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根据福建兴化湾2006年12月(冬季)和2007年4月(春季)表层海水以及2007年3月表层沉积物的监测资料,分析了该海域表层海水和沉积物中重金属Cu、Pb、Zn、Cd、Hg和As含量的时空变化特征,评价了该海域重金属的污染程度.结果表明:冬季,调查海域表层海水中Cu、Pb、Zn、Cd、Hg、As的含量范围分别为<0.20～2.42、<0.03～1.08、<3.1～16.5、<0.010～0.043、<0.007～0.170、0.82～4.00μg/dm3;春季其含量范围分别为0.91～3.80、0.18～3.40、8.7～36.0、<0.01～0.22、<0.007～0.063、0.63～1.58μg/dm3.这两季表层海水重金属的测值均低于《海水水质标准(GB 3097-1997)》第二类标准值,其中春季Cu、Pb、Zn、Cd含量的均值高于冬季,可能与陆源重金属污染物入海的影响有关.兴化湾表层沉积物中Cu、Pb、Zn、Cd、Hg和As的含量范围分别为7.60～22.00、22.4～39.1、54.2～114.0、0.045～0.082、0.020～0.066、5.00～10.20 mg/kg,均低于《海洋沉积物质量(GB 18668-2002)》的第一类标准值.该湾表层海水和沉积物中重金属含量的平面分布特征呈近岸海域较高.此外,对其历年来监测结果的比较表明,兴化湾表层海水和沉积物中Cu和Pb含量的多次监测值较接近,但重金属Zn含量的监测值存在着波动现象.
According to the monitoring data of surface seawater in December 2006 (winter) and April 2007 (spring) of Xinghua Bay in Fujian Province and surface sediments in March 2007, the contents of heavy metals Cu, Pb, Zn Pb, Zn, Cd, Hg and As in the surface waters of the survey area in winter were respectively calculated as <0.20 ~ 2.42, <0.03 ~ 1.08, <3.1 ~ 16.5, <0.010 ~ 0.043, <0.007 ~ 0.170,0.82 ~ 4.00μg / dm3 in spring. The contents ranged from 0.91 to 3.80, from 0.18 to 3.40, from 8.7 to 36.0, 0.22, <0.007 ~ 0.063 and 0.63 ~ 1.58μg / dm3, respectively.The measured values of heavy metals in surface seawater of these two seasons were lower than the second standard values of “seawater quality standard (GB 3097-1997) , And the average Cd content was higher than that in winter, which may be related to the impact of terrestrial heavy metal pollutants into the sea.The content of Cu, Pb, Zn, Cd, Hg and As in the surface sediments of Xinghua Bay ranged from 7.60 to 22.00 and from 22.4 to 39.1 , 54.2 ~ 114.0,0.045 ~ 0.082,0.020 ~ 0.066,5.00 ~ 10.20 mg / kg, all lower than that of ”Ocean Sediment quality (GB 18668-2002). "The surface distribution of heavy metals in the surface seawater and sediment of the bay is characterized by a high level of nearshore sea area. In addition, the comparison of monitoring results over the years shows that, The multiple monitoring values of Cu and Pb in the surface seawater and sediments of Xinghua Bay are close, but the monitoring value of heavy metal Zn content fluctuates.