The present study assesses the level of heavy metals concerning sediment from the Koudiet Medouar dam. This dam is intended for the production of drinking water and irrigation. In order to assess the level of contamination of the dam by toxic metals, 216 sediment samples were taken at nine stations upstream and downstream of the dam from 2012 to 2014. At the same time, the physical characteristics of the water and the physicochemical parameters of the sediments were determined. The results, expressed by the mean ± standard deviation, are for water: temperature, 15.5 ± 7 °C; potential of hydrogen, 8.05 ± 0.36; conductivity, 1125 ± 228 μS/cm. For sediments the values are potential of hydrogen, 8.55 ± 0.22; conductivity, 730 ± 347 μS/cm; carbonates, 49.18 ± 18.1%; fraction less than 63 μm 27.06 ± 6.95%; organic matter 3.02 ± 1.2%. Trace metal concentrations followed the order: Mn > Zn > Cr > Cu > Co > Ni > Pb > Cd. The strong correlation among trace metal indicates that these elements have common sources suggesting their association with silted sands. The geo-accumulation index, contamination factors, degree of contamination, and sediment pollution index reveal a polymetallic contamination dominated by two or more elements in which Cd, Cr, and Cu are of greatest concern. The levels of trace metals in the sediments record high concentrations upstream of the dam, especially in the second station of the village, near the dam. Our results reflect the footprint of anthropogenic inputs of cadmium, chromium, and copper resulting from agricultural activities by runoff water and soil erosion as well as domestic water discharges.

本研究评估了 Koudiet Medouar 大坝沉积物的重金属含量。该大坝用于生产饮用水和灌溉。为了评估大坝受有毒金属的污染程度，从 2012 年到 2014 年，在大坝上游和下游的 9 个站点采集了 216 份沉积物样本。同时，测定了水的物理特性和沉积物的物理化学参数。结果由平均值±标准差表示，适用于水：温度，15.5 ± 7 °C;氢电位，8.05 ± 0.36;电导率，1125 ± 228 μS/cm。对于沉积物，值为氢的电位 8.55 ± 0.22;电导率，730 ± 347 μS/cm;碳酸盐，49.18 ± 18.1%;分数小于 63 μm 27.06 ± 6.95%;有机质 3.02 ± 1.2%。痕量金属浓度遵循以下顺序：锰 > 锌 > 铬 > 铜 > 钴 > 镍 > 铅 > 镉。痕量金属之间的强相关性表明这些元素具有共同的来源，表明它们与淤砂有关。地质累积指数、污染因子、污染程度和沉积物污染指数揭示了以两种或多种元素为主的多金属污染，其中 Cd、Cr 和 Cu 是最受关注的元素。沉积物中的微量金属含量在大坝上游记录了高浓度，尤其是在大坝附近的村庄第二站。我们的结果反映了径流水和土壤侵蚀以及生活用水排放造成的农业活动对镉、铬和铜的人为输入的足迹。