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. 2021 Jul 20;413(21):5291–5300. doi: 10.1007/s00216-021-03500-7

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Seasonal distribution of sartans and related compounds in riverbank filtration systems at Ems river (left) and Ruhr river (right) as accumulated relative signal intensities. The highest peak area of each compound was set to 100%. Ea, Ems A; Eb, Ems B; Ra, Ruhr A; Rb, Ruhr B; R, river; B1-B3, groundwater wells; W, abstraction well; Su, summer; Fa, fall; Sp, spring. The asterisk symbol indicates sampling in fall 2017 not possible due to low groundwater table