PMID- 19202021
OWN - NLM
STAT- MEDLINE
DCOM- 20090423
LR  - 20181201
IS  - 0047-2425 (Print)
IS  - 0047-2425 (Linking)
VI  - 38
IP  - 2
DP  - 2009 Mar-Apr
TI  - Degradation of methyl iodide in soil: effects of environmental factors.
PG  - 513-9
LID - 10.2134/jeq2008.0124 [doi]
AB  - Methyl iodide (MeI) is a promising alternative to the phased-out fumigant methyl 
      bromide (MeBr); however, there are concerns about its environmental fate 
      following soil fumigation. Laboratory experiments were conducted to investigate 
      the effect of various environmental factors on the rate of MeI degradation in 
      soil. The chemical was added to soil at 48.6 mg kg(-1) and incubated under 
      different conditions. The MeI degradation rate in soil was determined by 
      extracting and measuring residual concentrations over a 15 d incubation period. 
      In soil, MeI degradation followed availability-adjusted first-order kinetics. At 
      20 degrees C MeI had a calculated half-life of 32 d in a sandy loam containing 
      4.3 g kg(-1) of organic carbon. It degraded more rapidly as temperature 
      increased, exhibiting a half-life of 23 d at 30 degrees C. Amendment with 10% 
      cattle manure shortened the half-life to 4 d at 20 degrees C. In both unamended 
      and manure-amended soils, the half-life of MeI greatly increased as the organic 
      matter (OM) was removed and it only slightly increased in soils that were 
      sterilized, indicating predominance of chemical reactions in MeI degradation. 
      Soil texture, mineralogy, and moderate moisture content had little influence on 
      MeI degradation. The degradation slowed as the chemical application rate 
      increased. The results suggest that environmental factors, especially soil 
      temperature and organic amendments, should be considered in combination with the 
      minimum effective MeI application rate for achieving satisfactory pest-control 
      efficacy, reducing atmospheric volatilization, and minimizing groundwater 
      contamination.
FAU - Guo, Mingxin
AU  - Guo M
AD  - Dep. of Agriculture and Natural Resources, Delaware State Univ., Dover, DE 19901, 
      USA. mguo@desu.edu
FAU - Gao, Suduan
AU  - Gao S
LA  - eng
PT  - Journal Article
DEP - 20090206
PL  - United States
TA  - J Environ Qual
JT  - Journal of environmental quality
JID - 0330666
RN  - 0 (Aluminum Silicates)
RN  - 0 (Hydrocarbons, Iodinated)
RN  - 0 (Organic Chemicals)
RN  - 0 (Soil)
RN  - 059QF0KO0R (Water)
RN  - DAT010ZJSR (methyl iodide)
RN  - T1FAD4SS2M (Clay)
SB  - IM
MH  - Aluminum Silicates/chemistry
MH  - Clay
MH  - Fumigation
MH  - Hydrocarbons, Iodinated/analysis/*chemistry
MH  - Organic Chemicals/chemistry
MH  - Pest Control/methods
MH  - Soil/*analysis
MH  - Soil Microbiology
MH  - Temperature
MH  - Water/chemistry
EDAT- 2009/02/10 09:00
MHDA- 2009/04/25 09:00
CRDT- 2009/02/10 09:00
PHST- 2009/02/10 09:00 [entrez]
PHST- 2009/02/10 09:00 [pubmed]
PHST- 2009/04/25 09:00 [medline]
AID - 38/2/513 [pii]
AID - 10.2134/jeq2008.0124 [doi]
PST - epublish
SO  - J Environ Qual. 2009 Feb 6;38(2):513-9. doi: 10.2134/jeq2008.0124. Print 2009 
      Mar-Apr.