scholarly journals Distribution, Mobility and Fate of Trace Elements in an Estuarine System Under Anthropogenic Pressure: the Case of the Karstic Timavo River (Northern Adriatic Sea, Italy)

2021 ◽  
Author(s):  
Elena Pavoni ◽  
Matteo Crosera ◽  
Elisa Petranich ◽  
Jadran Faganeli ◽  
Katja Klun ◽  
...  
Keyword(s):  
Trace Elements ◽  
Surface Sediments ◽  
Suspended Particles ◽  
Critical Conditions ◽  
Residual Fraction ◽  
Secondary Source ◽  
Estuarine System ◽  
Anthropogenic Pressure ◽  
Water Interface ◽  
Northern Adriatic

AbstractThe accumulation of contaminants and their potential mobility represent two of the main environmental issues facing coastal environments. Sediments often act as “reservoirs” of contaminants, including potentially toxic trace elements, but they can also be considered a secondary source of contamination due to remobilisation processes at the sediment-water interface which may affect the quality of the coastal water and aquatic biota. This research aims to provide a geochemical characterisation of the estuarine system of the Timavo/Reka River, focusing on the occurrence of trace elements in different environmental matrices with the purpose of highlighting potential critical conditions in terms of environmental quality. The surface sediments were found to be enriched in several trace elements especially in the innermost sector of the area. There, sulphate-reductive conditions in the bottom saltwater testify to potential anoxia at the sediment-water interface, driving trace element accumulation in the residual fraction of the sediments. However, Fe and Mn redox behaviour appears to play a crucial role in the recycling of dissolved trace elements in the water column. With the lone exception of the saltwater in the innermost sector, trace elements were found to be mainly associated with suspended particles due to oxidation and precipitation processes, whereas a common lithogenic origin was identified for Cr, Ni, and Co, which are significantly correlated both in the surface sediments and in the suspended particles.

Distribution and sources of aliphatic hydrocarbons in surface sediments of Sergipe River estuarine system

2012 ◽  
Vol 64 (8) ◽  
pp. 1721-1725 ◽  
Author(s):  
Manoel B. Lima ◽  
Elaine A. Feitosa ◽  
Elissandro S. Emídio ◽  
Haroldo S. Dórea ◽  
Marcelo R. Alexandre
Keyword(s):  
Surface Sediments ◽  
Aliphatic Hydrocarbons ◽  
Estuarine System ◽  
River Estuarine

Multiple stressors in an estuarine system: Effects of nutrients, trace elements, and trophic complexity on benthic photosynthesis and respiration

Estuaries ◽  
2002 ◽  
Vol 25 (1) ◽  
pp. 57-69 ◽  
Author(s):  
Andrew E. Laursen ◽  
Sybil P. Seitzinger ◽  
Robert Dekorsey ◽  
James G. Sanders ◽  
Denise L. Breitburg ◽  
...  
Keyword(s):  
Trace Elements ◽  
Multiple Stressors ◽  
Estuarine System ◽  
Photosynthesis And Respiration

scholarly journals Linking patterns of freshwater discharge and sources of organic matter within the Río de la Plata estuary and adjacent marshes

2017 ◽  
Vol 68 (9) ◽  
pp. 1704 ◽  
Author(s):  
Leandro Bergamino ◽  
Mark Schuerch ◽  
Adriana Tudurí ◽  
Silvina Carretero ◽  
Felipe García-Rodríguez
Keyword(s):  
Organic Matter ◽  
Surface Sediments ◽  
Sediment Cores ◽  
Freshwater Discharge ◽  
C3 Plants ◽  
Estuarine System ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
Matter Transport

We investigated carbon isotopic ratios (δ13C) v. carbon to nitrogen (C : N) ratios for surface sediments throughout a large estuarine system (Río de la Plata, RdlP), combined with sediment cores from adjacent marshes to infer main carbon sources. We also evaluated the influence of the El Niño–Southern Oscillation (ENSO) and associated high freshwater-discharge events on the organic-matter transport within the estuary. The isotopic pattern in surface sediments of the RdlP showed the upper reaches to be influenced by riverine particulate matter (δ13C range: –24 to –26‰). Similarly, in the sediment cores from marshes of the upper reaches, δ13C values decreased from –24‰ in ancient sediments to –28‰ in recent sediments, reflecting an increased contribution of organic matter from land, including C3 plants and freshwater phytoplankton, during the past 50 years. However, the lower reaches represent a depositional environment of marine algae (δ13C range: –21 to –23‰), with no influence of detritus from adjacent marshes, indicating minor erosion of the marshes in the lower reaches operating as carbon-sink habitats. Our isotopic analysis showed that the transport and deposition of terrigenous organic matter within the RdlP and adjacent marsh habitat appear to be both temporally and spatially linked to hydrology patterns.

scholarly journals Behaviour of Metal(loid)s at the Sediment-Water Interface in an Aquaculture Lagoon Environment (Grado Lagoon, Northern Adriatic Sea, Italy)

2021 ◽  
Vol 11 (5) ◽  
pp. 2350
Author(s):  
Elisa Petranich ◽  
Matteo Crosera ◽  
Elena Pavoni ◽  
Jadran Faganeli ◽  
Stefano Covelli
Keyword(s):  
Sediment Cores ◽  
Fish Farm ◽  
Trophic Chain ◽  
Water Interface ◽  
Northern Adriatic Sea ◽  
Overlying Water ◽  
Northern Adriatic ◽  
In Situ Experiments ◽  
Diffusive Fluxes ◽  
Lagoon Environment

The cycling of metal(loid)s at the sediment–water interface (SWI) was evaluated at two selected sites (VN1 and VN3) in an active fish farm in the Grado Lagoon (Northern Adriatic, Italy). In situ experiments using a transparent benthic chamber and the collection of short sediment cores were performed, to investigate the behavior of metal(loid)s in the solid (sediments) and dissolved (porewaters) phases. Total and labile concentration of metal(loid)s were also determined in sediments, to quantify their potential mobility. Comparable total concentrations were found at both sites, excluding As, Mn, Pb and V, which were higher at VN3. Metal(loid) porewater profiles showed a diagenetic sequence and a close dependence with redox (suboxic/anoxic) conditions in the surface sediments. Positive diffusive fluxes along with benthic fluxes, particularly at the more oxic site, VN1, were found for almost all metal(loid)s, indicating their tendency to migrate towards the overlying water column. Despite sediments at two sites exhibiting high total metal(loid) concentrations and moderate effluxes at the SWI, the results suggest that they are hardly remobilized from the sediments. Recycling of metal(loid)s from the SWI would not constitute a threat for the aquatic trophic chain in the fish farm.

scholarly journals Speciation Variation and Comprehensive Risk Assessment of Metal(loid)s in Surface Sediments of Intertidal Zones

2018 ◽  
Vol 15 (10) ◽  
pp. 2125 ◽  
Author(s):  
Baocui Liang ◽  
Xiao Qian ◽  
Shitao Peng ◽  
Xinhui Liu ◽  
Lili Bai ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Surface Sediments ◽  
Yellow River ◽  
Biological Effects ◽  
Risk Index ◽  
Sediment Quality ◽  
Residual Fraction ◽  
Intertidal Zones ◽  
Probable Effect Level ◽  
Effect Level

Speciation variation and comprehensive risk assessment of metal(loid)s (As, Cd, Cr, Cu, Mn, Ni, Pb and Zn) were investigated in surface sediments from the intertidal zones of the Yellow River Delta, China. Results showed that only the concentrations of As, Cd and Pb were significantly different between April and September (p < 0.01). In April, the residual fraction (F4) was predominant for As, Cr, Cu, Ni and Zn. However, the exchangeable and carbonate-associated fraction (F1) was dominant for Cd averaging 49.14% indicating a high environmental risk. In September, the F4 fraction was predominant and the F1 fraction was very low for most metal(loid)s except Cd and Mn. The geo-accumulation index (Igeo), the F1 fraction and potential ecological risk index (PERI) of most metal(loid)s were relatively low in surface sediments for both seasons. But Pb, As and Ni were between the threshold effect level (TEL)and the probable effect level (PEL) for 66.67%, 83.33% and 91.67% in April and As and Ni were between TEL and PEL for 41.67% and 91.67%, which indicated that the concentration of them was likely to occasionally exhibit adverse effects on the ecosystem. Although the Igeo, the F1 fraction or PERI of Cd in both seasons was higher at some sites, the results of sediment quality guidelines (SQGs) indicated that the biological effects of Cd were rarely observed in the studied area.

Ecological risk assessment using trace elements from surface sediments of İzmit Bay (Northeastern Marmara Sea) Turkey

2004 ◽  
Vol 48 (9-10) ◽  
pp. 946-953 ◽  
Author(s):  
Hakan Pekey ◽  
Duran Karakaş ◽  
Savaş Ayberk ◽  
Leyla Tolun ◽  
Mithat Bakoǧlu
Keyword(s):  
Risk Assessment ◽  
Trace Elements ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Surface Sediments ◽  
Marmara Sea ◽  
Izmit Bay

Organotin compounds in touristic marinas of the northern Adriatic Sea: occurrence, speciation and potential recycling at the sediment-water interface

2019 ◽  
Vol 26 (30) ◽  
pp. 31142-31157 ◽  
Author(s):  
Malgorzata M. Formalewicz ◽  
Federico Rampazzo ◽  
Seta Noventa ◽  
Claudia Gion ◽  
Elisa Petranich ◽  
...  
Keyword(s):  
Adriatic Sea ◽  
Organotin Compounds ◽  
Water Interface ◽  
Northern Adriatic Sea ◽  
Northern Adriatic
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