Arsenic speciation in surface waters and sediments in a contaminated waterway: an IC–ICP-MS and XAS based study

Gault, A. G.; Polya, David A.; Lythgoe, Paul R.; Farquhar, Morag L.; Charnock, John; Wogelius, R. A.

doi:10.1016/s0883-2927(03)00058-1

Cited by 36 publications

(18 citation statements)

References 38 publications

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“…Selective sequential extraction (SSE) has been applied to determine the solid phase speciation of heavy metals (Mulligan & Dahr Azma 2003). It has also been used for As speciation (Gault et al 2003;Van Herreweghe et al 2003). However, sequential extractions determine only operationally defined fractions.…”

Section: As Speciationmentioning

confidence: 99%

Effect of natural organic matter on arsenic release from soils and sediments into groundwater

Wang

Mulligan

2006

Environ Geochem Health

407

187

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Arsenic (As) contamination in groundwater has received significant attention recently. Natural and anthropogenic sources contribute to the worldwide occurrence of As contamination. As speciation is an important factor related to its toxic and mobile behavior. The release of As from soils and sediments into groundwater is governed by several geophysicochemical processes, of which, As sorption behavior is of principle significance. This review paper summarizes existing information regarding the effects of natural organic matter (NOM) on the fate and mobility of As species in the environment. NOM may enhance the release of As from soils and sediments into the soil solution, thereby facilitating As leaching into the groundwater. The main influencing mechanisms include competition for available adsorption sites, formation of aqueous complexes, and/or changes in the redox potential of site surfaces and As redox speciation. NOM may also serve as binding agents, thereby reducing As mobility. However, comparably little research has been performed on this aspect. Since most investigations have been done on purified minerals under laboratory conditions, further research involving various geological materials under natural environmental conditions is required. Development of proper geochemical conceptual models may provide means of predicting the role of NOM in arsenic leaching and/or immobilization.

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Section: As Speciationmentioning

confidence: 99%

Effect of natural organic matter on arsenic release from soils and sediments into groundwater

Wang

Mulligan

2006

Environ Geochem Health

407

187

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“…Consequently, partition ratios of iron-associated elements (Pb, V, As) is operationally defined, and does not reflect real partitioning of metal forms. It has already been shown that Pb and As are preferably associated to the Al and/or Fe oxyhydroxides (Gault et al, 2003;Casiot et al, 2005Casiot et al, , 2009Butler et al, 2009) in AMD waters even at much lower pH than measured on site R1. High association of As and Pb to particulate Fe is evident on site R2.…”

Section: −1mentioning

confidence: 84%

Distribution and chemical speciation of arsenic and heavy metals in highly contaminated waters used for health care purposes (Srebrenica, Bosnia and Herzegovina)

Lenoble

Omanović

Garnier

et al. 2013

Science of The Total Environment

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To cite this version:Véronique Lenoble, D Omanović, Cédric Garnier, Stéphane Mounier, N Đonlagić, et al.. Distribution and chemical speciation of arsenic and heavy metals in highly contaminated waters used for health care purposes (Srebrenica, Bosnia and Herzegovina). Science of the Total Environment, Elsevier, 2013Elsevier, , 443, pp.420-428. <10.1016Elsevier, /j.scitotenv.2012 H I G H L I G H T S► Acid mine drainage type waters used for decades for healthcare purposes were analysed. ► Extremely high contents of As (up to 6.6 mg/L) and other heavy metals were registered. ► Acidic springs decreased pH of the river from 7.3 to 3.4 in only 1.5 km distance. ► Geochemical modelling revealed dominance of oxidized forms of all elements. Determination of distribution and chemical speciation of arsenic and heavy metals in five acidic springs and in the receiving river near Srebrenica (Bosnia and Herzegovina) was carried out. These waters were used for centuries, and continue to be used, for health-care purposes. The composition and properties of all springs and the river water (after all inputs) resembled that of an acid mine drainage. Very low pH (b 3.3), high sulphate concentration and extremely high contents of most of the measured elements (25) are found in all springs (e.g. arsenic and iron maximal concentration of 6.6 and 500 mg L −1 , respectively). Although of small discharge, spring waters caused the decrease of the receiving river pH (from 7.3 to 3.4) and the considerable increase of the concentrations of elements. The enrichment factor for the studied elements ranged from 1.2 for Sr up to 425 for As. In acidic spring waters, all elements were predominantly present in dissolved form. Elements associated to freshly-formed hydrous ferric oxide were prevailing in particulate forms only at the two most upstream sites in the river with pH > 7. Geochemical speciation modelling (PHREEQC and WHAM-VI) revealed that As was mainly present as As(V), and Fe as Fe(III). Complexation of dissolved metals by organic matter was predicted to be significant only for the two river sites with neutral pH. a b s t r a c t a r t i c l e i n f o

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“…1b). The increase in the proportion of As(III), may, however be rationalized by considering the different adsorptive behavior exhibited by As(III) and As(V) on (oxyhydr)oxides (Gault et al 2003). As preferentially sorbs onto Fe and Mn (oxyhydr)oxides, which are widely available.…”

Section: Inorganic Arsenic Speciationmentioning

confidence: 99%

Chemical speciation and ecological risk assessment of arsenic in marine sediments from Izmir Bay (Eastern Aegean Sea)

Gonul

2015

Environ Sci Pollut Res

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Total arsenic, arsenic(III) and (V), Fe, and Mn were measured in 17 surface sediment samples from Izmir Bay. The concentrations and ecological risk of As were characterized in the sediment affected by urban and agricultural activities. Total As ranged from 8.87 to 28.3 μg g(-1) dry weight (96.5-99.9 % as inorganic As). Distribution of total As and total As/Fe followed a different trend in sediments at all sampling sites. Arsenite (As(III)) was the most dominant form followed by As(V), while organic arsenic represented a minor constituent (0.03 to 3.49 %). The highest concentration of total As was observed at Gediz River estuary and exceeded lower threshold value (threshold effects level (TEL)). Due to the biological reduction of As(V) and abundance of Fe (oxyhydr)oxides in the sediments, most inorganic As in the Izmir Bay was present as As(III). Besides, the levels of As were >TEL and

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Arsenic speciation in surface waters and sediments in a contaminated waterway: an IC–ICP-MS and XAS based study

Cited by 36 publications

References 38 publications

Effect of natural organic matter on arsenic release from soils and sediments into groundwater

Effect of natural organic matter on arsenic release from soils and sediments into groundwater

Distribution and chemical speciation of arsenic and heavy metals in highly contaminated waters used for health care purposes (Srebrenica, Bosnia and Herzegovina)

Chemical speciation and ecological risk assessment of arsenic in marine sediments from Izmir Bay (Eastern Aegean Sea)

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