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Temporal and spatial ofheavy metals concentrations (Zn, Cu, Ni, Pb, Cd and Hg) in Iraniancoastalwaters of the Southern Caspian Sea
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Hassan Nasrollahzadeh Saravi   , Shaban Najafpour , Maryam Rezaei , Abdolah Solaimaniroudi |
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Abstract: (5396 Views) |
| This study was conducted to determine six heavy metals (Zn, Cu, Ni, Pb, Cd and Hg) concentrations in water (during four seasons) at eight transects (Astara, Anzali, Sefidroud, Tonekabon, Nowshahr, Babolsar, Amirabad and Turkman) in the southern coasts of the Caspian Sea in 2010-2011. 93 samples of water were collected at 10, 50 and 100 meters depths. All samples were prepared by extracting processes and then determined using Atomic Absorption Spectroscopy (AAS) instrument. Results of current study showed that maximum values of Zn, Ni, Pb and Hg were observed inspring and for Cd was inwinter. Also, at the west and center regions were more contaminatedthanthe east part. Annual mean contents and standard error (±SE) of water were registered 2.10 ±0.59, 1.64 ±0.18, 0.68 ±0.10, 0.11 ±0.01 mg/l and 3.30 ±0.40 µg/l for Ni, Pb, Cd, Zn and Hg, respectively. The mean values of the examined heavy metals with percentage (in parenthesis) in water samples during four seasons were obtained in this order Ni(46.3%)>Pb(39.1%)>Cu(15.0%)>Zn (2.5%)>Hg(1.0%). In conclusion, the results revealed that in the most transects the heavy metal concentrations of water were above the threshold levels associated with the toxicological effects and the regulatory limits (ANZECC, MPL and UKMPA) which represented polluted condition in this area. In addition, correlation between environmental parameters and heavy metals showed that the addition of different resources of metals,different behavior of bio-geochemical behavior was influenced on their concentrations. |
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| Keywords: Heavy metals pollutions, Water, Caspian Sea, Iran |
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Full-Text [PDF 95 kb]
(2664 Downloads)
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Type of Study: Research |
Subject:
Fisheries
Received: 2015/02/18 | Accepted: 2015/02/18 | Published: 2015/02/18
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