盐城新洋港河表层沉积物重金属污染评价与源解析

以盐城市新洋港河表层沉积物为研究对象，运用富集系数法和潜在生态风险指数法对6种重金属进行污染评价，结合多变量分析方法和正定矩阵因子分解模型（PMF）进行来源解析。研究结果表明，新洋港河表层沉积物重金属Cr、Ni、Cu、Zn、As、Pb的平均浓度分别为70.63 、27.73、21.60、21.60 、9.01、20.38 mg/kg，其平均浓度顺序为Zn>Cr>Ni>Cu>Pb>As，多数表层沉积物样品中6种重金属数样点处于轻度—中度富集水平，潜在生态风险指数评价结果表明研究区域整体处于轻度生态风险。重金属按照来源大致分为3类：①第1类为Cu、Zn和Pb，主要来自工业废水、城市生活污水和城市交通（贡献率占44.60%）；②第2类为Cr和Ni，主要来自城市制造业（贡献率占34.50%）；③第3类为As，主要来源农业污染和养殖（贡献率占20.90%）。

Pollution assessment and source tracking of heavy metals in surface sediments of Xinyanggang River

The ecological risk of six heavy metals (Cr, Ni, Cu, Zn, As, Pb) in the surface sediments collected from the Xinyanggang River in Yancheng, Jiangsu, East China was evaluated using the enrichment coefficient method and potential ecological risk indexing, combined with multivariate analysis method and positive matrix factorization model (PMF) for source analysis. Results show that: (1) The average concentrations of the heavy metals were Cr (70.63 mg/kg), Ni (27.73 mg/kg), Cu (21.60 mg/kg), Zn (21.60 mg/kg), As (9.01 mg/kg), and Pb (20.38 mg/kg). The average levels of metals are in the order of Zn > Cr > Ni > Cu > Pb > As. Six heavy metals in most of the samples were at the levels of low and moderate enrichment. The potential ecological risk index indicated low ecological risk in the whole study area. The sources of heavy metals were divided into three categories. Cu, Zn, and Pb were derived from industrial wastewater, urban domestic sewage, and urban traffic (44.60%); Cr and Ni mainly came from the emission of urban manufacturing operations (34.50%); and As was mainly from agriculture and breeding pollution (20.90%).