Behavior of arsenic and geochemical modeling of arsenic enrichment in aqueous environments

↓ Direkt till sidans innehåll
↓ Direkt till sidans sekundära innehåll (sidomenyn)

Search: onr:"swepub:oai:DiVA.org:kth-23122" > Behavior of arsenic...

1 of 1
Previous record
Next record
To hitlist

Details
MARC

Sracek, O. (author)

Behavior of arsenic and geochemical modeling of arsenic enrichment in aqueous environments

Article/chapterEnglish2004

Publisher, publication year, extent ...

Elsevier BV,2004
printrdacarrier

Numbers

LIBRIS-ID:oai:DiVA.org:kth-23122
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-23122URI
https://doi.org/10.1016/j.apgeochem.2003.09.005DOI

Supplementary language notes

Language:English
Summary in:English

Part of subdatabase

SwePubSwePub

Classification

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

Notes

QC 20100525 QC 20111019
Arsenic is present in aqueous environments in +III and +V oxidation states. In oxidizing environments, the principle attenuation mechanism of As migration is its adsorption on Fe(III) oxide and hydroxides. The adsorption affinity is higher for As(V) under lower pH conditions and for As(III) under higher pH conditions. Ferric oxide and hydroxides can dissolve under low Eh and pH conditions releasing adsorbed As. Oxidation-reduction processes often involve high organic matter content in sediments and also contamination by organics such as BTEX. Arsenic may desorb under high pH conditions. Changes of pH can be related to some redox reactions, cation exchange reactions driving dissolution of carbonates, and dissolution of silicates. In very reducing environments, where SO4 reduction takes place, secondary sulfide minerals like As-bearing pyrite and orpiment, As2S3, can incorporate As. Geochemical modeling can be divided into two principal categories: (a) forward modeling and (b) inverse modeling. Forward modeling is used to predict water chemistry after completion of predetermined reactions. Inverse modeling is used to suggest which processes take place along a flowpath. Complex coupled transport and geochemistry programs, which allow for simulation of As adsorption, are becoming available. A common modeling approach is based on forward modeling with surface complexation modeling (SCM) of As adsorption, which can incorporate the effect of different adsorbent/As ratios, adsorption sites density, area available for adsorption, pH changes and competition of As for adsorption sites with other dissolved species such as phosphate. The adsorption modeling can be performed in both batch and transport modes in codes such as PHREEQC. Inverse modeling is generally used to verify hypotheses on the origin of As. Basic prerequisites of inverse modeling are the knowledge of flow pattern (sampling points used in model have to be hydraulically connected) and information about mineralogy including As mineral phases. Case studies of geochemical modeling including modeling of As adsorption are presented.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Samhällsbyggnadsteknik hsv//swe
ENGINEERING AND TECHNOLOGY Civil Engineering hsv//eng
ground-water
reactive transport
united-states
competitive adsorption
west-bengal
bangladesh
phosphate
aquifers
surface
acid

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

Bhattacharya, ProsunKTH,Mark- och vattenteknik(Swepub:kth)u19v7ore (author)
Jacks, GunnarKTH,Mark- och vattenteknik(Swepub:kth)u1sdhm2p (author)
Gustafsson, Jon PetterKTH,Mark- och vattenteknik(Swepub:kth)u1ep3pgj (author)
von Brömssen, MattiasKTH,Mark- och vattenteknik(Swepub:kth)u1wdbqer (author)
KTHMark- och vattenteknik (creator_code:org_t)

Related titles

In:Applied Geochemistry: Elsevier BV19:2, s. 169-1800883-29271872-9134

Internet link

Find in a library

Applied Geochemistry (Search for host publication in LIBRIS)

To the university's database

1 of 1
Previous record
Next record
To hitlist

Find more in SwePub

By the author/editor: Sracek, O.; Bhattacharya, Pr ...; Jacks, Gunnar; Gustafsson, Jon ...; von Brömssen, Ma ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Civil Engineerin ...

Articles in the publication: Applied Geochemi ...

By the university: Royal Institute of Technology

Search outside SwePub

Extend your search to:: Google; Google Book Search; Google Scholar

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

LIBRIS.kb.se