Evaluating the Mobility of Arsenic in Synthetic Iron-Containing Solids Using a Modified Sequential Extraction Method
Publication: Journal of Environmental Engineering
Volume 136, Issue 2
Abstract
Many water treatment technologies for arsenic removal that are used today produce arsenic-bearing residuals which are disposed in nonhazardous landfills. Previous works have established that many of these residuals will release arsenic to a much greater extent than predicted by standard regulatory leaching tests (e.g., the toxicity characteristic leaching procedure) and, consequently, require stabilization to ensure benign behavior after disposal. In this work, a four-step sequential extraction method was developed in an effort to determine the proportion of arsenic in various phases in untreated as well as stabilized iron-based solid matrices. The solids synthesized using various potential stabilization techniques included: amorphous arsenic-iron sludge (ASL), reduced ASL via reaction with zero valent iron (RASL), amorphous ferrous arsenate (PFA), a mixture of PFA and SL (M1), crystalline ferrous arsenate (HPFA), and a mixture of HPFA and SL (M2). The overall arsenic mobility of the tested samples increased in the following order: .
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Acknowledgments
This work was supported by the National Institute of Environmental Health Sciences (NIEHS) Grant No. UNSPECIFIEDP42 ES04940. This paper’s contents are solely the responsibility of the writers and do not necessarily represent the official views of NIEHS. The writers want to thank the Arizona Department of Health for providing arsenic analysis on their ICP-OES instrument and Dr. Robert Downs and his research group in the University of Arizona, Geosciences Department for their help in arsenic mineral identification.
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© 2010 ASCE.
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Received: Jan 6, 2009
Accepted: Aug 12, 2009
Published online: Aug 15, 2009
Published in print: Feb 2010
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