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

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Fältnamn	Indikatorer	Metadata
000		03934naa a2200457 4500
001		oai:DiVA.org:kth-23122
003		SwePub
008		100810s2004 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231222 URI
024	7	a https://doi.org/10.1016/j.apgeochem.2003.09.0052 DOI
040		a (SwePub)kth
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Sracek, O.4 aut
245	1 0	a Behavior of arsenic and geochemical modeling of arsenic enrichment in aqueous environments
264	1	b Elsevier BV,c 2004
338		a print2 rdacarrier
500		a QC 20100525 QC 20111019
520		a 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.
650	7	a TEKNIK OCH TEKNOLOGIERx Samhällsbyggnadsteknik0 (SwePub)2012 hsv//swe
650	7	a ENGINEERING AND TECHNOLOGYx Civil Engineering0 (SwePub)2012 hsv//eng
653		a ground-water
653		a reactive transport
653		a united-states
653		a competitive adsorption
653		a west-bengal
653		a bangladesh
653		a phosphate
653		a aquifers
653		a surface
653		a acid
700	1	a Bhattacharya, Prosunu KTH,Mark- och vattenteknik4 aut0 (Swepub:kth)u19v7ore
700	1	a Jacks, Gunnaru KTH,Mark- och vattenteknik4 aut0 (Swepub:kth)u1sdhm2p
700	1	a Gustafsson, Jon Petteru KTH,Mark- och vattenteknik4 aut0 (Swepub:kth)u1ep3pgj
700	1	a von Brömssen, Mattiasu KTH,Mark- och vattenteknik4 aut0 (Swepub:kth)u1wdbqer
710	2	a KTHb Mark- och vattenteknik4 org
773	0	t Applied Geochemistryd : Elsevier BVg 19:2, s. 169-180q 19:2<169-180x 0883-2927x 1872-9134
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-23122
856	4 8	u https://doi.org/10.1016/j.apgeochem.2003.09.005

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