Formation of brominated products in irradiated titanium dioxide suspensions containing bromide and dissolved organic carbon

We report the irradiation of TiO2 suspensions containing Br- and dissolved organic carbon (DOC). In the absence of DOC, we found no evidence for the formation of upon irradiation of P25 suspensions with UV light for initial Br- concentrations up to . In the presence of DOC (Lake Hohloh, Germany and salicylic acid), we found no evidence for the formation of either or trihalomethanes (THMs). However, small amounts of adsorbable organic halogen (AOX) were formed at high bromide concentrations ( ). When irradiating P25 suspensions containing bromide and 2,4-dihydroxybenzoic acid (DHBA, high bromoform formation potential), we observed the formation of significant amounts of bromoform (up to ). Bromoform appeared only after the DHBA had been degraded.