PMID- 20705994
OWN - NLM
STAT- MEDLINE
DCOM- 20101026
LR  - 20131121
IS  - 0273-1223 (Print)
IS  - 0273-1223 (Linking)
VI  - 62
IP  - 3
DP  - 2010
TI  - Oxidative degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) in subcritical 
      and supercritical waters.
PG  - 484-90
LID - 10.2166/wst.2010.329 [doi]
AB  - Presence of chlorinated organic compounds in water bodies has become a concern 
      among governments, health authorities and general public. Oxidation of organic 
      compounds in water under high temperature and pressure is considered as a 
      promising technique, but usefulness of the technique to mineralize 
      2,4-dichlorophenoxyacetic acid (2,4-D) is not well understood. This article aimed 
      to elucidate degradation characteristics of 2,4-D in both subcritical and 
      supercritical waters by laboratory batch experiments. 2,4-D degradation, total 
      organic carbon (TOC) removal and dechlorination increased with increasing 
      reaction time and temperature especially in subcritical waters, while 
      dechlorination was a major step. 2,4-dichlorophenol (2,4-DCP) and acetic acid 
      were the main degradation intermediates both in subcritical and supercritical 
      waters. Though 2,4-D disappeared almost completely in subcritical waters near 
      critical region ( approximately 99%), significant amounts of TOC and organic 
      chlorine still remained as 2,4-DCP and acetic acid. But TOC removal and 
      dechlorination were significantly enhanced ( approximately 95 and 91% 
      respectively) in supercritical waters. Complete mineralization of 2,4-D in 
      subcritical waters required a considerably longer reaction period, while the 
      mineralization was almost complete within a short reaction period in 
      supercritical waters. This is an important information of practical significance 
      for oxidative degradation of chlorinated pesticides similar to 2,4-D.
FAU - Hashimoto, M
AU  - Hashimoto M
AD  - Graduate School of Engineering, Osaka Sangyo University, 3-1-1 Nakagaito, Daito 
      City, 574-8530 Osaka, Japan.
FAU - Taniguchi, S
AU  - Taniguchi S
FAU - Takanami, R
AU  - Takanami R
FAU - Giri, R R
AU  - Giri RR
FAU - Ozaki, H
AU  - Ozaki H
LA  - eng
PT  - Journal Article
PL  - England
TA  - Water Sci Technol
JT  - Water science and technology : a journal of the International Association on 
      Water Pollution Research
JID - 9879497
RN  - 0 (Herbicides)
RN  - 0 (Water Pollutants, Chemical)
RN  - 059QF0KO0R (Water)
RN  - 2577AQ9262 (2,4-Dichlorophenoxyacetic Acid)
SB  - IM
MH  - 2,4-Dichlorophenoxyacetic Acid/*chemistry
MH  - Herbicides/*chemistry
MH  - Oxidation-Reduction
MH  - Pressure
MH  - Temperature
MH  - Water/*chemistry
MH  - Water Pollutants, Chemical/*chemistry
MH  - Water Purification
EDAT- 2010/08/14 06:00
MHDA- 2010/10/27 06:00
CRDT- 2010/08/14 06:00
PHST- 2010/08/14 06:00 [entrez]
PHST- 2010/08/14 06:00 [pubmed]
PHST- 2010/10/27 06:00 [medline]
AID - 10.2166/wst.2010.329 [doi]
PST - ppublish
SO  - Water Sci Technol. 2010;62(3):484-90. doi: 10.2166/wst.2010.329.