Sciences Earth and Related Environmental Sciences
Research subject
Applied Environmental Science
Identifiers
URN: urn:nbn:se:su:diva-163574DOI: 10.1039/c8em00390dISI: 000453014000008PubMedID: 30350841OAI: oai:DiVA.org:su-163574DiVA, id: diva2:1278468
Available from: 2019-01-14 Created: 2019-01-14 Last updated: 2022-03-23Bibliographically approved
In thesis
1. Transformation of Micropollutants in the Hyporheic Zone
Open this publication in new window or tab >>Transformation of Micropollutants in the Hyporheic Zone
2020 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Hyporheic zones (HZs) are reactive transition regions between rivers and aquifers which are thought to play an important role in the attenuation of micropollutants. Micropollutants are chemical substances such as pharmaceuticals, industrial chemicals or personal care products that are found in trace concentrations in the environment and that can be harmful to organisms. This thesis aimed to narrow the knowledge gap on the environmental fate of wastewater-derived polar organic micropollutants in the aquatic environment, with a specific emphasis on the hyporheic zone.

In Paper I an efficient workflow was developed for the in-situ characterization of polar organic micropollutants and their transformation products (TPs) in the hyporheic zone at high spatial and temporal resolution and with minimal disturbance of natural flow paths. A low volume sampling device was combined with a newly developed high throughput-direct injection-UHPLC-MS/MS method. Application in the field revealed significant differences in micropollutant concentrations that varied over small time- and spatial scales. In Paper II the results of a comprehensive field study performed in the urban lowland river Erpe in Berlin, Germany, are presented. The work provided data on in-situ attenuation behavior of 24 micropollutants and TPs, along with novel insights into the spatially- and temporally varying environmental factors which play a major role in controlling in-stream attenuation of micropollutants. Paper III describes a novel, multi-flume experiment designed to investigate the influence of hyporheic exchange flow and sediment bacterial diversity on dissipation half-lives of 31 micropollutants and associated TPs. Attenuation and transformation of most substances increased significantly with bacterial diversity; fewer compounds responded to both bacterial diversity and hyporheic exchange flow. In addition to the discovery of several novel TPs, a number of bacterial strains were identified that might be associated with micropollutant degradation. In Paper IV the fate of metformin in the hyporheic zone was examined using large-scale (100m) recirculating flumes to perform realistic yet well-controlled experiments. In addition to determining dissipation half-lives in surface and pore water, the formation of novel TPs was investigated via suspect screening and bacterial communities were characterized using microbiological analyses. Data from these experiments indicate that dunes and macrophytes promote hyporheic exchange flow and create reactive environments with steep and varying biogeochemical gradients, which enhanced the degradation of metformin.

Collectively, the fate of 33 parent compounds and 37 transformation products was assessed in field and mesocosm experiments described in this thesis. Additionally, 29 suspected TPs were tentatively identified. Higher bacterial diversity in the hyporheic zone and more intense hyporheic exchange flows significantly enhanced biodegradation of organic micropollutants. A number of known and novel TPs were discovered under diverse conditions, many of which showed signs of environmental persistence, providing further evidence for inclusion of TPs in contaminant risk assessments and regulatory frameworks. This work highlights the importance of considering both small- and reach-scale temporal and spatial variability for a mechanistic understanding of attenuation in in-stream studies.

Place, publisher, year, edition, pages
Stockholm: Department of Environmental Science, Stockholm University, 2020. p. 56
Keywords
micropollutants, hyporheic zone, biodegradation, bacteria, pharmaceuticals, transformation products, LC-MS/MS, macrophytes, bedforms, suspect screening, mesocosm, flume, river
National Category
Environmental Sciences
Research subject
Applied Environmental Science
Identifiers
urn:nbn:se:su:diva-179883 (URN)978-91-7911-038-3 (ISBN)978-91-7911-039-0 (ISBN)
Public defence
2020-04-27, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 10:00 (English)
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Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript.

Available from: 2020-04-02 Created: 2020-03-12 Last updated: 2022-02-26Bibliographically approved

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Posselt, MalteJaeger, AnnaRadke, MichaelBenskin, Jonathan P.

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