Fig. 3From: Arsenic metabolism in technical biogas plants: possible consequences for resident microbiota and downstream unitsQuantification of the As species in the liquid phase (top) and the produced gas (bottom) of four selected technical plants. The x-axis assigns the plants (numbering as indicated in Table 1). In the liquid phase, only the dissolved (ionic) species were analyzed. Volatile species were only analyzed in the gas phaseBack to article page