Heavy metal concentrations in surface sediments from two regions (Saros and Gokova Gulfs) of the Eastern Aegean Sea

The main goal of this study is to determine the present heavy metal pollution state in the two gulfs of the Aegean Sea; Saros and Gokova Gulfs. The surface sediments were collected from 11 and eight locations in the Saros and Gokova during May 2001, respectively. The results showed that the sediments of Saros and Gokova gulfs were polluted with Pb, Cr, Zn, Mn, and Ni and Pb, Cr, Ni, and Mn, respectively. For various metals the contamination factor (CF) has been calculated to assess the degree of pollution in sediments. The sediments were noted to be not contaminated with Hg, Cd, and Cu in all areas. Moderate contaminations were observed for Pb, Cr, and Zn in Saros Gulf. The CF was moderate and very high for Ni in the Saros and the Gokova Gulf, respectively

Assessment of trace metal pollution in surface sediments of Nemrut Bay, Aegean Sea

Surface sediments collected from nine stations in Nemrut Bay, Aegean Sea were analyzed for trace metals (Hg, Cd, Pb, Cr, Cu, Zn, Mn, Ni, Fe, As, and Mg) and grain sizes. The results were compared with the numerical sediment guidelines used in North America as well as literature values reported for similar studies conducted in Izmit Bay and Izmir Bay. The metal levels were also evaluated according to the enrichment factor and contamination factor analyses. The analyses revealed significant anthropogenic pollution of Hg, Pb, Zn, and As in the surficial sediments of Nemrut Bay

Heavy metal contaminants in Red Pandora (Pagellus erythrinus) tissues from the Eastern Aegean Sea, Turkey

Heavy metal contents were investigated in different organ tissues of Red Pandora (Pagellus erythrinus) from the eastern Aegean Sea between May 1996 and July 1998. The concentrations of mercury in the muscle tissue ranged between 16 and 716, in liver 125-5451, in gonad 2.0-1858; cadmium in muscle nd-9.6, in liver 1.4-2245, in gonad nd-192; lead in muscle nd-1397, in liver 112-8311, in gonad nd-2927; zinc in muscle 1352-6693, in liver 2710-78705, in gonad 7273-168655; copper in muscle nd-383, in liver nd-21986, in gonad nd-20499 (mu g/kg wet weight). The highest concentrations were generally found in the Southern Aegean Sea. All metal levels in muscle tissues are lower than the limits of European Dietary Standards and Guidelines. The metals ratios between liver and muscle indicated that the liver accumulated higher levels of metals than the muscle tissues. The bioaccumulation factor (BAFs) of metals was measured in muscle, liver and gonads. BAFs among the analysed elements showed the descending orders as Zn > Cu > Cd > Pb for muscle and gonads and Cd > Zn > Cu > Pb for liver. (c) 2006 Elsevier Ltd. All rights reserved

Assessment of trace metal concentrations and human health risk in clam (Tapes decussatus) and mussel (Mytilus galloprovincialis) from the Homa Lagoon (Eastern Aegean Sea)

Seasonal variations of tracemetal concentrations (Hg, Cd, Pb, Cr, Zn, and Cu) were investigated in the hepatopancreas and soft tissues (remaining parts of bivalves such as gill, mantle, foot, and muscle) of Tapes decussatus and Mytilus galloprovincialis from theHomaLagoon. The highest metal concentrations were recorded frequently in February and July in M. galloprovincialis and T. decussatus, respectively. Tracemetal levels (exceptZn) in the hepatopancreaswere higher than those in soft tissue for both bivalves. The results showed that the mean concentrations of Hg, Cd, and Zn for M. galloprovincialis were higher compared to T. decussatus in both tissues. The metal concentrations in both bivalves from the Homa Lagoon were generally below the values of provisional tolerable weekly intake (PTWI) estimates, in terms of human health risk. According to hazardquotient(HQ), Crvalues forbothspeciesandCdvalues for only M. galloprovincialis were found greater than one. Also, total hazard index (THI) values were greater than one in both bivalves, having a potential risk for consumers

Sediment concentrations of heavy metals in the Homa Lagoon (Eastern Aegean Sea): Assessment of contamination and ecological risks

The concentrations of heavy metals and organic carbon in sediment of the Homa Lagoon which is one of the most productive lagoons and commercial important active fish trap in the Eastern Aegean Sea, were investigated in order to describe the temporal and spatial distributions of metals. These results were used to evaluate possible ecological risks that could be a problem for the environment of the lagoon in the future. Sediments were enriched with Cr, Ni and considered as heavily polluted per the SQG. The C-f of Ni and Cr were presented moderate level of contamination in this area. The C-d levels indicated moderate degree of contamination at station B, C, D and E due to agricultural drainage water, industrial and domestic wastewater, are transported by the Gediz River. Sediments from Noma Lagoon were most toxic for Ni due to exceedances of the TEL and PEL values. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved

Evaluations of heavy metal pollution in sediment and Mullus barbatus from the Izmir Bay (Eastern Aegean) during 1997-2009

Izmir Bay is one of the great natural bays of the Mediterranean. The surface sediment and fish samples were collected during 1997-2009. The sediment concentrations of inner bay showed significant enrichments during sampling periods. Outer and middle bays exhibited low levels of metal enrichments except the estuary of Gediz River. The concentrations were generally higher than the background levels from the Mediterranean and Aegean except Cd and Pb levels gradually decreased. Metal EF is used as an index to evaluate anthropogenic influences of metals in sediments. Maximum metal enrichment was found for Hg in the outer bay, while Pb indicated maximum enrichment in the middle-inner bays. Metal levels were evaluated in sediments in accordance with the numerical SQG of the USEPA. The levels of fish tissues were lower than the results reported from polluted areas of the Mediterranean. The highest BAFs were detected for Hg and Cd in fish. (C) 2011 Elsevier Ltd. All rights reserved

CONCENTRATION OF HEAVY METALS AND INVESTIGATION OF BACTERIAL TOXIC METAL RESISTANCE IN COASTAL CITY SEDIMENTS (EASTERN AEGEAN SEA)

WOS: 000373523600013Izmir is located on the Eastern Coast of the Aegean Sea in Turkey. In present study, it was aimed to determine the toxic metal resistance of bacterial isolates from coastal city sediments. Twenty-six isolates (Bacillus, Marinibacillus, Halobacillus) were identified and these strains were investigated in respect of the minimum inhibitory concentrations of metals, susceptibility of some antibiotics (Ampicillin, Tetracycline, Chloramphenicol, Tobramycin). The MICs of metals were different for each strain but the general order of resistance to the metals was found to be as Ni>Pb>Cu>Cr>Cd>Hg and the toxic effects of these metals increased with increasing concentration. Bacterial isolates were highly resistant to Ni (13 mM), Pb (6 mM). Additionally, it was found that the strains were resistant to Ampicillin. The highest concentrations of metals were found in the sediments of the inner part of the Bay, which is intensely industrialized compared to the middle and outer parts of the Bay. This study and several other studies suggest that sediment bacteria in an area polluted with heavy metal can be biological indicators.Scientific Research Projects Coordination Unit of Dokuz Eylul UniversityDokuz Eylul University [2012.KB.FEN.022]Financial support by Scientific Research Projects Coordination Unit of Dokuz Eylul University (Project number: 2012.KB.FEN.022) for this work is gratefully appreciated

Distribution of heavy metals in water, particulate matter and sediments of Gediz River (Eastern Aegean)

The present paper is the first document of heavy metal levels in surficial sediment, water and particulate matter of the Gediz River collected from five different sites in August, October 1998, February, June 1999. The present work attempts to establish the status of distribution and environmental implications of metals in the sediment, water and particulate matter and their possible sources of derivation. The concentrations of mercury ranged 0.037-0.81, 120-430; lead 0.59-1.5, 190-8,100; copper 0.24-1.6, 30-180; zinc 0.19-2.9, 10-80; manganese 30-170, 20-490; nickel 0.39-9.0, 100-510; iron 1.3-687, 100-6,200 mu g/l in water and particulate matter, respectively. The maximum values in water were generally obtained in summer periods due to industrial and agricultural activities at Muradiye. The particulate metal concentrations also generally showed increased levels from the upper Gediz to the mouth of the river. Calculation of metal partition coefficients shows that the relative importance of the particulate and the water phases varies in response to water hydrochemistry and suspended solid content, but that most elements achieve a conditional equilibrium in the Gediz River. The metals ranged between Hg: 0.25-0.49, Cr: 59-814, Pb: 38-198, Cu: 15-148, Zn: 34-196, Mn: 235-1,371, Ni: 35-175, and Fe: 10,629-72,387 mg/kg in sediment. The significant increase of metals found in Muradiye suggested a pollution effect, related to anthropogenic wastes. Also, relatively high concentrations of Ni and Mn occurred in sampling site upstream, due to geochemical composition of the sediments. Maximum values of contamination factor for metals were noticed for sediment of Muradiye. The sampling stations have very high degree of contamination indicating serious anthropogenic pollution

CONCENTRATION OF HEAVY METALS AND INVESTIGATION OF BACTERIAL TOXIC METAL RESISTANCE IN COSTAL CITY SEDIMENTS (EASTERN AEGEAN SEA)

WOS: 000371447700006Izmir is located on the Eastern Coast of the Aegean Sea in Turkey. In this study, it was aimed to determine the toxic metal resistance of bacterial isolates from coastal city sediments. Twenty-six isolates (Bacillus, Marinibacillus, Halobacillus) were identified and these strains were investigated in respect of the minimum inhibitory concentrations of metals, susceptibility of some antibiotics (Ampicillin, Tetracycline, Chloramphenicol, Tobramycin). The MICs of metals were different for each strain but the general order of resistance to the metals was found to be as Ni>Pb>Cu>Cr>Cd>Hg and the toxic effects of these metals increased with increasing concentration. Bacterial isolates were highly resistant to Ni (13 mM), Pb (6 mM). Additionally, it was found that the strains were resistant to Ampicillin. The highest concentrations of metals were found in the sediments of the inner part of the Bay, which is intensely industrialized compared to the middle and outer parts of the Bay. This study and several other studies suggest that sediment bacteria in an area polluted with heavy metal can be biological indicators.Scientific Research Projects Coordination Unit of Dokuz Eylul UniversityDokuz Eylul University [2012.KB.FEN.022]Financial support by Scientific Research Projects Coordination Unit of Dokuz Eylul University (Project number: 2012.KB.FEN.022) for this work is gratefully appreciated