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Title: Arsenic Mobilization from Contaminated Sediments: A Full-scale Experiment in Progress

Abstract

The mobilization of arsenic was examined in a system where the deposition of iron and arsenic have been substantially modified by large-scale manipulations. This engineering practice was designed to decrease arsenic concentrations in water supplied to the City of Los Angeles. Accomplishing this objective, however, has resulted in significant accumulation of arsenic and iron in the sediments of a reservoir on the Los Angeles Aqueduct. Arsenic and iron are released into the porewater at depth in the sediment, consistent with reductive dissolution of iron(III) oxyhydroxides. Factors influencing the possible re-sorption of arsenic onto residual iron(III) oxyhydroxides solids have been examined. Reduction of As(V) to As(III) alone cannot account for arsenic mobilization since arsenic occurs in the solid phase as As(III) well above the depth at which it is released into the porewater. Competition from other porewater constituents could suppress re-sorption of arsenic released by reductive dissolution.

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
15013974
Report Number(s):
UCRL-CONF-202181
TRN: US200803%%888
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: Eleventh International Symposium on Water Rock Interaction (WRI), Saratoga Springs, NY, United States, Jun 27 - Jul 02, 2004
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; ARSENIC; DEPOSITION; DISSOLUTION; IRON; LOS ANGELES; SEDIMENTS; WATER

Citation Formats

O'Day, P A, Campbell, K, Dixit, S, and Hering, J G. Arsenic Mobilization from Contaminated Sediments: A Full-scale Experiment in Progress. United States: N. p., 2004. Web.
O'Day, P A, Campbell, K, Dixit, S, & Hering, J G. Arsenic Mobilization from Contaminated Sediments: A Full-scale Experiment in Progress. United States.
O'Day, P A, Campbell, K, Dixit, S, and Hering, J G. Tue . "Arsenic Mobilization from Contaminated Sediments: A Full-scale Experiment in Progress". United States. doi:. https://www.osti.gov/servlets/purl/15013974.
@article{osti_15013974,
title = {Arsenic Mobilization from Contaminated Sediments: A Full-scale Experiment in Progress},
author = {O'Day, P A and Campbell, K and Dixit, S and Hering, J G},
abstractNote = {The mobilization of arsenic was examined in a system where the deposition of iron and arsenic have been substantially modified by large-scale manipulations. This engineering practice was designed to decrease arsenic concentrations in water supplied to the City of Los Angeles. Accomplishing this objective, however, has resulted in significant accumulation of arsenic and iron in the sediments of a reservoir on the Los Angeles Aqueduct. Arsenic and iron are released into the porewater at depth in the sediment, consistent with reductive dissolution of iron(III) oxyhydroxides. Factors influencing the possible re-sorption of arsenic onto residual iron(III) oxyhydroxides solids have been examined. Reduction of As(V) to As(III) alone cannot account for arsenic mobilization since arsenic occurs in the solid phase as As(III) well above the depth at which it is released into the porewater. Competition from other porewater constituents could suppress re-sorption of arsenic released by reductive dissolution.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Feb 03 00:00:00 EST 2004},
month = {Tue Feb 03 00:00:00 EST 2004}
}

Conference:
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