摘要
道路沉积物是一重要环境介质,其颗粒物积累的潜在毒性对于城市水体是一重要危害,因此,识别道路沉积物重金属的含量及来源就显得尤其重要.分析了采集于镇江市商业区、河滨公园、居民区和交通繁忙区的62个样品中的Zn、Pb、Cu、Cr和Ni 5种重金属,它们在交通繁荣区含量最大,Zn、Cu、Cr和Ni含量在商业区、河滨公园和居民区并无明显差异.通过主成分分析识别道路沉积物中重金属的来源,发现不同功能区的重金属来源有所差别,各功能区中第一主成分(贡献率70%以上)代表来自交通活动产生的污染源,或者是与工业污染源共同产生的混合污染源;第二主成分代表来自工业污染源或者是生活污染源,并且道路沉积物中重金属与有机质显著相关,最后计算了重金属浓度富集率(CER),以评价人类活动对于重金属污染的影响程度.结果表明,有机质是镇江城市道路沉积物中重金属的重要载体,人类活动对于该地区重金属污染影响达到中等或中等以上的程度.
Road-deposited sediments （RDS） were an important environmental medium which particulates accumulated potentially toxic pollutants, ultimately posing a threat to urban water-bodies, and therefore it was important to recognize sources and concentrations of heavy metal. 62 samples from commercial areas, residential areas, intense traffic areas and riverside park respectively in Zbenjiang were analyzed for Zn,Pb,Cu,Cr and Ni. The results indicated remarkably high levels of five metals in the intense traffic area, whilst Zn,Cu,Cr and Ni did not show any discernible variations in other three areas. Principal component analysis was applied to identify the sources of heavy metal contamination. The first factor （source） spanning the greater amount of variance （70%） should be vehicular source or source of mixed origin including industrial and vehicular, and the second factor should be industrial or life sources. The metals are strongly correlated to the amount of organic matter. Finally, concentration enrichment ratio was used to assess degree of metal contamination affected by anthropogenic. The results showed that organic matter was the carder of heavy metal in RDS and RDS in Zhenjiang had a moderate anthropogenic signals or excess moderate anthropogenic signals.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2007年第7期1584-1589,共6页
Environmental Science
基金
国家高技术研究发展计划(863)项目(2003AA601100)
浅水湖泊治理与资源开发教育部重点实验室开放研究基金项目
关键词
道路沉积物
重金属来源
主成分分析
浓度富集率
road-deposited sediment （RDS）
sources of heavy metal
principal component analysis （ PCA ）
concentration enrichment ratio （CER）
