Toxicity characteristic leaching procedure fails to extract oxoanion-forming elements that are extracted by municipal solid waste leachates

Citation
K. Hooper et al., Toxicity characteristic leaching procedure fails to extract oxoanion-forming elements that are extracted by municipal solid waste leachates, ENV SCI TEC, 32(23), 1998, pp. 3825-3830
Citations number
8
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology,"Environmental Engineering & Energy
Journal title
ENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN journal
0013-936X → ACNP
Volume
32
Issue
23
Year of publication
1998
Pages
3825 - 3830
Database
ISI
SICI code
0013-936X(199812)32:23<3825:TCLPFT>2.0.ZU;2-Z
Abstract
U.S. EPA and state regulatory agencies rely on standard extraction tests to identify wastes that have the potential to contaminate surface water or gr oundwater. To evaluate the predictive abilities of these extraction tests, the Toxicity Characteristic Leaching Procedure (TCLP), the Waste Extraction Test (WET), and the Synthetic Precipitation Leaching Procedure (SPLP) were compared with actual municipal solid waste leachates (MSWLs) for their abi lity to extract regulated elements from a variety of industrial solid waste s in short- and long-term extractions. Shortterm (18 and 48 h) extractions used MSWLs from a variety of California landfills. Long-term sequential ext ractions (48-84 days) simulated longer term leaching, as might occur in MSW landfills. For most regulated elements, the TCLP roughly predicted the max imum concentrations extracted : by the MSWLs. For regulated elements that f orm oxoanions (e.g., Sb, As, Mo, Se, V), however the TCLP underpredicted th e levels extracted by the MSWL. None of the standard tests adequately predi cted these levels. The results emphasize the need for better standardized t echniques to identify wastes that have the potential to contaminate groundw ater with oxoanion-forming elements, particularly arsenic.