Investigation of Pb, Zn and Ni in Watershed of Anzali Wetland (case study: Goharrood River)

Subject Areas : environmental management

Aryamen Ghavidel ¹ ( Environmental Research Institute of Jahad Daneshgahi, Member of the Science Board )
Faramarz Moattar ² ( PhD. Atomic Chemistry, Iranian Atomic Energy Organization )

Received: 2009-12-01 Accepted : 2010-04-14 Published : 2014-05-22

Keywords: Heavy Metals, Water pollution, Anzali Wetland, Goharrood river,

Abstract :

Heavy metals are the most important pollutant factors of water resources specially rivers. Entrance ofmetals in natural aquatic ecosystems arises from discharging of domestic, agricultural and industrialsewage. With respect to the health risks possibility and also importance of aquatic ecosystems, in thisstudy the amounts of Pb, Zn, Ni elements in Goharrood river of Rasht were measured. The sampleswere collected in nine stages from five stations. Experiments were done by atomic absorptioninstruments. Results showed that the average amounts of Pb, Zn and Ni all along the river wererespectively 3830, 156 119,31 15 ppb. Maximum amounts were measured as follows: Pb 168 ppbin station 3, Zn 513 ppb in station 4 and Ni 60 ppm in station4.ANOVA doesn't show significant difference between the measured average amounts of Pb, but thereis significant difference between the average amounts of Zn and Ni elements in different stations. Thispaper shows that the stations inside the city measured a larger amount of the elements. This can be aresult of discharging large amounts of domestic and industrial waste water to this part of the river.Rates of the elements in Goharrood river were found to be over the maximum acceptable ratesdetermined by the department of environment for keeping aquatic organisms alive since Goharroodriver is one of the routes for water to enter Anzali wetland, there is a possibility of increased biologicalrisks in fish and human bodies.

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