Distribution and mobility of arsenic in the Rio Dulce alluvial aquifers in Santiago del Estero Province, Argentina

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MARC

Bhattacharya, ProsunKTH,Mark- och vattenteknik (author)

Distribution and mobility of arsenic in the Rio Dulce alluvial aquifers in Santiago del Estero Province, Argentina

Article/chapterEnglish2006

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Elsevier BV,2006
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LIBRIS-ID:oai:DiVA.org:kth-37342
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-37342URI
https://doi.org/10.1016/j.scitotenv.2005.04.048DOI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

Notes

Factors controlling arsenic (As) mobilization in the aquifers of the Rio Dulce alluvial cone were investigated. Groundwater analyses show severe As contamination (average concentration of 743 mu g/L) from geogenic sources, but spatial variability of As concentration is considerable. Sequential leaching of sediment samples from unsaturated zone using de-ionised water, bicarbonate, acetate, and oxalate extracted As to different extents. Sediment oxalate extraction showed that Al and Mn oxide and hydroxides are more abundant than Fe oxides and hydroxides, in spite of similar total Fe, Mn, and Al concentrations in the sediment. Speciation calculations performed for saturated zone samples indicated that Fe and Al oxides and hydroxides are stable in groundwater, suggesting that As adsorption processes may be to some extent controlled by the presence of Fe and Al mineral phases. Principal Component Analysis (PCA) showed that As is related to F, V, Mo, B, Si, most likely due to their common origin in volcanic ash. This suggests the volcanic ash as the probable source of groundwater As. Locally, elevated pH values linked to carbonate dissolution, cation exchange, and dissolution of silicates promote release of adsorbed As. Another factor contributing to the release of As locally may be the input of organic matter from excessive irrigation. The conceptual model of As release includes: i) As influx from dissolution of volcanic glass in volcanic ash, ii) adsorption of As on the surface of Fe and Al mineral phases in relatively low pH zones, and iii) high mobility of As in high pH zones. Future work should be focused on the determination of mineralogical forms of As in volcanic ash and on detailed investigation on factors controlling As mobility.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Samhällsbyggnadsteknik hsv//swe
ENGINEERING AND TECHNOLOGY Civil Engineering hsv//eng
arsenic
mobilization
Rio Dulce alluvial cone
Argentina
volcanic ash
sediments
adsorption
oxides
Civil engineering and architecture
Samhällsbyggnadsteknik och arkitektur

Added entries (persons, corporate bodies, meetings, titles ...)

Claesson, MattiasKTH,Mark- och vattenteknik(Swepub:kth)u1cc4gs3 (author)
Bundschuh, J. (author)
Sracek, O. (author)
Fagerberg, JensKTH,Mark- och vattenteknik(Swepub:kth)u1bcjb0v (author)
Jacks, GunnarKTH,Mark- och vattenteknik(Swepub:kth)u1sdhm2p (author)
Martin, R. A. (author)
Storniolo, A. D. (author)
Thir, J. M. (author)
KTHMark- och vattenteknik (creator_code:org_t)

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In:Science of the Total Environment: Elsevier BV358:1-3, s. 97-1200048-96971879-1026

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