Formation of brominated products in irradiated titanium dioxide suspensions containing bromide and dissolved organic carbon.
We report the irradiation of TiO(2) suspensions containing Br(-) and dissolved organic carbon (DOC). In the absence of DOC, we found no evidence for the formation of BrO(3)(-) upon irradiation of 1gL(-1) P25 suspensions with UV light for initial Br(-) concentrations up to 10mgL(-1). In the presence of DOC (Lake Hohloh, Germany and salicylic acid), we found no evidence for the formation of either BrO(3)(-) or trihalomethanes (THMs). However, small amounts of adsorbable organic halogen (AOX) were formed at high bromide concentrations (3mgL(-1)). 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 10microgL(-1)). Bromoform appeared only after the DHBA had been degraded.
Tercero Espinoza
Luis A
LA
Engler-Bunte-Institut, Universität Karlsruhe (TH), Engler-Bunte-Ring 1, 76131 Karlsruhe, Germany. luis.tercero@ebi-wasser.uni-karlsruhe.de
Frimmel
Fritz H
FH
D001966:Bromine / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D002853:Chromatography, Liquid; D012995:Solubility; D014025:Titanium / Q000737:chemistry*
C009495:titanium dioxide; D002244:Carbon; D014025:Titanium; D001966:Bromine