TY - JOUR
T1 - Degradation of disinfection byproducts by carbonate green rust
AU - Chun, Chan Lan
AU - Hozalski, Raymond M.
AU - Arnold, William A.
PY - 2007/3/1
Y1 - 2007/3/1
N2 - Disinfection byproducts (DBPs) in drinking water flowing through corroded iron or steel pipes may encounter carbonate green rust (GR(CO3 2-)), a mixed Fe(II)/Fe(III) hydroxide mineral and potent reductant. This research was performed to investigate the kinetics and pathways of the degradation of selected halogenated DBFs in the presence of GR(CO 32-). Trichloronitromethane was rapidly degraded to methylamine via sequential hydrogenolysisfollowed by nitroreduction. Haloacetic acids reacted solely via sequential hydrogenolysis. Trichloroacetonitrile, 1,1,1-trichloropropanone, and trichloroacetaldehyde hydrate were transformed via hydrolysis and hydrogenolysis. Chloroform was unreactive over 300 h. The buffer identity affected reductive dehalogenation rates of DBPs, with faster rates in MOPS buffer than in carbonate buffer, the latter being representative of the buffer in drinking water systems. GR(CO32-) was unstable in both buffers and transformed to magnetite within 48 h. Thus, slower reacting compounds (half life >3 hours) were transformed by a combination of minerals. Reductive dehalogenation kinetics were influenced by DBP chemical structure and correlated with one-electron reduction potential.
AB - Disinfection byproducts (DBPs) in drinking water flowing through corroded iron or steel pipes may encounter carbonate green rust (GR(CO3 2-)), a mixed Fe(II)/Fe(III) hydroxide mineral and potent reductant. This research was performed to investigate the kinetics and pathways of the degradation of selected halogenated DBFs in the presence of GR(CO 32-). Trichloronitromethane was rapidly degraded to methylamine via sequential hydrogenolysisfollowed by nitroreduction. Haloacetic acids reacted solely via sequential hydrogenolysis. Trichloroacetonitrile, 1,1,1-trichloropropanone, and trichloroacetaldehyde hydrate were transformed via hydrolysis and hydrogenolysis. Chloroform was unreactive over 300 h. The buffer identity affected reductive dehalogenation rates of DBPs, with faster rates in MOPS buffer than in carbonate buffer, the latter being representative of the buffer in drinking water systems. GR(CO32-) was unstable in both buffers and transformed to magnetite within 48 h. Thus, slower reacting compounds (half life >3 hours) were transformed by a combination of minerals. Reductive dehalogenation kinetics were influenced by DBP chemical structure and correlated with one-electron reduction potential.
UR - http://www.scopus.com/inward/record.url?scp=33847630742&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33847630742&partnerID=8YFLogxK
U2 - 10.1021/es061571f
DO - 10.1021/es061571f
M3 - Article
C2 - 17396650
AN - SCOPUS:33847630742
SN - 0013-936X
VL - 41
SP - 1615
EP - 1621
JO - Environmental Science and Technology
JF - Environmental Science and Technology
IS - 5
ER -