水力扰动对河口沉积物中重金属再释放的影响

CORC > 烟台海岸带研究所 > 中国科学院烟台海岸带研究所 > 山东省海岸带环境工程技术研究中心

	水力扰动对河口沉积物中重金属再释放的影响
	柳肖竹 1,2; 刘群群 1,2; 王文静 1; 盛彦清 1
刊名	生态与农村环境学报
	2020
卷号	36 期号:11 页码:1460-1467
关键词	河口沉积物再悬浮二次悬浮重金属
ISSN号	1673-4831
其他题名	Effect of Hydraulic Disturbance on Re-release of Heavy Metals in Estuarine Sediments
文献子类	Article
英文摘要	Sediment re-suspension caused by hydraulic disturbances may result in the release of heavy metals from the sediments,producing potential environmental risks. In order to investigate the effects of first and secondary suspension on releases of Cu,Cd,and Cr in estuarine sediments,a series of experiments were performed by simulated hydraulic disturbances. Based on the incipient motion of sediment transportation,three disturbance intensities with 100,160,and 240 r·min~(-1) were conducted. The results indicate that disturbance could cause the large-size particles to be broken into small-size particles,increasing the clay proportion in sediment. After suspension,the heavy metals in sediment would be released again into the overlying water. The peak values of Cu in the overlying water reached 36 mug·L~(-1) under 240 r·min~(-1). However, Cd release peaked at low disturbance (100 r·min~(-1)),which was higher than those under 160 and 240 r·min~(-1). Cu in sediment was dominated by acid fraction (49.3%) and residue fraction (30.5%),while Cd was dominated by acid fraction (68.2%) with the shortest time to peak concentration in overlying water compared to other metals. For Cr,residual fraction was the dominant one (82.7%),which was relatively stable,so the release variations kept in a narrow range under three different disturbances intensities. After the first suspension,all heavy metals presented continuous release tendency. However,the peak concentration of Cu after secondary suspension was higher than that in first suspension,while contrary phenomena were observed for Cd and Cr,suggesting Cu release was sensitive to secondary suspension. The result of heavy metal fractions suggests that heavy metal release would be greatly influenced by their geochemical fractions. Overall,acid fraction presented high sensitivity to disturbances,and intensive disturbances enhanced the oxidation of the oxidation fraction heavy metals,increasing the potential risk of heavy metal release.
语种	中文
CSCD记录号	CSCD:6853124
资助机构	国家自然科学基金 ; 山东省重点研发计划
内容类型	期刊论文
源URL	[http://ir.yic.ac.cn/handle/133337/30320]
专题	烟台海岸带研究所_山东省海岸带环境工程技术研究中心
作者单位	1.中国科学院烟台海岸带研究所山东省海岸带环境工程技术研究中心,山东烟台264003; 2.中国科学院大学,北京100049
推荐引用方式 GB/T 7714	柳肖竹,刘群群,王文静,等. 水力扰动对河口沉积物中重金属再释放的影响[J]. 生态与农村环境学报,2020,36(11):1460-1467.
APA	柳肖竹,刘群群,王文静,&盛彦清.(2020).水力扰动对河口沉积物中重金属再释放的影响.生态与农村环境学报,36(11),1460-1467.
MLA	柳肖竹,et al."水力扰动对河口沉积物中重金属再释放的影响".生态与农村环境学报 36.11(2020):1460-1467.