Fig. 5From: Mixture toxicity in the Erft River: assessment of ecological risks and toxicity driversMixture toxicity of different herbicides in the Erft tributary Swist in 2016/2017. The SUM TU of 18 herbicides calculated based on the acute toxicity data is shown for algae. Red line indicates the threshold of potential acute mixture risks (SUM TUacute ≥ 0.01)Back to article page