ABSTRACT

With the aim of assess the pollutant load from the Volturno River into the Mediterranean Sea, the amount of some heavy metals (As, Hg, Cd, Cr, Cu, Ni, Pb and Zn) was determined in water dissolved phase (DP), suspended particulate matter (SPM) and sediment samples. Total heavy metal concentrations were in the range 0.20–65.67 μg L⁻¹ (mean value of 12.95 μg L⁻¹) for DP, 1.37–601.77 μg L⁻¹ (mean value of 105.39 μg L⁻¹) for SPM and 14.62–157.33 mg kg⁻¹ (mean value of 55.24 mg kg⁻¹) for sediments. The total heavy metals input are evaluated in about 620.39 kg year⁻¹, suggesting that the river could be an important source of heavy metals in the Tyrrhenian Sea. The ecological risk characterisation was assessed based on the National Water Quality Criteria, by comparison with criterion concentration for chronic and acute toxicity (CCC and CMC), and sediment quality guidelines. Hg and Cd showed higher values than CMC and CCC for most water samples. The Index of Geoaccumulation (I_geo), Contamination Factor, Contamination degree, Pollution Load Index (PLI) and Potential Ecological Risk Index were evaluated. According to I_geo and PLI, the Volturno River was uncontaminated or moderately polluted by heavy metals.

摘要

为了评估从沃尔图诺河进入地中海的污染物负荷，在水溶解相（DP）中测定了一些重金属（As、Hg、Cd、Cr、Cu、Ni、Pb 和 Zn）的含量，悬浮颗粒物 (SPM) 和沉积物样品。DP的总重金属浓度范围为0.20-65.67 μg L ^-1（平均值为12.95 μg L ^-1），SPM为1.37-601.77 μg L ^-1（平均值为105.39 μg L ^-1）和14.62-沉积物为 157.33 mg kg ^-1（平均值为 55.24 mg kg ^-1）。总重金属输入在大约 620.39 公斤年^{-1中进行评估}，表明这条河可能是第勒尼安海重金属的重要来源。根据国家水质标准，通过与慢性和急性毒性（CCC 和 CMC）标准浓度和沉积物质量指南进行比较，评估生态风险特征。对于大多数水样，Hg 和 Cd 的值高于 CMC 和 CCC。评价了地积聚指数（I _geo）、污染因子、污染程度、污染负荷指数（PLI）和潜在生态风险指数。根据I _geo和 PLI，Volturno 河未受重金属污染或中度污染。