عنوان مقاله [English]
In recent years, considering the incremental growth of population, agricultural and industrial activities, pollution of water has surged significantly. Most of the industries overlook environmental concerns, probably due to economic and cultural problems, leave their poisonous and chemical effluents in the surface water which pollutes both the water itself, and the river sediments, causing numerous problems for the environment. In this study, the concentration of four heavy metals of arsenic (As), chromium (Cr), cadmium (Cd), and lead (Pb) have mean investigated in the water and sediments of Haraz River, Mazandaran. The results showed that the concentration of arsenic (AS), chromium (Cr), cadmium (Cd), and lead (Pb) in water are 3.03- 3.99, 2.55-3.92, 1.94-2.42, and 3.96-5.3 mg/lit, and in sediment are 2.12-5.15, 29.91-32.71, 1.22-1.30, and 6.62-9.46 mg/kg, respectively. The concentration of heavy metals in S7 and S8 sites were higher than normal drinking water, due to the disposal of waste, untreated effluents from various industries and excessive agricultural activities. Pollution load index (PLI) of the heavy metals is considered a low/average pollution for sediment samples and the pollution either did not exist or was a minor one in terms of Geoaccumulation Index (Igeo). This study suggests that a continued monitoring of heavy metals in water, sediments and other aquatic biomasses is crucial in Haraz River to ensure the environmental safety adjacent to the river.