PMID- 12537440
OWN - NLM
STAT- MEDLINE
DCOM- 20030312
LR  - 20171116
IS  - 0021-8561 (Print)
IS  - 0021-8561 (Linking)
VI  - 51
IP  - 3
DP  - 2003 Jan 29
TI  - Accelerated degradation of methyl iodide by agrochemicals.
PG  - 673-9
AB  - The fumigant methyl iodide (MeI, iodomethane) is considered a promising 
      alternative to methyl bromide (MeBr) for soil-borne pest control in 
      high-cash-value crops. However, the high vapor pressure of MeI results in 
      emissions of a significant proportion of the applied mass into the ambient air, 
      and this may lead to pollution of the environment. Integrating the application of 
      certain agrochemicals with soil fumigation provides a novel approach to reduce 
      excessive fumigant emissions. This study investigated the potential for several 
      agrochemicals that are commonly used in farming operations, including fertilizers 
      and nitrification inhibitors, to transform MeI in aqueous solution. The 
      pseudo-first-order hydrolysis half-life (t(1/2)) of MeI was approximately 108 d, 
      while the transformation of MeI in aqueous solutions containing selected 
      agrochemicals was more rapid, with t(1/2) < 100 d (t(1/2) < 0.5 d in some 
      solutions containing nitrification inhibitors). The influence of these 
      agrochemicals on the rate of MeI degradation in soil was also determined. 
      Adsorption to soil apparently reduced the availability of some nitrification 
      inhibitors in the soil aqueous phase and lowered the degradation rate in soil. In 
      contrast, addition of the nitrification inhibitors thiourea and allylthiourea to 
      soil significantly accelerated the degradation of MeI, possibly due to soil 
      surface catalysis. The t(1/2) of MeI was <20 h in thiourea- and 
      allylthiourea-amended soil, considerably less than that in unamended soil (t(1/2) 
      > 300 h).
FAU - Zheng, Wei
AU  - Zheng W
AD  - George E. Brown Jr. Salinity Laboratory, Soil Physics and Pesticide Research 
      Unit, USDA-ARS, 450 West Big Springs Road, Riverside, California 92507, USA.
FAU - Papiernik, Sharon K
AU  - Papiernik SK
FAU - Guo, Mingxin
AU  - Guo M
FAU - Yates, Scott R
AU  - Yates SR
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Agric Food Chem
JT  - Journal of agricultural and food chemistry
JID - 0374755
RN  - 0 (Agrochemicals)
RN  - 0 (Fertilizers)
RN  - 0 (Hydrocarbons, Iodinated)
RN  - 0 (Soil)
RN  - 0 (Solutions)
RN  - 059QF0KO0R (Water)
RN  - DAT010ZJSR (methyl iodide)
SB  - IM
MH  - Adsorption
MH  - Agriculture
MH  - Agrochemicals/administration & dosage/*chemistry
MH  - Fertilizers
MH  - Fumigation
MH  - Hydrocarbons, Iodinated/*chemistry
MH  - Hydrolysis
MH  - Kinetics
MH  - Soil/analysis
MH  - Solutions
MH  - Water
EDAT- 2003/01/23 04:00
MHDA- 2003/03/13 04:00
CRDT- 2003/01/23 04:00
PHST- 2003/01/23 04:00 [pubmed]
PHST- 2003/03/13 04:00 [medline]
PHST- 2003/01/23 04:00 [entrez]
AID - 10.1021/jf020820q [doi]
PST - ppublish
SO  - J Agric Food Chem. 2003 Jan 29;51(3):673-9. doi: 10.1021/jf020820q.