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Environmental Sciences Europe
Fig. 6 | Environmental Sciences Europe

Fig. 6

From: A harmonized Danube basin-wide multi-compartment concentration database to support inventories of micropollutant emissions to surface waters

Fig. 6

Heavy metal concentrations (total) in treated wastewater from municipal WWTP in different Danube countries with different treatment technologies implemented. Concentrations are shown as box-whisker plots with values below LOQ imputed by means of ROS under assumption of a lognormal distribution. Notches in the boxes indicate roughly 95% confidence interval for comparing medians. If more than 80% of observations were below LOQ, no boxplot is shown. The range of LOQ is indicated by a red dashed box. The number of observations (N) is shown above each boxplot. The numbers underlaying this figure can be found in Additional file 1

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