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Extraction of arsen...
Extraction of arsenic from soils contaminated with wood preservation chemicals
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- Amofah, Lea Rastas (författare)
- Luleå tekniska universitet,Arkitektur och vatten
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- Maurice, Christian (författare)
- Luleå tekniska universitet,Geovetenskap och miljöteknik
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- Bhattacharya, Prosun (författare)
- KTH,Mark- och vattenteknik,Department of Land and Water Resources Engineering , Royal Institute of Technology (KTH) , Stockholm, Sweden,KTH-International Groundwater Arsenic Research Group
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(creator_code:org_t)
- 2010-03-16
- 2010
- Engelska.
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Ingår i: Soil & sediment contamination. - : Informa UK Limited. - 1532-0383 .- 1549-7887. ; 19:2, s. 142-159
- Relaterad länk:
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https://urn.kb.se/re...
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visa fler...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Samhällsbyggnadsteknik -- Vattenteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Civil Engineering -- Water Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Naturresursteknik -- Annan naturresursteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Engineering -- Other Environmental Engineering (hsv//eng)
Nyckelord
- Arsenic
- Extraction
- CCA
- Contaminated soil
- Soil washing
- Arsenik
- Extraktion
- CCA
- Förorenad jord
- Jordtvätt
- Applied Geology
- Tillämpad geologi
- VA-teknik
- Urban Water Engineering
- Environmental engineering
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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