Effect of dissolved organic carbon and salinity on flocculation process of heavy metals during mixing of the Navrud River water with Caspian Seawater

Samani, Ali Riahi; Karbassi, Abdolreza; Fakhraee, Mojtaba; Heidari, Mehdi; Vaezi, Alireza; Valikhani, Z.

doi:10.1080/19443994.2014.920730

Cited by 22 publications

(6 citation statements)

References 32 publications

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“…This observation is supported 345 by recent studies, which demonstrate the importance of metal-organic matter aggregates in land-to-sea transfer of trace metals, particularly in boreal environments (Jokinen et al, 2020). When riverine dissolved organic matter is transformed to particulate form as it is discharged to the sea, dissolved metals are also transformed to particulate form, and passively enclosed in the produced metal-organic matter aggregates (Stolpe and Hassellöv, 2007;Valikhani Samani et al, 2015;Herzog et al, 2020).…”

Section: Metal Transport Mechanismsmentioning

confidence: 65%

Enrichment of trace metals from acid sulphate soils in sediments of the Kvarken Archipelago, eastern Gulf of Bothnia, Baltic Sea

Virtasalo¹,

Österholm²,

Kotilainen³

et al. 2020

Preprint

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Abstract. Rivers draining the acid sulphate soils of western Finland are known to deliver large amounts of trace metals with detrimental environmental consequences to the recipient estuaries in the eastern Gulf of Bothnia, northern Baltic Sea. However, the distribution of these metals in the coastal sea area, and the relevant metal transport mechanisms have been less studied. This study investigates the spatial and temporal distribution of metals in 9 sediment cores, collected from the Kvarken Archipelago, which is the recipient of Laihianjoki and Sulvanjoki Rivers that are impacted by acid sulphate soils. The contents of Cd, Co, Cu, La, Mn, Ni and Zn increase in the cores during the 1960s and 1970s as a consequence of intensive artificial drainage of the acid sulphate soil landscape. The metal deposition has remained at the high level since the 1980s. The metal enrichment in seafloor sediments is currently visible at least 25 km seaward from the river mouths. Comparison to sediment quality guidelines shows that the metal contents are very likely to cause detrimental effects on marine biota more than 12 km out from the river mouths. The dynamic sedimentary environment of the shallow archipelago makes these sediments potential future sources of metals to the ecosystem. Finally, the strong association of metals and nutrients to the same sediment grain size class of 2–6 µm indicates that the transformation of dissolved organic matter and metals to metal-organic aggregates at the river mouths is the key mechanism of seaward trace metal transport, in addition to co-precipitation with Mn-oxyhydroxides identified in previous studies. The large share of terrestrial organic carbon of the total organic C in these sediments (interquartile range = 39–48 %) highlights the importance of riverine organic matter supply. These findings are important for the estimation of environmental risks and the management of biologically-sensitive coastal sea ecosystems.

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Section: Metal Transport Mechanismsmentioning

confidence: 65%

Enrichment of trace metals from acid sulphate soils in sediments of the Kvarken Archipelago, eastern Gulf of Bothnia, Baltic Sea

Virtasalo¹,

Österholm²,

Kotilainen³

et al. 2020

Preprint

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“…Alguns autores demonstraram que a fl oculação da matéria orgânica dissolvida em ambientes estuarinos pode aumentar a sedimentação de complexos de metais orgânicos derivados de ecossistemas terrestres (Sholkovitz, 1978;Sholkovitz et al, 1978;Wells et al, 2000;Turner et al, 2002;Stolpe e Hassellöv, 2007;Bia� et al, 2010;Samani et al, 2014;Heidari, 2019). Como visto na Figura 3, os dados de concentração total de metais-traço revelaram dois padrões de distribuição.…”

Section: Resultsunclassified

Extração sequencial BCR para frações geoquímicas e avaliação de Zn, Ni, Cd, Cu e Pb nos sedimentos costeiros no Complexo Portuário de Santos, Sudeste do Brasil

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Lima

Vieira

et al. 2023

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As variações da coluna d'água no ambiente aquático, motivadas por processos naturais ou antropogênicos, podem afetar a estabilidade de metais-traço no sedimento do Complexo Portuário de Santos (CPS), localizado no sudeste do Brasil. Metais-traço, como Cu, Zn, Ni, Pb e Cd, podem afetar negativamente os compartimentos ecológicos e biológicos da água estuarina. Para avaliar a condição do sedimento do CPS, este artigo investigou a fração geoquímica de metais-traço sedimentares aplicando a abordagem de extração sequencial BCR (European Community Bureau of Reference - Gabinete de Referência da Comunidade Europeia). A matéria orgânica e o tamanho de grão fino, característicos de um ambiente estuarino, mostraram uma influência direta na dinâmica de concentração de metais-traço em sedimentos, especialmente para Pb, Cd e Ni. No caso específico de Zn e Cu, havia uma possível fonte de contaminação no porto. A maior fração dos metais estudados era não residual, potencialmente mobilizável em um ambiente em que a variação dos parâmetros físico-químicos da coluna d'água é altamente variável, algo frequente em ambientes estuarinos. Palavras-chave: especiação de metais-traço; Porto de Santos; sedimento; impacto ambiental.

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“…The salinity is found to be lowest in summer, in Babughat (S5) when tidal magnitude or influx is expected to be higher compared to other (Sadhuram et al 2005;Mukhopadhyay et al 2006). This indicates that increased magnitude of tidal influx rarely influences salinity of river Hooghly near Kolkata ) and flocculation of dissolved PTEs at lower saline regime (Samani et al 2015).…”

Section: Regulation Of Physicochemical Parameters Of River Hooghlymentioning

confidence: 94%

“…A similar pattern of steep salinity gradient is also evident in river Hooghly, as it is a funnel-shaped wide mouthed macro-tidal river (Mukhopadhyay et al 2006;Rudra 2014). This salinity gradient might be regulating the flocculation of dissolved PTEs, which affects the elemental composition of the river (Samani et al 2015). Irrespective of the season, the salinity of samples collected from Babughat (S5), the sampling station near Kolkata varies between 0.09 and 0.12.…”

Section: Regulation Of Physicochemical Parameters Of River Hooghlymentioning

confidence: 99%

“…Moreover, the downstream of river Hooghly is also dominated by mangrove forests, which acts as a major source of DOC. Samani et al (2015) pointed out that DOC (hydrophobic humic materials) plays a crucial role in the flocculation of PTEs because of salinity gradient. Higher concentrations of Al and Fe are evident as dissolved toxic elements in all of the sampling stations of river Hooghly as Al and Fe are major constituents of the earth crust (Mitra et al 2018b).…”

Section: Regulation Of Geospatial Distribution Of Ptesmentioning

confidence: 99%

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Spatiotemporal distribution of potentially toxic elements in the lower Gangetic delta and their implications for non-carcinogenic health risk management

et al. 2021

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River Hooghly, a tributary of river Ganges is one of the major rivers of Asia having traditional, social, economic, religious, and spiritual values. Water samples were collected from 18 sampling locations of river Hooghly during summer (dry), monsoon (wet), and winter (cold) seasons. The samples are analysed for basic physicochemical properties and abundance of selected potentially toxic elements (PTEs) are measured. Several PTEs, e.g., Al, Fe, Ni, and Pb, were found to be above the permissible limits, prescribed by national and international guidelines for safe human consumption. The trend of variation in the mean PTE concentrations showed the following order: Cd < Pb < Co < Cr < Ni < Cu < Zn < Mn < Fe. Due to the presence of high total dissolve solid (TDS) and PTE contents, the water quality of river Hooghly is not suitable for direct human consumption. The evaluated Water Quality Index (WQI) value showed a distinct spatio-temporal variation indicating very severe condition of water quality, which is deteriorating gradually from upstream to downstream. In summer, monsoon, and winter, the highest WQI values were observed in Maushuni Island (S15), Petuaghat (S18), and Tapoban (S17), respectively. However, the non-carcinogenic human health risk in terms of Hazard Quotient and Hazard Index values of PTEs indicates no immediate adverse impact on human health due to exposure of PTE contaminated water from river Hooghly through ingestion or dermal route. Though, these risk values for children were higher than adults warranting the adoption of a long-term management plan to cope with potential human health risks. The result suggests implementation of a combination of stringent socio-legal regulations and numerical models for sustainable water related health risk management in river Hooghly.

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Effect of dissolved organic carbon and salinity on flocculation process of heavy metals during mixing of the Navrud River water with Caspian Seawater

Cited by 22 publications

References 32 publications

Enrichment of trace metals from acid sulphate soils in sediments of the Kvarken Archipelago, eastern Gulf of Bothnia, Baltic Sea

Enrichment of trace metals from acid sulphate soils in sediments of the Kvarken Archipelago, eastern Gulf of Bothnia, Baltic Sea

Extração sequencial BCR para frações geoquímicas e avaliação de Zn, Ni, Cd, Cu e Pb nos sedimentos costeiros no Complexo Portuário de Santos, Sudeste do Brasil

Spatiotemporal distribution of potentially toxic elements in the lower Gangetic delta and their implications for non-carcinogenic health risk management

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