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目的了解珠江广州段河涌和前航道某断面水质的卫生状况以及涨、退潮对水质的影响,探讨在珠江游泳的可行性。方法于2007年7月1—15日珠江游泳期间,分别于涨、退潮时对珠江广州段河涌和前航道某断面河水进行采样和检测,检测指标包括pH值、浑浊度、溶解氧、耗氧量、氨氮和粪大肠菌群。结果分别采集珠江广州段河涌水水样54件、前航道某断面水水样40件。河涌水和某断面河水的水质检测结果显示,pH值和耗氧量指标均合格,而氨氮、溶解氧和粪大肠菌群指标均不合格,且浑浊度较高,不符合GB9667—1996《游泳场所卫生标准》的要求;涨潮时河涌水和前航道某断面河水的耗氧量低于退潮时,差异均有统计学意义(P<0.05或P<0.01)。结论珠江广州段河涌和前航道某断面水质污染较重,涨潮时的水质优于退潮时;选定作为游泳点的珠江前航道某断面水质尚达不到作为游泳区的标准。
Objective To understand the sanitary status of water quality of a section of creek and section of Pearl River in Guangzhou section and the effect of rising and falling tide on the water quality and to explore the feasibility of swimming in the Pearl River. Methods During the Pearl River Swim between July 1-15, 2007, the rivers of Guangzhou section of the Pearl River and the section of the former fairway were sampled and tested during rising and falling tide respectively. The detection indexes included pH value, turbidity, dissolved oxygen, consumption Oxygen, ammonia nitrogen and fecal coliform. Results A total of 54 river water samples collected from the Guangzhou section of the Pearl River and 40 water samples from a section of the former channel were collected. River water and a section of river water quality test results show that the pH and oxygen consumption indicators are qualified, and ammonia nitrogen, dissolved oxygen and fecal coliform indicators are not qualified, and the turbidity is high, does not meet the GB9667-1996 “swimming Place sanitation standard ”. The difference of oxygen consumption of river water of a river section and water of a section of the former channel at high tide was lower than that at low tide (P <0.05 or P <0.01). Conclusions The water quality of a section of the Pearl River in Guangzhou section of the river creek and the former channel is heavy, and the water quality at high tide is better than that at low tide. The water quality of a section of the Pearl River navigation channel selected as a swimming point still fails to reach the standard of swimming area.