摘要
用5步提取法分析了锦州湾14个样点沉积物中6种重金属的地球化学形态。结果表明,Cd主要分布在可交换态和碳酸盐结合态;Zn和Pb主要分布于碳酸盐结合态和铁锰氧化态;Cu主要分布在有机硫化物结合态;Cr、Ni主要结合于残渣态中。对Hakanson潜在生态危害指数法作了改进,结合了地球化学形态对生物毒性的影响,得出的生态风险评价结果和次生相与原生相比值法的污染评价结果类似。锦州湾西南角海域生态危害极高,产生生态危害的主要重金属污染物依次为Cd>Zn>Pb>Cu。按风险等级和区域分布将锦州湾划分为4个生态风险功能分区,沿东北方向生态风险随距离增加而减弱。
The speciation distribution and bioavailability of 6 metals in 14 sediment samples from Jinzhou Bay were analyzed by a sequential extraction procedure.The results showed that Cd was predominantly found in the exchangeable and carbonate phase.Pb and Zn were mainly associated with carbonate and Fe-Mn oxidation phase.Cu was higher in organic phase,and Cr and Ni were mainly associated with residual phase.Hakanson s potential risk index method is improved by the considering heavy metals biological toxicity.The r...
出处
《海洋环境科学》
CAS
CSCD
北大核心
2008年第1期54-58,共5页
Marine Environmental Science
基金
国家自然科学基金项目(40301044)
关键词
沉积物
重金属
形态特征
潜在生态风险
锦州湾
sediment
heavy metal
speciation characteristics
potential ecological risk
Jinzhou Bay
