• 关键词：城市河流  重金属  形态  Pb-Zn-Cu同位素组成  空间分布

• 基金项目：国家自然科学基金（No.41301336）；河南省科技攻关项目（No.172102110007）

• 陈志凡
• 1. 黄河中下游数字地理技术教育部重点实验室(河南大学), 开封 475004;2. 河南大学环境与规划学院, 开封 475004

• 徐薇
• 1. 黄河中下游数字地理技术教育部重点实验室(河南大学), 开封 475004;2. 河南大学环境与规划学院, 开封 475004

• 化艳旭
• 1. 黄河中下游数字地理技术教育部重点实验室(河南大学), 开封 475004;2. 河南大学环境与规划学院, 开封 475004

• 裴锦程
• 1. 黄河中下游数字地理技术教育部重点实验室(河南大学), 开封 475004;2. 河南大学环境与规划学院, 开封 475004

• 杨玉洁
• 河南大学环境与规划学院, 开封 475004

• 摘要：分析了开封市不同区位3条代表性河流底泥样品中重金属总量及形态.采用改进的Hakanson潜在生态风险指数法评价了不同区位河流底泥的污染情况.使用MC-ICP-MS分析了Pb、Zn和Cu的稳定同位素组成，并基于此尝试解析底泥中重金属污染来源.结果表明：①开封城市河流底泥各重金属含量均超过环境背景值，重金属污染以Cd最为严重，其次为Zn、Cu、Pb、As、Cr和Ni.位于老工业区的化肥河底泥中重金属的平均含量明显高于老城区和新开发区.②从形态分布来看，开封城市河流底泥重金属Cd和Zn的生物有效态含量最高，具有较高的潜在风险.老工业区河流底泥中重金属的生物有效态含量高于老城区及新开发区.③潜在生态风险评价结果表明，位于老工业区的化肥河底泥重金属污染表现为很强生态风险程度的V等级，位于老城区的黄汴河和新开发区的马家河则均表现为强生态风险程度.④基于Pb-Zn-Cu同位素组成表明，老工业区底泥重金属主要来自工业活动，老城区黄汴河和新开发区马家河重金属主要来自生活污水的排放及城市地表径流.

• Abstract：The sediment samples were collected from three representative rivers in different areas of Kaifeng City, and the total amount and chemical forms of heavy metals were analyzed. Based on the Nemerow pollution index method, the improved Hakanson potential ecological risk index method was used to analyze the heavy metal pollution in river sediments from different regions. The stable isotopic compositions of Pb, Zn and Cu were analyzed by MC-ICP-MS, and the sources of heavy metals in the sediments were investigated. The results show that: ① The content of each heavy metal exceeds the environmental background value, and heavy metal pollution in the sediments of Kaifeng urban rivers is in the order of Cd, Zn, Cu, Pb, As, Cr and Ni. The average heavy metal contents in the Huafei river sediments located in the old industrial area are significantly higher than those in the old town and the new development zone. ② According to the speciation distribution, the Cd and Zn bioavailable content in the sediments of Kaifeng urban river are the highest, indicating a high potential risk. The bioavailability of heavy metals in river sediment of old industrial area is higher than that of old urban area and new development area. ③The results of the potential ecological risk assessment show that heavy metal pollution of sediment in Huafei river located in the old industrial area presents a strong ecological risk level of V,while those of the Huangbian River in the old city and the Majia River in the new development area both present a strong ecological risk level. ④ Based on the isotopic compositions of Pb, Zn and Cu, heavy metals in the old industrial area are mainly from industrial activities; Heavy metals of Huangbian River in the old city and Majia River in the development zone mainly come from the discharge of domestic sewage and urban surface runoff.

• Key words：urban river  heavy metal  chemical forms  Pb-Zn-Cu isotope composition  spatial distribution

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