气候变化领域集成服务门户(CCPortal): 雅鲁藏布江中段表层沉积物重金属形态分布及风险评价

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	雅鲁藏布江中段表层沉积物重金属形态分布及风险评价
其他题名	Chemical Speciation and Risk Assessment of Heavy Metals in the Middle Part of Yarlung Zangbo Surface Sediments
	柏建坤; 李潮流; 康世昌; 陈鹏飞; 王建力
发表日期	2014
ISSN	0250-3301
卷号	35 期号:9 页码:3346-3351
中文摘要	采用了欧共体BCR分步提取的方法,对西藏雅鲁藏布江中段人口密集区的表层沉积物中的9种重金属元素(Cd、 Co、 Ni、 Cu、 Zn、 Pb、 Cs、 As和Cr)不同赋存形态进行了研究,分析了其形态分布特征. 并分别用风险评价编码法(RAC)和沉积物质量基准系数法(SQG-Q)对沉积物重金属生物有效性进行了风险评价. 结果表明:① 元素Cr、 As主要赋存于残渣态(占87%~96%),Ni、 Cu、 Co和Cs赋存特征较为相似,来自非残渣态约占20%,元素Cd酸可提取态和可还原态约占65%,表现出较高的生物毒性; ②由 RAC评估得出元素Cd有效态占37.38%,对环境构成高风险等级,元素Co、 Ni、 Cu和Zn对环境的危害处于低风险状态,元素Pb、 Cs、 As和Cr处于无风险状态,单从重金属形态的生物有效性评价,雅江沉积物对环境构成的风险排序为Cd>Co>Ni>Cu>Zn>Pb>Cs>As>Cr; ③ 沉积物SQG-Q系数为0.804,具有中度的潜在生物毒性效应,鉴于该研究重金属元素主要赋存于残渣态,并且重金属平均含量除元素Cr和Ni外,其余元素均小于TEL和PEL值,所以,该河段总体上处于较低的风险等级,受到人为污染活动较少,污染程度较低.
英文摘要	Nine heavy metals (Cd, Co, Ni, Cu, Zn, Pb, Cs, As, Cr) of surface sediments collected from the Middle Part of the Yarlung Zangbo River were analyzed by BCR sequential extraction procedure. Based on speciation distributions of these metals, ecological risk of heavy metals was assessed with methods of risk assessment code (RAC) and sediment quality guideline quotient (SQG-Q). The results show that: ① Large part of Cr and As belong to residual fraction(87%-96%). Ni, Cu, Co and Cs have similar distribution characteristics(non-residual part accounts for approximate 20%). Correspondingly, mass fraction of Cd exists mainly in acid soluble and reducible faction (65%), indicating high ecological risk level. ② Based on calculation of RAC method, Cd is of high risk to the environment (37.38%). Accordingly, Co, Ni, Cu and Zn are of low risk, and Pb, Cs, As and Cr pose extreme low risk to the environment. According to evaluation of heavy metal speciation distributions, the potential ecological risk of heavy metals is in the descending order of Cd>Co>Ni>Cu>Zn>Pb>Cs>As>Cr. ③ The SQG index of sediments is 0.804, indicating that studied river sediment has a moderate potential biological toxicity effect. Given most of heavy metals exists in residual fraction, the sediments of this region pose a low ecological risk to the environment.
关键词	重金属 BCR方法赋存形态风险评价雅鲁藏布江
英文关键词	heavy metal;BCR sequential extraction procedure;speciation distribution;ecological risk assessment;the Yarlung Zangbo River
语种	中文
来源期刊	环境科学
来源机构	中国科学院西北资源环境生态研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/89659
推荐引用方式 GB/T 7714	柏建坤,李潮流,康世昌,等. 雅鲁藏布江中段表层沉积物重金属形态分布及风险评价[J]. 中国科学院西北资源环境生态研究院,2014,35(9):3346-3351.
APA	柏建坤,李潮流,康世昌,陈鹏飞,&王建力.(2014).雅鲁藏布江中段表层沉积物重金属形态分布及风险评价.环境科学,35(9),3346-3351.
MLA	柏建坤,et al."雅鲁藏布江中段表层沉积物重金属形态分布及风险评价".环境科学 35.9(2014):3346-3351.