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Title: Experimental Determination of the Dissolution Kinetics of Zero-Valent Iron in the Presence of Organic Complexants

Abstract

Single-pass flow-through tests were conducted under conditions of relatively constant dissolved O2 [O2 (aq)] over the pH(23°C) range (from 7 to 12) and temperature (23° to 90°C) in the presence of EDTA and EDDHA to maintain dilute conditions and minimize the formation of a partially oxidized surface film and Fe-bearing secondary phase(s) during testing. These results indicate that the corrosion of Fe(0) is relatively insensitive to pH and temperature and the forward rate is 3 to 4 orders of magnitude higher than when a passive film and corrosion products are present. Tests conducted with Amasteel (a low carbon steel) and 99Tc-bearing Fe(0) metal indicated that the forward dissolution rates for both metals were similar, if not identical. In other words, under these test conditions the presence of P and 99Tc in the 99Tc-bearing Fe(0) metal appeared to have little effect on the forward dissolution rate and subsequent release of 99Tc.

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
915700
Report Number(s):
PNNL-SA-51341
830403000; TRN: US200816%%164
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Environmental Chemistry, 4(4):260-270
Additional Journal Information:
Journal Volume: 4; Journal Issue: 4
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON STEELS; CORROSION; CORROSION PRODUCTS; DISSOLUTION; EDTA; IRON; KINETICS; TESTING; Corrosion; zero-valent iron; dissolution kinetics

Citation Formats

Pierce, Eric M., Wellman, Dawn M., Lodge, Alex M., and Rodriguez, Elsa A. Experimental Determination of the Dissolution Kinetics of Zero-Valent Iron in the Presence of Organic Complexants. United States: N. p., 2007. Web. doi:10.1071/EN07004.
Pierce, Eric M., Wellman, Dawn M., Lodge, Alex M., & Rodriguez, Elsa A. Experimental Determination of the Dissolution Kinetics of Zero-Valent Iron in the Presence of Organic Complexants. United States. doi:10.1071/EN07004.
Pierce, Eric M., Wellman, Dawn M., Lodge, Alex M., and Rodriguez, Elsa A. Fri . "Experimental Determination of the Dissolution Kinetics of Zero-Valent Iron in the Presence of Organic Complexants". United States. doi:10.1071/EN07004.
@article{osti_915700,
title = {Experimental Determination of the Dissolution Kinetics of Zero-Valent Iron in the Presence of Organic Complexants},
author = {Pierce, Eric M. and Wellman, Dawn M. and Lodge, Alex M. and Rodriguez, Elsa A.},
abstractNote = {Single-pass flow-through tests were conducted under conditions of relatively constant dissolved O2 [O2 (aq)] over the pH(23°C) range (from 7 to 12) and temperature (23° to 90°C) in the presence of EDTA and EDDHA to maintain dilute conditions and minimize the formation of a partially oxidized surface film and Fe-bearing secondary phase(s) during testing. These results indicate that the corrosion of Fe(0) is relatively insensitive to pH and temperature and the forward rate is 3 to 4 orders of magnitude higher than when a passive film and corrosion products are present. Tests conducted with Amasteel (a low carbon steel) and 99Tc-bearing Fe(0) metal indicated that the forward dissolution rates for both metals were similar, if not identical. In other words, under these test conditions the presence of P and 99Tc in the 99Tc-bearing Fe(0) metal appeared to have little effect on the forward dissolution rate and subsequent release of 99Tc.},
doi = {10.1071/EN07004},
journal = {Environmental Chemistry, 4(4):260-270},
number = 4,
volume = 4,
place = {United States},
year = {2007},
month = {8}
}