| 摘要: |
| 为探究邯郸市滏阳河流域沉积物重金属的垂向分布规律，解析其污染来源及生态风险，为工业型河流生态修复提供科学依据，本研究以邯郸市滏阳河8个不同点位的沉积物柱状样品为研究对象，首先采用垂向分层切割法对沉积物柱进行1 cm间隔的精细分层，继而运用全谱直读ICP发射光谱仪（ICP-OES）测定，系统分析沉积物中重金属（As、Cr、Cd、Cu、Mn、Pb、Zn）的含量及垂向分布特征。综合运用地累积指数（Igeo）、潜在生态风险指数（RI）与绝对主成分得分多元线性回归模型（APCS-MLR）模型，综合评价污染程度并溯源解析。结果表明：滏阳河底泥沉积物中Cd、Pb、Cr平均含量分别达背景值的26.5、62.5和21.0倍，垂向分布显示S8断面呈现历史工业污染累积特征，深层（＞10 cm）Cr、Pb富集量分别高达19 020 mg/kg和27 834 mg/kg。S8断面7种重金属均处于严重污染，S1、S3、S4和S5断面生态风险等级为强，主要归因于Cd的高毒性贡献。根据APCS-MLR模型，在成分1（主工业源）上的载荷均较高（As:0.937,Cr:0.765,Cd:0.814,Pb:0.885），表明强相关性；在成分2（可能为交通源）上的载荷较高（Cr:0.545,Mn:0.596）。本研究构建的滏阳河沉积物重金属垂向污染图谱，阐明工业遗留与农业输入的耦合机制，为流域污染精准管控提供科学依据。 |
| 关键词: 沉积物 重金属 分布特征 风险评价 来源解析 |
| DOI： |
| 投稿时间：2025-04-10修订日期：2025-05-14 |
| 基金项目:国家重点研发计划（2024YFD1700801） |
|
| Source Apportionment and Ecological Risk Assessment of Heavy Metals in Sediments from Fuyang River, Handan City |
|
liu jia kun1, zhu chang jun1, feng ji wen1, xu gao hua1, han teng da1, wang jia bo1, luo xiang shan2, wang chen2
|
| (1.School of Energy and Environmental Engineering, Hebei University of Engineering, Handan;2.Xinjiang Zhonghao Construction Engineering Co., Ltd.) |
| Abstract: |
| To investigate the vertical distribution patterns, pollution sources, and ecological risks of heavy metals in sediments of the Fuyang River Basin in Handan City, and to provide a scientific basis for ecological restoration of industrialized rivers, sediment core samples from eight sites along the Fuyang River are collected in this study. The sediment cores were vertically sectioned at 1 cm intervals and analyzed using inductively coupled plasma optical emission spectrometry (ICP-OES) to determine the contents and vertical distribution characteristics of heavy metals (As, Cr, Cd, Cu, Mn, Pb, Zn). The geo-accumulation index (Igeo), potential ecological risk index (RI), and absolute principal component score-multiple linear regression (APCS-MLR) model were integrated to assess pollution levels and trace contamination sources.The results revealed that the average contents of Cd, Pb, and Cr in the sediments exceeded the regional soil background values by 26.5, 62.5, and 21.0 times, respectively. Vertical distribution profiles indicated significant historical industrial pollution accumulation patterns at site S8, with Cr and Pb concentrations in deeper layers (>10 cm) reaching 19,020 mg/kg and 27,834 mg/kg, respectively. All seven heavy metals at site S8 were classified as "severely polluted", while sites S1, S3, S4, and S5 exhibited "high ecological risk" levels, primarily attributed to the high toxicity contribution of Cd. The APCS-MLR model demonstrated strong correlations between industrial sources (Component 1) and heavy metals (As: 0.937, Cr: 0.765, Cd: 0.814, Pb: 0.885), while traffic-related sources (Component 2) showed moderate associations with Cr (0.545) and Mn (0.596).The vertical contamination profile of heavy metals in the Fuyang River sediments constructed in this study elucidates the coupling mechanism between legacy industrial pollution and agricultural-derived inputs, providing a scientific foundation for precision control and management of basin-scale pollution. |
| Key words: Ssediments heavy metals distribution characteristics risk assessment ?source apportionment |
