Fatemeh Einolahi; Alireza Safahieh; Ali Ali Dadollahi sohrab; Ahmad Savari
Volume 10, Issue 2 , September 2012, , Pages 10-25
Abstract
In order to understand the extent of heavy metals contamination in sediments and rock oyster Saccostrea cucullata, of Chabahar intertidal zone, samples of sediment and oyster were collected from 5 different stations namely Guatr, Beris, Ramin, Shahid Beheshti and Tiss during low tide. Sediment and tissue ...
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In order to understand the extent of heavy metals contamination in sediments and rock oyster Saccostrea cucullata, of Chabahar intertidal zone, samples of sediment and oyster were collected from 5 different stations namely Guatr, Beris, Ramin, Shahid Beheshti and Tiss during low tide. Sediment and tissue samples were acid digested and heavy metals content of the samples were analyzed. Results showed that Cu, Pb and Ni concentration in the sediment samples was 15.87-16.96, 10.98-15.79 and 12.39-17.10 µg/g, respectively. Heavy metals concentration in soft tissues of oyster was 84.96-289.93, 3.83-5.26 and 6.05-7.19 µg/g for Cu, Pb and Ni ,respectively. Similarly, Cu, Pb and Ni concentration in shell ranged between 13.83-6.67, 11.32-14.93 and 5.97-7.97 µg/g, respectively. No significant difference was found between Cu and Ni concentrations in sediment samples. It is suggested that metals accumulation in different oyster tissues was related to their essentiality for oyster. Heavy metals concentration in oyster and sediment was found to fall within the range of some available standards, indicating that metals contamination does not seems to be problematic in the area.
Ali Azimi; Alireza Safahieh; Ali Dadollahi Sohrab2; Hossein Zolgharnein1; Ahmad Savari
Volume 10, Issue 3 , September 2012, , Pages 23-32
Abstract
Heavy metals are major group of dangerous contaminants in marine environment. Due to their persistence, they may enter aquatic food chains and transfer from one trophic level to another. They also may be harmful for human being which is placed at the top of the food chain. Imam Khomeini’s Port ...
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Heavy metals are major group of dangerous contaminants in marine environment. Due to their persistence, they may enter aquatic food chains and transfer from one trophic level to another. They also may be harmful for human being which is placed at the top of the food chain. Imam Khomeini’s Port is located in the north west end of Persian Gulf and ships traffic and several industries especially petrochemical industries around of the port, discharge various organic and non-organic contaminants such as heavy metals into this ecosystem. In this study in order to investigate the levels of heavy metals (Hg, Cd, Pb and Cu) in soft tissue of oyster Crassostrea gigas from Imam Khomeini port, oysters of the same size were sampled on March 2010 from 5 different locations including harbors of Petroshimi, Doc Sorsoreh, 15, 28 and 33 in the Imam Khomeini port. The samples were freeze dried and acid digested in order to determine their heavy metal content with atomic absorption spectrophotometry. Results indicated that the content of Hg, Cd, Pb and Cu in the oysters’ soft tissue were 3.12±2.97, 7.56±3.62, 7.1±3.30 and 440.57±66.17 µg/g of dry weight, respectively. The highest level of Hg, Pb and Cu were recorded in harbor of Petroshimi while the highest level of Cd was measured in harbor no 15.The concentration of Hg, Cd, Cu and Pb in bivalve soft tissue was more than standard limits. This can be dangerous for public health therefore regular monitoring of heavy metals in the area is recommended.
Mostafa Alahverdi; Ali Dadolahi-Sohrab; Alireza Safahiyeh; Ahmad Savari
Volume 10, Issue 4 , September 2012, , Pages 55-66
Abstract
In this research, bioaccumulation ability of seaweed species Ulva intestinalis and Sargassum angustifolium to heavy metals (Ni, Cd, Cu and Pb) and possible use of their chlorophylls content as biomarker of metals stress was studied. Samples of seaweeds and sediment were collected from four stations along ...
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In this research, bioaccumulation ability of seaweed species Ulva intestinalis and Sargassum angustifolium to heavy metals (Ni, Cd, Cu and Pb) and possible use of their chlorophylls content as biomarker of metals stress was studied. Samples of seaweeds and sediment were collected from four stations along the province of Bushehr coastal areas during January 2008 and June 2009. Chlorophylls of seaweeds were extracted using aceton (90%) and content of chlorophylls were determined spectrophotometrically. Metals in sediment and seaweeds were extracted using hot concentrated nitric acid (65%) and analysed by atomic absorption spectrophotometery. The mean concentrations of Ni, Cd, Cu, Pb in sediment were 32.17, 6.38, 6.90, 45.96 µg. g-1 dry weight, in U. intestinalis 29.28, 4.08, 6.78, 32.08 µg. g-1 dry weight, and in S. angustifolium 15.00, 3.78, 5.13 and 18.30 µg. g-1 dry weight, respectively. Pearson correlation coefficients between metals in sediment and seaweeds showed significant correlation between Pb in sediment and U. intestinals and Cd and Pb in sediment and S. angustifolium. The results revealed, variations of Chlorophylls content in S. angustifolium has been shown to be a better indicator of environmental stress compare to U. intestinalis