Yazar "Ustaoglu, Fikret" seçeneğine göre listele

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    Ecological and health risk assessment and quantitative source apportionment of dissolved metals in ponds used for drinking and irrigation purposes
    (Springer Heidelberg, 2023) Tokatli, Cem; Varol, Memet; Ustaoglu, Fikret
    In this study, dissolved metal levels of 10 different ponds used as irrigation and drinking water sources in the north of Saros Bay (Turkiye) were evaluated using multivariate statistical methods, contamination and ecological risk indices, and absolute principal component score-multiple linear regression (APCS-MLR). The mean levels of metals in the ponds ranged from 0.045 mu g/L (Cd) to 127 mu g/L (Mn). Pond 7 used for drinking water source had the lowest total metal level. Only Mn levels in two ponds (P1 and P2) slightly exceeded the critical value set by EU Drinking Water Directive. However, the levels of all metals in all ponds were lower than the critical values set for irrigation water and aquatic life. According to the heavy metal pollution index (HPI), five ponds showed low metal pollution in terms of drinking water quality, four ponds showed moderate metal pollution, and one pond (P1) showed moderate to heavy pollution. According to the Nemerow pollution index (NPI) values (0.26-1.82), ponds P1 and P2 showed slight metal pollution, while other ponds showed insignificant metal pollution. Contamination degree (CD) values of ponds varied between 0.95 and 3.33, indicating that all ponds showed low pollution. In terms of irrigation water quality, all ponds showed low or insignificant metal pollution according to the HPI, NPI, and CD values. According to the ecological risk index (ERI) values, metals in all ponds posed low ecological risks for both drinking and irrigation purposes. Factor analysis identified two potential sources: mixed sources and natural sources. The APCS-MLR model results revealed that mixed sources and natural sources contributed 78.99% and 21.01% to dissolved metals in the ponds, respectively. Health risk assessment results indicated that both individual and combined metals in the ponds would not cause non-carcinogenic risks to both adults and children. Similarly, it was found that Cr and As would not cause carcinogenic risks to the residents of the region.
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    Ecological Risk Assessment of Metals in Sediments from Three Stagnant Water Bodies in Northern Turkey
    (Springer Heidelberg, 2022) Varol, Memet; Ustaoglu, Fikret; Tokatli, Cem
    Purpose of Review In recent years, anthropogenic activities have caused metal pollution in the sediments of stagnant water bodies, and thus threatening aquatic ecosystems and human health. Therefore, determining the potential ecological risks, contamination degree, and possible sources of metals in sediment of stagnant water bodies is essential for effective management of metal pollution. In this study, we used contamination and risk assessment indices together with multivariate statistics to determine ecological risks and contamination degree of 14 metals in sediments of three important stagnant water bodies (Ladik Lake and Yedikir and Degirmendere dam lakes) in northern Turkey. In addition, the effects of organic matter (OM) and pH on metal accumulation in the sediments were also investigated. Recent Findings The mean contents of Al, V, Mn, Fe, Cu, Zn, and Pb did not differ significantly among the water bodies studied (p > 0.05). The Ladik Lake sediments had significantly lower pH level and higher OM content (p < 0.05). Contamination indices indicated that there was no significant metal contamination in the sediments of all water bodies. Similarly, ecological risk indices indicated that metals posed low ecological risks in the water bodies. According to the sediment quality guidelines, metals would not cause harm to benthic organisms. The accumulation of most metals in the Yedikir Dam Lake was controlled by OM, while the distribution of some metals was affected by both OM and pH in the Degirmendere Dam Lake. According to the factor analysis, all metals in the sediments of the water bodies studied mainly originated from natural sources. The results of this study revealed that sediment contamination indices, ecological risk assessment methods, sediment quality guidelines, and multivariate statistics can be used as effective approaches in determining the environmental and ecological risks and pollution sources of metals in the sediments of stagnant water bodies. Thus, this study can provide important information for the ecological risk assessment and management of metals in the sediments of stagnant water bodies.
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    Metal pollution, eco-health risks and source apportionment in coastal sediments of Samsun, Türkiye: A receiving zone for the Kızılırmak and Yesilırmak rivers
    (Academic Press Inc Elsevier Science, 2025) Varol, Memet; Ustaoglu, Fikret; Tokatli, Cem
    This research examined the levels, sources, ecological risks, and health impacts of metal contamination in the coastal sediments of Samsun province, impacted by the Yes,il & imath;rmak and K & imath;z & imath;l & imath;rmak rivers. Surface sediment samples collected from 18 sites representing various land-use types were analyzed for 13 metals (Ba, Cr, Mn, Ni, Co, Sr, Cu, Fe, Zn, Cd, Pb, As and Hg) using inductively coupled plasma mass spectrometry. Spatial assessment results revealed high Cr and Ni concentrations across all sites, primarily due to natural geological formations, while Cd, Pb, Cu, and Hg showed anthropogenic enrichment, particularly at sites near industrial and agricultural areas. Pollution and ecological risk indices as well as sediment quality guidelines (SQGs) were utilized to determine the contamination levels and ecological hazards associated with the metals. Pollution indices (EF, CF, PLI, NPI and MPI) indicated moderate to high pollution levels, mainly driven by Cr and Ni. Ecological risk indices (Er, RI and NRI) showed that Cd posed a moderate risk in sites influenced by industrial and agricultural activities. SQGs-based indices (mERM-Q, TRI and HQc) revealed that some sites exhibited toxic risk potential due to elevated Ni and Cr contents. Health risk assessments highlighted ingestion as the primary exposure pathway and indicated that children were more vulnerable thand adults. The Absolute Principal Component Score-Multiple Linear Regression model discovered three primary sources for metals: natural weathering (21.56 %), anthropogenic activities (32.35 %), and mixed sources (46.09 %). The findings emphasize the importance of determining local background values and sediment quality standards and reinforce the necessity for integrated management strategies to preserve coastal ecosystem health and public safety.
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    Seasonal dynamics of potentially toxic and essential elements in water of rivers feeding the Çanakkale Strait: a strategic gateway to the Aegean Sea
    (Springer, 2025) Tokatli, Cem; Ustaoglu, Fikret; Varol, Memet
    This study investigated inorganic contamination and associated ecotoxicological, irrigational and health risks in eight fluvial habitats discharging into the & Ccedil;anakkale Strait (& Ccedil;S), analysing twelve potentially toxic (PTEs) and essential (EEs) elements in seasonal surface water samples (2021-2022). Comprehensive water quality (WQI, HPI, NPI, CD, ERI), irrigational suitability (SAR, Na%, MH, KR), and non-carcinogenic/carcinogenic health threats were assessed. Furthermore, multivariate statistical techniques (PCI, PCA, and CA) enabled the identification of probable pollution sources and the classification of potamics. Spatially, Biga Peninsula (BP) streams had higher levels of PTEs, while Gelibolu Peninsula (GP) streams had more EEs. Temporally, dry season concentrations were generally higher. Ecotoxicological and irrigational indices mostly indicated acceptable to moderate contaminated conditions. However, arsenic exposure at Kepez, Hamaml & imath;k and K & uuml;& ccedil;& uuml;k Menderes streams poses both non-carcinogenic and carcinogenic health risks, with CR values far exceeding the safety threshold. PCA identified three distinct pollution sources-geological, industrial, and agricultural-explaining over 81% of the total variance in water quality parameters. CA categorized the region into high, moderate, and low contamination zones, underscoring spatial heterogeneity in water quality.