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Extraction of arsenic from soils contaminated with wood preservation chemicals
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0001-7585-4017
KTH-International Groundwater Arsenic Research Group, Department of Land and Water Resources Engineering, Royal Institute of Technology (KTH),.
2010 (engelsk)Inngår i: Soil & sediment contamination, ISSN 1532-0383, E-ISSN 1549-7887, Vol. 19, nr 2, s. 142-159Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Three soil samples contaminated by chromated zinc arsenate (CZA) or chromated copper arsenate (CCA) were investigated in a laboratory scale to study As mobilization and to identify a chemical agent that could be used in soil washing to extract arsenic. Besides high As extraction, the cost, occupational health issues and technical aspects were considered when selecting the chemical. Arsenic is strongly bound to CZA/CCA soils; only ∼50% of the tot-As was removed from water-washed soils. High Fe or Al mobilization is not necessarily indicative of high As removal from CZA/CCA soils. A high Cu/As-ratio and a large amount of soluble Ca in the soil hampered As extraction. The high ratio can be an indication of stable Cu-arsenates in soil. Calcium can react with the extraction agent or with As during extraction. Sodium hydroxide, dithionite with citrate (and oxalate) (dithionite solutions), and oxalate with citrate were the most efficient chemicals for removing As from the soils. The disadvantages of using these strong chemicals are: a high cost (oxalate with citrate); damage to equipment (dithionite solutions); an adverse impact on occupational health (dithionite solutions); or a deterioration in soil quality after extraction (NaOH and dithionite solutons). Phosphate, solutions based on NH2OH·HCl, or citrate were not efficient in mobilizing As from the soils.

sted, utgiver, år, opplag, sider
2010. Vol. 19, nr 2, s. 142-159
Emneord [en]
Arsenic, Extraction, CCA, Contaminated soil, Soil washing, Other technology - Environmental engineering
Emneord [sv]
Arsenik, Extraktion, CCA, Förorenad jord, Jordtvätt, Övriga teknikvetenskaper - Miljöteknik
HSV kategori
Forskningsprogram
Tillämpad geologi; VA-teknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-12572DOI: 10.1080/15320380903390539ISI: 000276430500002Scopus ID: 2-s2.0-77951146414Lokal ID: bbc66ec0-319b-11df-806d-000ea68e967bOAI: oai:DiVA.org:ltu-12572DiVA, id: diva2:985523
Prosjekter
Pilotskale utvärdering av jordtvätt för sanering av arsenik-kontaminerad jord
Merknad
Validerad; 2010; 20100317 (learas)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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Amofah, Lea RastasMaurice, Christian

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