摘要
2009年4月、8月、11月和12月分别对辽东湾北部海域海水和沉积物中的重金属Pb和Cd进行取样分析,并对分析结果进行评价。结果表明,辽东湾北部海域海水中Pb的季节分布特征为:春季>秋季>冬季>夏季,Cd含量随季节变化差别不大。Pb和Cd的空间分布特征总体为近岸高,离岸低,由近岸向离岸方向递减。辽东湾北部海域水体中Pb污染程度高于Cd,春季调查海域有71.9%的站位Pb含量超出二类海水水质标准值,四个季节Cd的含量均在二类水质标准值范围内。春季和冬季辽东湾北部海域沉积物中Pb的含量均较高,且冬季高于春季,而Cd的季节变化特征亦不明显。沉积物中Cd的污染程度高于Pb,四个季节调查海域沉积物中Pb的含量均未超出一类海洋沉积物质量标准值,属轻微生态危害。而Cd均有部分站位超出一类海洋沉积物质量标准值,大多数超标站位Cd的单项潜在生态危害系数介于40～80之间,属中等生态危害。
The concentrations of Pb and Cd in the water and sediment in the north area of Liaodong Bay were collected and analyzed in Apr.,Aug.,Nov.and Dec.of 2009.The order of seasonal distribution of Pb concentration was spring autumn wintersummer.And Cd was not the distinct spatial pattern.The Pb and Cd concentration in water were decreased with the increasing distance from the land and it showed a typical diffusion pattern from land to sea.The pollution of Pb in the water was more serious compared with the pollution of Cd.In spring,and 71.9% of Pb was beyond the national standard degree Ⅱ for seawater.Cd in four seasons were all within the normal range of the national standard degree Ⅱ for seawater.The Concentrations of Pb were high in the sediment in spring and winter,but higher in winter than in spring.Also concentration distribution of Cd in the sediment was not the significant seasonal variation.In the sediment,the pollution of Cd was more serious than Pb.Pb concentrations were all within the marine sediment quality standard for Grade 1,which belonged to the light potential ecological risk level.Some of Cd concentrations is higher than the marine sediment quality standard for Grade Ⅰ.All in all,Cd belonged to the medium potential ecological risk level,and the potential ecological risk index is between 40 and 80 at most sample stations.
出处
《海洋环境科学》
CAS
CSCD
北大核心
2011年第6期780-783,788,共5页
Marine Environmental Science
基金
海洋公益性行业科研专项经费项目(200805069)
国家自然科学基金(40806002)
国家海洋局青年基金(2010509
2008217)
关键词
辽东湾
PB
CD
时空分布特征
污染风险评价
Liaodong Bay
Pb
Cd
spatio-temporal distribution
pollution risk assessment
