摘要：The concentration and composition of trihalomethanes (THMs) in four swimming pools supplied with sea and fresh water were investigeted, and the variation of THM composition with increasing salinity was revealed by the chlorination experiments in our laboratory. The concentration of THMs ranged from 0.11 to 0.36mg/l in the swimming pools supplied with fresh water and chloroform consisting of 90% THMs. The ratio of chloroform to THMs was significantly higher in the swimming pool water than in the tap water. From the comparison of THM concentration in swimming pool and tap water, it was considered that 0.05-0.3mg of THMs per liter was newly produced during the continious chlorination and recirculation. On the other hand, the swimming pool supplied with sea water contained THMs at levels from 0.05 to 0.08mg/l and most of them consisted of bromoform. In the chlorination experiments, the ratio of chloroform to THMs remarkably decreased as salinity increased. The concentration of bromide ions in the swimming pool water was the most important factor for the composition of THMs.
