Impact of persulfate and ultraviolet light activated persulfate pre- oxidation on the formation of trihalomethanes, haloacetonitriles and halonitromethanes from the chlor(am)ination of three antibiotic chloramphenicols /Wenhai Chu a, * , Tengfei Chu a, b , Tom Bond c , Erdeng Du b , Yingqing Guo b , Naiyun Gao - Chu,Wenhai