The pollution of water sources by factories that discharge heavy metals into the environment is among the most dangerous threats to human health and the environment. This study investigated the concentration of heavy metals (Pb, Cd, Fe, Cu, Cr, and Zn) in the Aharchai River as the most important river in northwestern Iran. This study had a descriptive cross-sectional design, and sampling was done at six hydrometric (gauging) stations along the river during the rainy (spring) and dry (summer) seasons in 2018. The concentrations of heavy metals were measured by an atomic absorption device. The results showed significant differences in the concentrations of heavy metals at various stations in the two seasons of spring and summer. As for the concentrations of Pb and Cd, all stations stood higher than the standards introduced by the World Health Organization (WHO) for drinking water. The results of potential risk assessment revealed that risk quotient (RQ) for Cd and Pb were 2.1 and o.61, respectively, indicating a small potential for adverse effects related to the Cd element in the Aharchai River. Therefore, it can be concluded that the Aharchai River is in unfavorable condition regarding aquatic life, especially in the downstream area and in some routes in terms of agricultural purposes.

将重金属排放到环境中的工厂对水源的污染是对人类健康和环境的最危险威胁之一。这项研究调查了作为伊朗西北部最重要河流的阿哈奇河中重金属（铅，镉，铁，铜，铬和锌）的浓度。这项研究采用了描述性的横断面设计，并在2018年的雨季（春季）和旱季（夏季）在沿河的六个水文测量站进行了采样。通过原子吸收法测量了重金属的浓度。设备。结果表明，在春季和夏季的两个季节中，各个站点的重金属浓度存在显着差异。至于铅和镉的浓度，所有站点的水位均高于世界卫生组织（WHO）提出的饮用水标准。潜在风险评估的结果显示，镉和铅的风险商（RQ）分别为2.1和o.61，表明与阿卡奇河中Cd元素相关的不利影响的可能性很小。因此，可以得出结论，阿哈奇河在水生生物方面处于不利条件，特别是在下游地区和某些路线的农业用途方面。