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Extraction of Arsenic from Soils Contaminated with Wood Preservation Chemicals
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering. (KTH-International Groundwater Arsenic Research Group (GARG))ORCID iD: 0000-0003-4350-9950
2010 (English)In: Soil & sediment contamination, ISSN 1532-0383, Vol. 19, no 2, 142-159 p.Article in journal (Refereed) 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 similar to 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 center dot HCl, or citrate were not efficient in mobilizing As from the soils.

Place, publisher, year, edition, pages
2010. Vol. 19, no 2, 142-159 p.
Keyword [en]
arsenic, CCA, contaminated soil, extraction, soil washing
National Category
Other Environmental Engineering
URN: urn:nbn:se:kth:diva-28302DOI: 10.1080/15320380903390539ISI: 000276430500002ScopusID: 2-s2.0-77951146414OAI: diva2:386781
QC 20110113Available from: 2011-01-13 Created: 2011-01-12 Last updated: 2011-01-13Bibliographically approved

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Bhattacharya, Prosun
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