Environmental Geochemistry of Zarjoob River in Rasht City (Guilan Province)
Subject Areas :Zahra Bahari Chahardah 1 , Shahroz Haghnazar 2
1 - دانش آموخته کارشناس ارشد زمین شناسی زیست محیطی دانشگاه آزاد اسلامی واحد لاهیجان
2 - استادیار گروه زمین شناسی دانشکده علوم، دانشگاه آزاد اسلامی واحد لاهیجان
Keywords: Contamination, Environmental, Zarjoob River, geochemically,
Abstract :
Zarjoob River is located in north of Iran, Guilan province, Rasht city limits. During the study, the water and sediments of Zarjoob River were sampled in 5 places. According to geochemical studies on sediment and water of Zarjoob River it was found that there is no environmental contamination in river's sediment but the analysis of river's water shows that the existence of elements of Cadmium, Cobalt, Mercury, Manganese, Nickel and Zinc in all samples of water specially in Rasht industrial city region and Golsar Bridge to Pirbazar are more than WHO standard and water standard of Iran. These elements' concentration changes process is affected by the arrival of urban- domestic and industrial wastewater. The concentration of these elements along the river (before, inside, and after Rasht city) has irregular changes. The amount of BOD of river's water in all stations except in one of them is more than the standard in Iran and it is due to the arrival of industrial, domestic and hospital wastewater along the river. The amount of COD in all stations is more than the water standard of Iran which is approximately 30 times more than the standards in Golsar region to Pirbazar and this indicates very severe water contamination in river. Heavy metals existed in international water enter the body of fish and other aquatic animals and they are accumulated in their body. Also the accumulation of heavy metals in plants' tissue finally enters food chain which could be the reason of developing gastrointestinal cancer and endocrine diseases in Guilan province.
_||_
