摘  要为了解京杭大运河支流余杭塘河沉积物重金属的污染特征及潜在危害程度，测定了83个采样点枯水期和丰水期沉积物中铜（Cu）、锌（Zn）、铅（Pb）、镉（Cd）等四种重金属元素的含量。结果表明：（1）四种重金属含量在时空上都表现不同的差异性，无论是丰水期还是枯水期，余杭塘河沉积物中Cu、Zn的含量均高于浙江省土壤环境背景值，Cd的含量低于背景值，Pb在丰水期上游（第I段）高于背景值，枯水期低于背景值。（2）余杭塘河沉积物重金属的潜在生态危害程度属于轻微级别，Cu是对余杭塘河生态环境具有潜在影响的重金属元素，仍需警惕。（3）在枯水期阶段，Pb与Cu、Zn有着显著的相关性，在丰水期阶段，Cu与Zn、Pb具有显著的相关性，表明它们的来源可能相同。在杭州未来科技城的建设与运行过程中，还需要对这些重金属污染加以防范和预防。89669

Abstract In order to understand the contamination characteristics and ecological risk of heavy metals in the sediments of Yuhangtang River, the tributary of Beijing-Hangzhou Grand Canal, copper (Cu), zinc (Zn), lead (Pb), cadmium (Cd) in 83 sediments samples were measured in the dry season (January) and the wet season (July)。 The results showed that: (1) Spatiotemporal differences were found for the concentrations of all the four heavy metals。 The concentrations of Cu and Zn in the sediments of Yuhangtang River are higher than the values of soil environmental background of Zhejiang Province, both in wet and dry season。 Cd concentration is lower than the background value, while Pb concentration (upstream) is higher than the background value in the wet season and lower in the dry season。 (2) There is a light potential ecological risk for heavy metals in the sediments of Yuhangtang River, and Cu is the element with potential ecological risk to Yuhangtang River。 (3) According to the correlation analysis, Pb, Cu and Zn concentrations are correlated to each other in the dry season, while Cu, Zn and Pb have a significant correlation in the wet season, indicating that these heavy metals come from the same source likely。 It is necessary to prevent these heavy metals pollution in the construct and operate of Hangzhou Future Sci-Tech City。 

毕业论文关键词：重金属; 沉积物分布特征; 潜在生态危害; 相关性溯源; 余杭塘河

Key words: heavy metals; distribution characteristics in sediments; Potential ecological risk; correlation-traceability; Yuhangtang River

目录

0 引言 4

1 方法 5

1。1研究区概况 5

1。2 样点分布及样品采集 6

1。3 分析方法 7

1。4 重金属评价方法 7

1。5 数据分析 8

2 结果与分析 9

2。1 沉积物重金属的时空分布源Q于W优E尔A论S文R网wwW.yOueRw.com 原文+QQ75201,8766 特征 9

2。2 潜在生态危害评价 10

2。3沉积物各指标的相关性分析 12

3 讨论 13

3。1 余杭塘河重金属污染现状 13

3。2 余杭塘河沉积物重金属污染潜在生态危害评价 13

3。3 余杭塘河重金属污染来源探析 14

3。4 余杭塘河重金属污染生态维持措施建议 14

4 结论