Arsenic and selenium in some Vietnamese acid sulphate soils

Gustafsson, Jon Petter; Tin, Nguyen Thanh

doi:10.1016/0048-9697(94)90171-6

Cited by 25 publications

(12 citation statements)

References 9 publications

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“…As the redox potential decreased and iron oxides were subjected to reductive dissolution, arsenic sorbed to the oxide phases in the soil was released into solution. Iron-arsenic geochemistry in the reduced soil mixture displayed similar interactions previously described in the literature (Gustafsson and Tin 1994;McGeehan and Naylor 1994;McGeehan 1996;Reynolds et al 1999;Welch et al 2000; and references therein).…”

Section: Resultssupporting

confidence: 67%

Release of arsenic and molybdenum by reductive dissolution of iron oxides in a soil with enriched levels of native arsenic

Bennett¹,

Dudas²

2003

Journal of Environmental Engineering and Science

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This study examined the release of arsenic (As), molybdenum (Mo), and iron (Fe) into the aqueous phase during reductive dissolution of iron oxides in an amended acid sulfate soil naturally enriched in arsenic. These acid sulfate soils occur worldwide and have a significant distribution in parts of Alberta and British Columbia. Reactions were studied in incubation vessels under controlled laboratory conditions. Soils were driven anaerobic by stimulation of indigenous bacteria using a glucose addition and then periodically analyzed for redox potential (Eh), pH, electrical conductivity, and aqueous concentrations of Fe, As, Mo, and other chemical species. Dissolution of iron oxides was pronounced when Eh values dropped to below +100 mV. With dissolution, concentrations of Fe, As, and Mo increased in the solution phase. Aqueous As concentrations increased from 0.87 to 119 µg L −1 during a reduction period of 48 d. Molybdate (MoO 2− 4 ), an oxyanion similar to arsenate, also closely followed the release of Fe and As into solution during the incubation.The results indicate both As and Mo behave similarly in response to the dissolution of soil iron oxides under reducing conditions and that their aqueous phase concentrations are largely controlled by dissolution and desorption from the iron oxide host.Résumé : Cette étude examine la libération d'arsenic (As), de molybdène (Mo) et de fer (Fe) dans la phase aqueuse lors de la dissolution des oxydes de fer dans un sol sulfaté acide amendé naturellement riche en arsenic. Ces sols sulfatés acides se retrouvent partout dans le monde et sont aussi très répandus dans certaines parties de l'Alberta et de la Colombie-Britannique. Les réactions ont été étudiées dans des vaisseaux d'incubation sous des conditions contrôlées en laboratoire. Les sols ont été rendus anaérobies par la stimulation des bactéries indigènes par l'ajout de glucose; l'Eh, le pH, la conductivité électrique et les concentrations aqueuses de Fe, As, Mo et d'autres éléments chimiques ont ensuite été analysés périodiquement. La dissolution des oxydes de fer était prononcée lorsque les valeurs d'Eh chutaient sous +100 mV. Avec cette dissolution, les concentrations de Fe, As et Mo augmentaient dans la phase aqueuse. Les concentrations aqueuses d'As ont augmenté de 0, 87µg L −1 à 119µg L −1 durant la période de réduction de 48 jours. Le molybdate (MoO 2− 4 ), un anion polyatomique contenant de l'oxygène et similaire à l'arséniate, suivait également de très près la libération de Fe et de As en solution durant l'incubation. Les résultats indiquent que l'As et le Mo se comportent de même manière en réponse à la dissolution des oxydes de fer dans le sol sous des conditions de réduction et que leurs concentrations en phase aqueuse sont grandement contrôlées par la dissolution et la désorption de l'hôte d'oxyde de fer.

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Section: Resultssupporting

confidence: 67%

Release of arsenic and molybdenum by reductive dissolution of iron oxides in a soil with enriched levels of native arsenic

Bennett¹,

Dudas²

2003

Journal of Environmental Engineering and Science

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“…These results may be related to the high As concentrations in bioavailable fractions in the Can Gio mangrove sediments (Table SD2). In Vietnam, soils are naturally rich in As (Gustafsson andTin 1994, Nguyen et al 2016), which may explain its accumulation in mangrove sediments and then its transfer to mangrove roots. We suggest that As may be incorporated into iron plaque at the roots surface, which restricted As transfer to aerial parts.…”

Section: Non-essential Elements: Co Ni Cr Asmentioning

confidence: 99%

Bioaccumulation of some trace elements in tropical mangrove plants and snails (Can Gio, Vietnam)

Thanh‐Nho

Marchand

Strady

et al. 2019

Environmental Pollution

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Mangrove sediments can store high amount of pollutants that can be more or less bioavailable depending on environmental conditions. When in available forms, these elements can be subject to an uptake by mangrove biota, and can thus become a problem for human health. The main objective of this study was to assess the distribution of some trace elements (Fe, Mn, Co, Ni, Cr, As, and Cu) in tissues of different plants and snails in a tropical mangrove (Can Gio mangrove Biosphere Reserve) developing downstream a megacity (Ho Chi Minh City, Vietnam). In addition, we were interested in the relationships between mangrove habitats, sediment quality and bioaccumulation in the different tissues studied. Roots and leaves of main mangrove trees (Avicennia alba and Rhizophora apiculate) were collected, as well as different snail species: Chicoreus capucinus, Littoraria melanostoma, Cerithidea obtusa, Nerita articulata. Trace elements concentrations in the different tissues were determined by ICP-MS after digestion with concentrated HNO3 and H2O2. Concentrations differed between stands and tissues, showing the influence of sediment geochemistry, species specific requirements, and eventually adaptation abilities. Regarding plants tissues, the formation of iron plaque on roots may play a key role in preventing Fe and As translocation to the aerial parts of the mangrove trees. Mn presented higher concentrations in the leaves than in the roots, possibly because of physiological requirements. Nonessential elements (Ni, Cr and Co) showed low bioconcentration factors (BCF) in both roots and leaves, probably resulting from their low bioavailability in sediments. Regarding snails, essential elements (Fe, Mn, and Cu) were the dominant ones in their tissues. Most of snails were "macroconcentrators" for Cu, with BCF values reaching up to 42.8 for Cerithidea. We suggest that high quantity of As in all snails may result from its high bioavailability and from their ability to metabolize As.

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“…In the pyrite structure, As can readily substitute for Sand accumulate in the mineral as a trace or minor constituent. Recently, Gustafsson and Tin (1994) also found As content between 6-41 mg As kg-in acid sulfate soils in Mekong delta, Vietnam. Scanning Electron Microscope (SEM) study indicated that the organic matter remnants were roots of mangrove tree.…”

Section: Resultsmentioning

confidence: 91%

Release of metals during oxidation of pyrite from marine sediments in Malaysia

Muhrizal¹,

Shamshuddin²,

Fauziah³

et al. 1999

BGSM

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Pyrite, FeS" extensively accumulates under saline and brackish-water tidal swamp and marsh. Pyrite is stable-under waterlogged (reduced) condition. When drainage brings oxygen into this environment, the pyrite is oxidized releasing sulfuric acid. A study was conducted to determine the release of metals when pyritic sediment was oxidized or exposed to the atmospheric conditions. The pyrite content of sediments was 1.67% and 2.58%, respectively, from Sitiawan and Kuala Linggi. The total Fe and Al of both sediments were very high. Zn and Mo contents in sediments from Kuala Linggi were above the accepted level in soils and sediments (Alloway, 1990). Other metals were in normal range found elsewhere in soils and sediments. Large amounts of metals especially Fe and Al were present in the water soluble form indicating that exposing the sediments rich in pyrite to the atmosphere would release Fe and Al into the environment.

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Arsenic and selenium in some Vietnamese acid sulphate soils

Cited by 25 publications

References 9 publications

Release of arsenic and molybdenum by reductive dissolution of iron oxides in a soil with enriched levels of native arsenic

Release of arsenic and molybdenum by reductive dissolution of iron oxides in a soil with enriched levels of native arsenic

Bioaccumulation of some trace elements in tropical mangrove plants and snails (Can Gio, Vietnam)

Release of metals during oxidation of pyrite from marine sediments in Malaysia

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