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Interactions with freshwater biofilms cause rapid removal of common herbicides through degradation - evidence from microcosm studies

Bighiu, Maria and Goedkoop, Willem (2021). Interactions with freshwater biofilms cause rapid removal of common herbicides through degradation - evidence from microcosm studies. Environmental Science: Processes and Impacts. 23 , 66-72
[Research article]

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Abstract

We investigated the role of periphyton biofilms for the fate of three common herbicides, i.e. bentazone, metazachlor and metribuzin, at low, environmental levels and 100 times higher, during a 16 days laboratory experiment. We found that herbicide water concentrations were stable during the first 8 days, whereas substantial declines (>78%) occurred between days 8-16 for all three herbicides. These rapid declines were explained only to a small extent (<8% of the total herbicide loss) by biofilm sorption. As herbicide concentrations in light and dark treatments without biofilms were similar, and the applied light regimen did not cover the UV-spectrum, herbicide photolysis was ruled out as a possible explanation for the observed declines. Furthermore, based on the compounds' characteristics, also volatilization was judged negligible. Therefore, we conjecture that the observed declines in herbicides were due to biodegradation and subsequent evasion of (CO2)-C-14 that was driven by enzymatic action from heterotrophic microbes. We reason that heterotrophic microbes used herbicide molecules as labile organic C-sources during C-limitation. Future studies should identify the microbial communities and genes involved in biodegradation in order to understand better the role of biofilms for the self-purification of surface waters.

Authors/Creators:Bighiu, Maria and Goedkoop, Willem
Title:Interactions with freshwater biofilms cause rapid removal of common herbicides through degradation - evidence from microcosm studies
Series Name/Journal:Environmental Science: Processes and Impacts
Year of publishing :2021
Volume:23
Page range:66-72
Number of Pages:7
Publisher:ROYAL SOC CHEMISTRY
ISSN:2050-7887
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 3.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 208 Environmental Biotechnology > Water Treatment
URN:NBN:urn:nbn:se:slu:epsilon-p-111291
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-111291
Additional ID:
Type of IDID
DOI10.1039/d0em00394h
Web of Science (WoS)000614604700004
ID Code:23111
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:08 Apr 2021 10:43
Metadata Last Modified:09 Apr 2021 11:42

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