Figure 4.

(a) Bromate formation as a function of the ozone exposure for five ozonation conditions. Unaltered Lake Zurich water contained 1.4 mgC/L DOC, 2 μM bromide, 1 mM phosphate buffer (pH 7.6), 5 μM pCBA, and a 60 μM ozone dose (black four pointed stars). The other conditions additionally contained 10 μM formate (orange circles), 4 μM ammonium (blue diamonds), 7 μM NH₂Cl (green squares), or 15 μM NH₂Cl (red triangles), respectively. (b) A close-up for a low range of ozone exposures (dotted rectangle in a). The slopes of the first three data points are provided in Table 2.