2016年北部湾近岸海域海水环境质量评价

Annual Assessment of Seawater Quality of Beibu Gulf in 2016

根据北部湾近岸海域2016年3、5、8、10月4个航次的海水水质监测数据,应用单因子法、有机污染指数法和富营养化指数法对该海域海水的质量状况进行了评价分析,以及应用综合污染指数法分析讨论了该海域8月份表层海水中7种重金属的含量分布特征及污染评价。结果表明:pH、DO、COD、PO_(43-)-P和DIN均存在不同程度的超标,其中各指标在钦州湾内、防城湾内、廉州湾内和大风江入海口超标比较明显。调查海域10月的海水水质状况优于其他月份(3月、5月和8月)。各站位重金属综合污染指数在0.31～0.62范围区间,重金属综合污染程度低,总体属清洁水平。

Based on the monitoring data of Beibu Gulf seawater quality collected in four cruises in March, May, August and October, 2016, we used single factor, index of organic pollution and eutrophication level methods to analyze and evaluate the coastal seawater quality. The distribution characteristics and pollution assessment of 7 heavy metals in surface seawater in August were analyzed using the comprehensive pollution index method. The results showed that the pH value and the concentrations of DO, COD, PO43--P and DIN exceeded the standards at different degrees. The acidity(pH) and the pollution degrees of DO, COD, PO43--P and DIN were aggravated in Qinzhou, Fangcheng and Lianzhou inner bays and Dafeng River. The seawater quality of the investigated sea area in October was better than that in other months(March, May and August).The heavy metal pollution index ranged from 0.31 to 0.62 and integrated pollution assessment of heavy metals was clean in term of level.