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Alongside these specific issues, there is also concern about the role pesticides may play in mixture toxicity. Existing environmental quality standards apply to single substances but in the environment, organisms are exposed to chemical mixtures. We know little about the combined effects of such mixtures but there is a risk that chemicals could combine to reach harmful levels (EFSA, 2019; EEA, 2018a; Busch, 2016; Kortenkamp, et al., 2009b). Given the uncertainty but the knowledge that pesticides are harmful to at least part of an ecosystem, application of the precautionary approach would seem appropriate.
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Maybe to reshape last sentence to be clearer.
Regarding this paragraf maybe to conclude that since we know little about impact of mixtures, they are not in scope of this report. Or to add in chapter 2.2 - last sentence: "Other chemicals and mixtures which may be present in the water are out of scope of this technical report".
the last sentence of this paragraph is out of the scope of this report, which shoudl be factual and refer to results.
Last sentence: EQS are already precautionary with high safety values. These are able to cover any mixture effects.