摘要
利用围隔式生态实验装置研究了加拿大False河口污染沉积物中重金属Pb、Zn、Cd、Cu在海水环境中的行为。实验模拟了 4种环境条件 :( 1)高生产力 ;( 2 )低生产力 ;( 3 )高悬浮物含量 ;( 4 )还原环境。结果表明 ,污染沉积物中重金属在海水环境中的行为既取决于元素自身性质 ,亦受外界环境条件制约。还原环境能抑制重金属的释放 ,有助于体系中原有的重金属清除出水柱。低生产力条件下 ,Pb、Zn表现出释放行为 ,而高生产力和高悬浮物含量条件下 ,Pb、Zn表现出先释放后迁移 ,而Cd、Cu则呈现出相反的图象。研究了实验期间 4种重金属释放与迁移的净通量 ,表明氧化条件下Cu、Zn净释放通量比Cd、Pb高 1～ 2个量级。研究表明 。
Behaviors of heavy metals (Pb, Zn, Cd and Cu) from polluted sediments (False Creek, Canada)in seawater environment were investigated in the marine ecosystem enclosure experiment (MEEE). Four basic environments were simulated: (1) high productivity; (2)low productivity; (3)high silt load; (4) anoxia. Results showed that behaviors of heavy metals depended on their chemical natures and environmental conditions within the enclosures. In anoxic condition, release of four metals was prohibited; in contrary, these metals in the original system were also removed from the water column. Pb and Zn were released in lower primary productivity condition, while they showed release during the earlier stage of the experiment and then remove out of water column afterwards in higher primary productivity and high silt load conditions. Cd and Cu, in contrast with Pb and Zn, showed an opposite tendency. In oxidative conditions, release fluxes of Cu and Zn were 1～2 orders of magnitude higher than Cd and Pb. The work suggested that clay adding and dumping in anoxic environment could helpful in alleviating the secondary pollution of heavy metals after ocean dumping of dredged spoils.
出处
《台湾海峡》
CAS
CSCD
2000年第3期276-283,共8页
Journal of Oceanography In Taiwan Strait
基金
国家海洋局和加拿大国际发展研究中心共同资助
