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Fractionation of heavy metals in liquefied chromated copper arsenate 9-treated wood sludge using a modified BCR-sequential extraction procedure
- Source :
- Chemosphere. 77:201-206
- Publication Year :
- 2009
- Publisher :
- Elsevier BV, 2009.
-
Abstract
- Chromated copper arsenate (CCA)-treated wood was liquefied with polyethylene glycol/glycerin and sulfuric acid. After liquefaction, most CCA metals (98% As, 92% Cr, and 83% Cu) were removed from liquefied CCA-treated wood by precipitation with calcium hydroxide. The original CCA-treated wood and liquefied CCA-treated wood sludge were fractionated by a modified Community Bureau of Reference (BCR) sequential extraction procedure. The purpose of the BCR-sequential extraction used in this study was to examine the availability of CCA metals in treated wood for reuse. Both As and Cr had a slightly higher concentration in the sludge sample than in original CCA-treated wood. The sequential extraction showed that As and Cr were principally existed in an oxidizable fraction (As, 67%; Cr, 88%) in original CCA-treated wood. Only 1% of both As and Cr were extracted by hot nitric acid with the last extraction step. The distribution of As and Cr changed markedly in liquefied CCA-treated wood sludge. The amount of As in the exchangeable/acid extractable fraction increased from 16% to 85% while the amount of Cr increased from 3% to 54%. Only about 3% of As was present in the oxidizable fraction. However, there was still about 34% of Cr in the same fraction. Based on these results from sequential extraction procedures, it can be concluded that the accessibilities of CCA metals increase markedly by the liquefaction-precipitation process.
- Subjects :
- Environmental Engineering
Health, Toxicology and Mutagenesis
information science
Fraction (chemistry)
Fractionation
Catalysis
Polyethylene Glycols
Calcium Hydroxide
chemistry.chemical_compound
Nitric acid
Metals, Heavy
parasitic diseases
Environmental Chemistry
cardiovascular diseases
Chromated copper arsenate
Environmental Restoration and Remediation
Calcium hydroxide
Sewage
Chemistry
fungi
Metallurgy
Extraction (chemistry)
Public Health, Environmental and Occupational Health
Liquefaction
Sulfuric acid
General Medicine
General Chemistry
Sulfuric Acids
Pulp and paper industry
Pollution
cardiovascular system
Arsenates
Subjects
Details
- ISSN :
- 00456535
- Volume :
- 77
- Database :
- OpenAIRE
- Journal :
- Chemosphere
- Accession number :
- edsair.doi.dedup.....f65ae5324cc9cfa74e2b855994578ddb
- Full Text :
- https://doi.org/10.1016/j.chemosphere.2009.07.037