Total Organic Carbon (Toc) Of The Surface Layer Sediments Covering The Seafloor Of The Romanian Black Sea Coast

Lazăr, Luminița; Gomoiu, Marian Traian; Boicenco, Laura; Vasiliu, Dan

doi:10.5281/zenodo.56875

Cited by 8 publications

(3 citation statements)

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“…As a part of chemical parameters, TN and TP concentrations were measured during the dry and wet seasons; however, the concentration of these nutrients was increased remarkably during the wet season, as the activity of microorganisms is mostly in the hot season rather than in the dry season (WHO 2004;Al-Ani et al 2019). TOC and OM are considered pollution indicators; the existence of OM in soil or water sediments leads to the interaction with metal ions, which in turn results in the formation of soluble and insoluble complexes to produce particles and, therefore, contamination of surface water (WHO 2004;Lazar et al 2012). The result of Al-Ani et al (2019) also reported that high values of TOC were in the dry season and high values of OM were in the wet season.…”

Section: Discussionmentioning

confidence: 99%

Anthropocentric perspective on climate variability: the destination of antibiotics in the Tigris river is not restricted

Al-Haideri,

Hassan,

Sattar

et al. 2024

Journal of Water and Health

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This study aimed to detect antibiotics in water, particulate, plant, and sediment in the Tigris River within Baghdad City, in addition to their spatiotemporal variations, and related physicochemical parameters. Five sites were selected in the river. Three target antibiotics (tetracycline, gentamycin, and ciprofloxacin) were detected in water, particulate, plant, and sediment of the river at all selected sites. The results clearly showed that the concentrations of target antibiotics were sediment > water > plant > particulate. Site 3 is considered as a risk site where high concentrations of all antibiotics during the wet and dry seasons were recorded. Tetracycline was recorded as a high concentration among other antibiotics in the river. Spearman's correlation and principal component analysis showed only a weak correlation between dissolved oxygen and the electric conductivity of the river's sediment with target antibiotics. To our knowledge, this was the first study of antibiotic traces in the Tigris River ecosystem. Lack of wastewater management, absence of antibiotic treatment, and less public awareness of antibiotic consumption are the main causes of antibiotic risk in the river ecosystem.

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Section: Discussionmentioning

confidence: 99%

Anthropocentric perspective on climate variability: the destination of antibiotics in the Tigris river is not restricted

Al-Haideri,

Hassan,

Sattar

et al. 2024

Journal of Water and Health

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“…(3) The TOC content in sediments can differ temporally (seasonally) and spatially (e.g., algae blooms, suspended matter transported by rivers, or soot) (Lazǎr et al, 2012;Lu et al, 2020;Pusceddu et al, 1999). This might have an influence on the comparability of contaminant concentrations in sediments when TOC normalization is applied, raising questions for TOC-independent normalization methods.…”

Section: Applicability Of the Wet-sieving Methodsmentioning

confidence: 99%

“…Second, the correlation between contaminants and TOC may be weak or even absent, and third, the reference values (e.g., OSPAR 2.5% TOC) may not be applicable for all areas (ICES, 2009). Furthermore, the composition of TOC can differ between samples temporally (seasonality) and spatially, as TOC can arise from various sources (e.g., algal blooms, suspended matter transported by rivers, or soot) and, therefore, its affinity for contaminants can also vary (ICES, 2009;Lazǎr et al, 2012;Lu et al, 2020;Pusceddu et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Distribution of hydrophobic organic contaminants in marine sediment fines—An alternative normalization strategy?

Logemann

Röhrs

Brockmeyer

2023

Integr Envir Assess & Manag

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The necessary normalization of contaminant concentrations, in order to be able to compare contaminant content in sediments with different sediment properties, is currently not standardized within environmental monitoring and assessment programs. Therefore, this study investigates an alternative normalization strategy for hydrophobic organic contaminants (HOCs) by removing the coarse and chemically inert sediment fraction using an improved, half‐automated wet‐sieving method. We compare the results to commonly used TOC normalization (2.5% total organic carbon [TOC], OSPAR). Simultaneously, the study provides a comprehensive overview of HOC concentrations in sediment fines (<63 µm) for the German Exclusive Economic Zone and therefore gathers information about the more bioavailable and mobile part of the sediment that particularly accumulates HOCs due to its high surface area. We analyzed bulk sediment samples and their corresponding fine grain fractions from 25 stations in the German Exclusive Economic Zone for 41 HOCs including polycyclic aromatic hydrocarbons, polychlorinated biphenyls, and organochlorine pesticides. The results indicate that the wet‐sieving procedure is capable of physically normalizing the concentrations of the investigated HOCs and is useful for the comparison of concentrations in different sediment types. The wet‐sieving procedure is more time consuming than the normalization to the TOC content. However, it offers the possibility of lowering the detection limits (LODs) through the analytical sample preparation procedure used, as sieving concentrates the contaminants. Therefore, a higher number of results >LOD were detected in sediment fines, leading to more informative data sets. In contrast to the commonly used normalization to 2.5% TOC, the statistical analyses carried out (principal component analysis with subsequent cluster analysis) additionally indicate that physical normalization allows better differentiation of sampling sites by contaminant sources and geographic location rather than their sediment characteristics. Integr Environ Assess Manag 2023;00:1–13. © 2023 The Authors. Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC).

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The impacts of seawater physicochemical parameters and sediment metal contents on trace metal concentrations in mussels—a chemometric approach

Perošević

Pezo

Joksimović

et al. 2018

Environ Sci Pollut Res

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The concentrations of Al, Ba, Cd, Co, Cr, Cu, Fe, Li, Mn, Ni, Pb, Sr, Zn, and Hg were studied in Mytilus galloprovincialis collected from the coastal area of Montenegro. The impact of seawater temperature, salinity, dissolved oxygen, total organic carbon (TOC), and metal content in sediment samples on the metal contents in mussels collected from three locations in four different seasons was analyzed by a Pearson correlation coefficient (r), principal component analysis (PCA), and cluster analysis (CA). These analyses were used to discriminate groups of samples, elements, and seawater parameters, according to similarity of samples chemical composition in different seasons, as well as the impact of seawater parameters and surface sediment composition on the mussels' element concentrations. Synergistic interactions occurred between seawater TOC, Fe, and Al concentrations in mussels. Compared with other studies, which are usually performed under constant laboratory conditions where mussels undergo only one stress at a time, this study was performed in nature. The analyses showed the importance of considering simultaneously acting environmental parameters that make determining of separate impacts of each factor selected very difficult and complex.

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Total Organic Carbon (Toc) Of The Surface Layer Sediments Covering The Seafloor Of The Romanian Black Sea Coast

Cited by 8 publications

References 1 publication

Anthropocentric perspective on climate variability: the destination of antibiotics in the Tigris river is not restricted

Anthropocentric perspective on climate variability: the destination of antibiotics in the Tigris river is not restricted

Distribution of hydrophobic organic contaminants in marine sediment fines—An alternative normalization strategy?

The impacts of seawater physicochemical parameters and sediment metal contents on trace metal concentrations in mussels—a chemometric approach

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