广州海域环境质量评价

根据2003年8月至2004年8月的水质调查数据，运用水质质量单项标准指数法、综合指数WQI法和富营养化评价法，对广州海域环境质量进行评价.结果表明，广州海域主要污染物质为DIN、PO₄^3--P、油类、Cu和Pb，其年平均浓度分别为1.87 mg·L^-1、0.049 mg·L^-1、0.107 mg·L^-1、6.07 μg·L^-1和1.43 μg·L^-1.其中，DIN的污染情况最严重，所有监测站位DIN含量均超过四类海水水质标准，其平面分布呈现从湾内向湾外递减的特征.受珠江径流和陆源排污等的影响，广州海域大部分处于重度污染，且严重富营养化，其单项污染指数、综合污染指数和富营养化指数的平均值分别为2.22、6.80和48.44，表现为从湾内向湾外递减的趋势，高值区均出现在黄埔港至狮子洋海域.

Environmental quality of Guangzhou sea area

Based on the water quality investigation data from August 2003 to August 2004, and by using single water quality parameter model, integrated water quality index model and eutrophication assessment model, this paper assessed the environmental quality of Guangzhou sea area. The results showed that the key pollutants were dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus, oil, Cu and Pb, with their annual average concentrations of 1.87 mg x L(-1), 0.049 mg x L(-1), 0.107 mg x L(-1), 6.07 microg x L(-1) and 1.43 microg x L(-1), respectively. Among the pollutants, DIN was the most important one. Its concentration exceeded the fourth standard of sea water quality, and decreased gradually from inner bay to outer bay. Under the effects of Pearl River water flow and land-based pollutants, most part of Guangzhou sea area was seriously polluted, and the annual averages of single parameter pollution index, integrated water quality index, and eutrophication index were 2.22, 6.80 and 48.44, respectively, which also decreased gradually from inner bay to outer bay, and from nearshore to offshore.