Abstract
The objective of this study was to assess the current chemistry of trace elements in upland headwater lakes in Ireland and determine their trends during the last decade in response to decreasing emissions. Twenty-nine upland lakes were sampled in 2017–2018; 19 were previously sampled in 2007–2008. The 2017–2018 samples were analyzed for conductivity, pH, DOC, and 18 trace elements. The lakes had low element concentrations; only 7 of 18 trace elements were > 1 µg/L (Fe, Al, Zn, Mn, B, Sr and Ba). Nine elements were assessed for significant decadal changes; four elements decreased (B, Co, Mn, and Sr) and one increased (Pb). Their correlation with conductivity, pH, and DOC and the associated changes in those variables partially explained the observed trends. In general, elements that were correlated with DOC did not decrease, while those that were not correlated decreased between the two periods. Despite decreased anthropogenic emissions, ecosystem recovery and climate perturbations can confound or mask the benefits of emissions reductions.
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Acknowledgements
Financial support for this research was provided by the Irish Environmental Protection Agency under the Climate Change Research Programme (CCRP) 2014–2020 (Grant No. 2016-CCRP-MS.43).
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Nelson, S.A.M., Aherne, J. Decadal Changes in Trace Metal Concentrations in Upland Headwater Lakes. Bull Environ Contam Toxicol 105, 679–684 (2020). https://doi.org/10.1007/s00128-020-02984-w
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DOI: https://doi.org/10.1007/s00128-020-02984-w