标题：Chemical Changes of Organic Compounds in Chlorinated Water. XV. The Concentrations and Compositions of Halogenated Organics Formed during Chlorination of Water from the Tama River
摘要：Water samples collected from the Tama River were treated with chlorine under the conditions utilized for water renovation, in order to characterize and determine the halogenated organics formed in this reaction. Non-chlorinated water samples showed total trihalomethanes (THMs) and total organic halogen (TOX) levels ranging from 0.4 to 12.2μg/l (mean value, 4.1μg/l) and from 7 to 51.5μg/l (mean value, 25.9μg/l), respectively. It was found that the concentrations and compositions of organic halogen in chlorinated river water are strongly dependent on the sampling points and periods. The ranges of total THMs and TOX levels in chlorinated river water were from 2 to 158μg/l (mean value, 33.1μg/l) and 12 to 400μg/l (mean value, 151μg/l), respectively. Higher concentrations of both THMs and TOX and a high ratio of brominated THMs to total THMs were found on chlorination of water samples taken from the midstream of the Tama River, as compared with those observed from the upstream region. The concentrations of both THMs and TOX in chlorinated river water increased during spring and summer and decreased during fall and winter. In addition, the amounts of THMs and TOX in chlorine-treated river water were found to be dependent on the pH of the solutions and the time of contact with chlorine.
