Behaviour of arsenic on the continental shelf off the Gironde estuary: Role of phytoplankton in vertical fluxes during spring bloom conditions

Michel, Pierre; Boutier, Bernard; Herbland, Alain; Averty, Bernard; Artigas, Luis Felipe; Auger, Dominique; Chartier, Emanuelle

doi:10.1016/s0399-1784(98)80019-4

Cited by 29 publications

(17 citation statements)

References 25 publications

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“…The flux of DI-As in the Anllóns River is small compared with that of other temperate rivers: it is one order of magnitude lower than the flux calculated for the Thames and Adour (Point et al, 2007) whilst it is two orders of magnitude lower than contributions of the Seine (Michel et al, 1999), Loire (Seyler and Martin, 1990), Garonne (Michel et al, 1998), Rhone (Guieu et al, 1991) and Humber (Kitts et al, 1994). Although, to draw a meaningful comparison, this output must by normalized with respect to the area of the river basin; if it is done the DI-As of the Anllóns (0.83 kg s -1 km -2…”

Section: Discussion 41 the Fluvial Reservoirmentioning

confidence: 60%

Land–ocean contributions of arsenic through a river–estuary–ria system (SW Europe) under the influence of arsenopyrite deposits in the fluvial basin

Costas

Prego²,

Filgueiras³

et al. 2011

Science of The Total Environment

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Abstract. Water was sampled monthly from September 2005 to August 2006 at 14 stations distributed throughout the coastal system of Anllóns-Laxe, from where 30 surface sediment samples were also taken. After filtration through 0.22 m polycarbonate filters, dissolved inorganic and total arsenic (UV oxidation) concentration was determined by HG-AFS. After microwave digestion, the arsenic in SPM and sediment was determined by AAS. Ultra-clean procedures were adopted during sampling, handling and analysis and the analytical accuracy was checked using CRM. Spatial distribution of As in water (0.2-4.0 g L -1 ), SPM (21-169 mg kg -1 ) and sediment of the river reservoir was altered by the presence of arsenopyrite deposits in the middle fluvial basin that increases 2.1±0.5 and 1.7±0.5 times the concentrations of inorganic dissolved (DI-As) and particulate (P-As) arsenic, respectively. At the termination fluvial zone As fluxes can be calculate to be: [DI-As]=7.09 Q -0.69. The Anllóns River exports to its estuary 460 kg a -1 of dissolved (<7% as organic) arsenic annually. It is higher (i.e. 0.83 kg s -1 km -2 of DI-As) than that of most of European rivers. In the estuary reservoir, the influence of arsenopyrite is also evident as the river concentration of DI-As, which was lower than in seawater during the wet season and higher during the dry season. Arsenic has non-conservative behaviour, as in other European estuaries, but the Anllóns shows an ambivalent pattern: as it usually gain DI-As during the wet season and loses it during the dry season, while P-As seems to behave contrary to the DI-As. When the fluvial arsenic reaches the ria its concentration varies due to the estuarine processes. In the wet season DI-As increases its concentration by one third while in the dry season it decreases by one fifth and the annual contribution to the ria is 10% higher than the fluvial output. In the case of P-As more data are necessary to quantify its behaviour; however, the estuarine sediments are contaminated by arsenic. In the ria reservoir DI-As levels were similar to those of the ocean, DO-As comprises 9-22% of the inorganic, P-As ranges from 3 to 40 mg kg -1 , and As-sedimentary can classified as uncontaminated (4-18 mg kg -1 ), except in the fishering ports. The ria circulation, reinforced by upwelling favours the exportation of arsenic to the ocean. In the Anllóns-Laxe system as a whole, the freshwater-saline interface processes do not lead to a decrease in the dissolved fluvial arsenic flux to the ocean.

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Section: Discussion 41 the Fluvial Reservoirmentioning

confidence: 60%

Land–ocean contributions of arsenic through a river–estuary–ria system (SW Europe) under the influence of arsenopyrite deposits in the fluvial basin

Costas

Prego²,

Filgueiras³

et al. 2011

Science of The Total Environment

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“…In addition to the well-characterized arsenic species discussed above in estuaries and seawater, there are also reports of unidentified arsenic species in water (58,76,(83)(84)(85)(86). After UV-irradiation of surface water from Uranouchi Inlet, the inorganic and dimethylarsenic concentrations detected with hydride generation rapidly increased (83).…”

Section: Uncharacterized Arsenic Speciesmentioning

confidence: 92%

“…Michel et al reported a difference between the sum of known arsenic species and total arsenic of 13% in the euphotic layer of an estuary (86). These studies suggest that substantial amounts of arsenic remain to be characterized.…”

Section: Uncharacterized Arsenic Speciesmentioning

confidence: 98%

Arsenic Speciation in Natural Waters

Watt¹,

Le²,

Yong³

et al. 2002

ACS Symposium Series

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Speciation studies are necessary to understand the biogeochemical cycling of arsenic in aquatic systems. The species of arsenic present, their behaviour and toxicity will change depending on the biotic and abiotic conditions in the water. In groundwater, arsenic is predominantly present as arsenite (As III ) and arsenate (As V ). The major arsenic species in freshwater are As III and As V and minor amounts of MMA , DMA and methylated As III have also be detected. In seawater, the arsenic speciation differs in the surface and deep zone. In addition to the above species, uncharacterized arsenic species may constitute a significant portion of the total arsenic present in some water and the identification of these compounds is necessary to fully understand the arsenic biogeochemistry in water.A knowledge of the speciation of As in natural water is important because the bioavailability and the physiological and toxicologial effects of As depend on its chemical forms. Arsenic occurs in a variety of chemical forms in water, and this is a result of many chemical and biological transformations in the aquatic environment. The mechanism of transport and biological availability of arsenic depends on the chemical species present.The main arsenic compounds detected in natural waters are arsenite [As 111 ],

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“…A steady-state box model based on the LOICZ Biogeochemical Modelling Guidelines was used to This study 2-8/1991 5-60 (19) 0-42 (5) Xiao et al 1996Xiao et al 10/19802) Zhang 1982 16.4-21.4 (18.2) 4.7-16.0 (8.9) Li et al 1981Bohai Bay, China 8/1980, 198113.3-60.1 (25.4) Li et al 1984Laizhou Bay, China 5,8/2002.5) Ma et al 2003Xiamen Harbor, China 8/1988.7) Li et al 2002Li et al 8/2000 34-58 (during typhoon) Biscayne Bay, USA 1993 (9.2) (0.4) Valette-Silver et al 1999Charleston Harbor, South Carolina 9/1998-9/1999 Zhang 1996Huanghe Estuary 5/1985, 19863.8-28.8 Zhang 19968/1985, 198617.8-38.8 Changjang 1986(10.6) Elbaz-Poulichet et al 1990Zhang et al 1990Changjiang Estuary 8/2002-5/2003 0.05-6.8 (1.79) Cheng et al 2006 Pearl River Estuary 11/1992 26.7-36.0 (30.7) Rhône Estuary, France 3/1984, 7/1987, 7/198814.7-50.7 (29.4) Seyler and Martin 1990Gironde Estuary, France 5/1994 0.2-3.9 (1.8) Michel et al 1997Lena, Russia 9/1989 (2) Martin et al 1993 North Atlantic (surface) 8 Central North Sea 8/19889.73-14.80 (11.39) Millward et al 19969/1989 construct a TDIAs budget for Jiaozhou ...…”

Section: Arsenic Budgetmentioning

confidence: 99%

Speciation and Seasonal Variations of Dissolved Inorganic Arsenic in Jiaozhou Bay, North China

Ren

Zhang

et al. 2007

Water Air Soil Pollut: Focus

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The distributions and biogeochemical cycles of arsenic in the aquatic environment have captured the interest of geochemists due to arsenic's multiple chemical forms, the toxicity of certain arsenic species and large anthropogenic input. Seasonal variations in the dissolved inorganic arsenic concentration and speciation in Jiaozhou Bay, which is located on the west coast of the Yellow Sea in northern China, are presented here. Three cruises were carried out in Jiaozhou Bay under varying tidal regimes, one at neap tide and one at spring tide in August and one at spring tide in October of 2001. In addition to the transect surveys, the main sources of dissolved inorganic arsenate and arsenite in Jiaozhou Bay, including riverine input from five major tributary rivers, atmospheric dry and wet depositions, and groundwater and wastewater input, were collected in different seasons to estimate arsenic transport through different sources. The mean concentrations of total dissolved inorganic arsenic (TDIAs, As (V+III)) in Jiaozhou Bay were statistically comparable between summer and autumn, with higher concentrations at the northwest and northeast parts of the bay, reflecting human activities. The As (III)/TDIAs ratio ranged between 0.045 and 0.68, with an average of 0.16, implying that arsenate was the dominating species in Jiaozhou Bay. A preliminary box model was established to estimate the water-mass balance and arsenic budgets for Jiaozhou Bay, which demonstrated that river inputs and atmospheric depositions were the main sources of arsenic into Jiaozhou Bay. The concentrations of dissolved inorganic arsenic in Jiaozhou Bay have decreased in the last two decades. Compared with other areas in the world, the concentration of arsenic in Jiaozhou Bay remains at the natural level and this region can be characterized as a less disturbed area.

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Behaviour of arsenic on the continental shelf off the Gironde estuary: Role of phytoplankton in vertical fluxes during spring bloom conditions

Cited by 29 publications

References 25 publications

Land–ocean contributions of arsenic through a river–estuary–ria system (SW Europe) under the influence of arsenopyrite deposits in the fluvial basin

Land–ocean contributions of arsenic through a river–estuary–ria system (SW Europe) under the influence of arsenopyrite deposits in the fluvial basin

Arsenic Speciation in Natural Waters

Speciation and Seasonal Variations of Dissolved Inorganic Arsenic in Jiaozhou Bay, North China

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