Silt/clay fractionation in surficial Marmara sediments: implication for water movement and sediment transport paths in a semi-enclosed and two-layered flow system (northeastern Mediterranean Sea)

“…These fine grain size areas correspond to regions where tidal currents converge. Ergin and Bodur (1999) indicated the role that hydrodynamic power plays in the transport of sedimentary materials. They noted that fine sediments (silt and clay) typically accumulate in areas with low hydrodynamic energy, whereas sandy sediments typically accumulate in high-hydrodynamic environments.…”

Section: Resultsmentioning

confidence: 99%

Strong Acid Mixture and Sequential Geochemical Arsenic Extractions in Surface Sediments from the Santa Maria La Reforma Coastal Lagoon, Mexico: A Bioavailability Assessment

Rivera-Hernández

Green-Ruíz

2016

Arch Environ Contam Toxicol

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Thirty-three sediment samples were collected from the Santa Maria La Reforma coastal lagoon and digested by way of a strong acid mixture and sequential arsenic (As)-extraction method to determine the arsenic (As) content and bioavailability. The As content was determined by atomic fluorescence spectrometry. In addition, grain-size analyses were performed, and organic carbon, carbonate, and iron (Fe) and manganese (Mn) concentrations were determined. Fe and Mn determination was performed by atomic absorption spectroscopy. A Pearson correlation matrix and As enrichment factors were calculated. Sediment concentrations from Santa Maria La Reforma ranged from 3.6 to 25 µg As g(-1) with an average of 13.4 ± 7.6 µg As g(-1). The highest values were observed in the northern (Playa Colorada), north-central (Mocorito River discharge zone), and southern zones ("El Tule" agricultural drain). Most samples were classified as exhibiting no or minor As enrichment and were lower than the threshold effect level (TEL; 7.24 µg g(-1)) for biota (MacDonald et al. in Ecotoxicology 5:253-278, 1996). Low bioavailable As values (<3 %) were measured in the majority of the sediment. The highest As percentages were associated with the oxyhydroxide fraction (F5). The results indicate that As bioavailability is negligible.

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“…However, minerals like montmorillonite, bentonite, and kaolinite are found in substantial quantity in clay-sized sediments in marine and estuarine environments (Abd-Allah et al 2009; Dias and Alves 2009). Interestingly, researchers like Nelson (1983) and Spagnoli et al (2010) have stated that near-shore sediments are coarse-grained and less organic in nature, whereas offshore sediments are organic-rich and fine-grained due to hydrological regime (i.e., the varying physics of the water movement, primarily due to wind-induced currents, and the physical and metabolic activity of the larger organisms), as suggested by earlier researchers (Ergin and Bodur 1999;Magni et al 2002). Furthermore, the grain-size distribution characteristics and SSA of the sediments are strongly related to the concentration of the sediment-bound trace elements and retention characteristics of the sediment particles.…”

Section: Physical Characterizationmentioning

confidence: 91%

Characterization of Sediments for Sustainable Development: State of the Art

Sharma

Singh

2014

Marine Georesources & Geotechnology

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Sediments are the particulate matter that are transported by the flow of water and eventually get deposited at the bottom of water bodies, such as oceans, rivers, lagoons, and so forth. The deposition of these materials due to continued intervention of natural as well as anthropogenic activities is a serious concern as the storage capacity (or health) of the system is reduced or otherwise affected. Keeping in view the emerging challenges associated with proper disposal and subsequent utilization of sediments, as a manmade resource, their extraction from such locations becomes necessary. Hence, it is essential to characterize the sediments in order to devise strategies to exploit them as a manmade resource in the best possible manner. With this in view, this article highlights the importance of different attributes and aspects of the sediments (viz., physical, chemical, morphological, geotechnical, toxicological, and microbial characteristics) deposited in the water bodies that will help in assessing their potential as a substitute material to natural resources.

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Silt/clay fractionation in surficial Marmara sediments: implication for water movement and sediment transport paths in a semi-enclosed and two-layered flow system (northeastern Mediterranean Sea)

Cited by 21 publications

References 10 publications

Sediment Analysis Evidences Two Different Depositional Phenomena Influencing Seagrass Distribution in the Gulf of Oristano (Sardinia, Western Mediterranean)

Sediment Analysis Evidences Two Different Depositional Phenomena Influencing Seagrass Distribution in the Gulf of Oristano (Sardinia, Western Mediterranean)

Strong Acid Mixture and Sequential Geochemical Arsenic Extractions in Surface Sediments from the Santa Maria La Reforma Coastal Lagoon, Mexico: A Bioavailability Assessment

Characterization of Sediments for Sustainable Development: State of the Art

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