Structural Fumigants, The Residue Potential of Sulfuryl Fluoride, Methyl Bromide, and Methanesulfonyl Fluoride in Structural Fumigations

1962 ◽  
Vol 10 (5) ◽  
pp. 393-397 ◽  
Author(s):  
R. W. Meikle ◽  
Doane Stewart
Keyword(s):  
Methyl Bromide ◽  
Sulfuryl Fluoride

Survival of the Oak Wilt Fungus in Logs Fumigated with Sulfuryl Fluoride and Methyl Bromide

2019 ◽  
Vol 69 (1) ◽  
pp. 87-95
Author(s):  
Anna Yang ◽  
Kendhl Seabright ◽  
Jennifer Juzwik ◽  
Scott W. Myers ◽  
Adam Taylor
Keyword(s):  
Methyl Bromide ◽  
Slow Variable ◽  
Current Treatment ◽  
Treatment Schedule ◽  
Level Control ◽  
Oak Wilt ◽  
Sulfuryl Fluoride ◽  
Concentration Time ◽  
Pathogen Colonization ◽  
And Diffusion

Abstract Methyl bromide (MB) fumigation of oak (Quercus sp.) logs destined for export is required to mitigate risks associated with movement of the oak wilt fungus, Bretziella fagacearum. Alternative fumigants with efficacy against B. fagacearum are needed because of MB's ozone-depleting properties. Fumigation with sulfuryl fluoride (SF) is considered a promising substitute. Logs (1.8 m long) were obtained from Quercus trees (18.3 to 29.2 cm diameter at breast height) that were naturally infested (NI) or artificially inoculated (AI) with B. fagacearum to compare pathogen colonization and survival following fumigation with SF and MB. The logs were fumigated with SF for 72 hours with 240, 280, and 320 g/m3 or 96 hours with 128 and 240 g/m3. MB fumigations were conducted using the current treatment schedule for oak logs destined for export (240 g/m3 for 72 h). Frequencies of successful pathogen isolation before treatment were higher for AI logs than for NI logs based on isolation rates from sapwood chips. Treatments greatly reduced frequencies of viable pathogen presence, but no treatment was successful in eradicating the pathogen. Experiments were conducted on blocks (10.2 by 10.2 by 11.4 cm3) obtained from Quercus trees to investigate simulated penetration and diffusion of SF and MB into oak logs. Slow, variable fumigant diffusion never reached concentration–time products lethal to B. fagacearum. Based on these results, reliance on SF alone as a quarantine measure may require higher concentration × time products to achieve quarantine level control of the oak wilt fungus in logs.

Optimization and Validation of HS-SPME-GCMS Method for Determination of Multifumigant Residues in Grain, Oilseeds, Nuts, and Dry Fruit

2019 ◽  
Vol 102 (6) ◽  
pp. 1877-1883 ◽  
Author(s):  
Xin Du ◽  
Wenjuan Zhang ◽  
Bo Liu ◽  
Tao Liu ◽  
Yu Xiao ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Propylene Oxide ◽  
Methyl Bromide ◽  
Ethyl Formate ◽  
Ethyl Bromide ◽  
Gas Chromatograph ◽  
Sulfuryl Fluoride ◽  
Dried Fruit ◽  
Food Matrices

Abstract Background: Fumigants are approved in many countries and used to treat food, feed, and seed. The amount of residue that remains in fumigated materials is measured and reported. Objective: The optimization and validation of a high-sensitivity headspace solid-phase microextraction gas chromatograph mass spectrometer (HS-SPME-GCMS) method for determination of eight fumigant residues—phosphine, methyl bromide, cyanogen, sulfuryl fluoride, ethylene oxide, propylene oxide, ethyl bromide and ethyl formate—in a range of food matrices were developed. The food matrices included grain, oilseed, dried fruit, and nut. Methods: The new method was used to determine residue levels from a fumigant complex in food matrices by monitoring the change of the absorption of spiked standards and desorption of fumigant from fumigated samples. Results: Based on the observation, the process of physical sorption and chemisorption was defined. The equilibrium time of the sample analysis was chosen at 5 hours. The LODs of the fumigants were in the range of 0.03 to 1.99 ng/g. Response to a range of diluted authentic standards gave significant linear regressions (r2 > 0.9983), and the RSDs were ≤8.7% at the 3 ng/g level of aged spiking standard, except for sulfuryl fluoride, for which the LOD was 1.99 ng/g and the RSD value was 39.7% (6.64 ng/g). Conclusions: The performance of the HS-SPME-GCMS method was more sensitive than the use of a gas syringe, except for sulfuryl fluoride. Highlights: An innovative multifumigant residue detection method based on HS-SPME sampling technology with gas chromatograph-mass selective detection (GC-MSD) analysis was established, including phosphine, methyl bromide, cyanogen, sulfuryl fluoride, ethylene oxide, propylene oxide, ethyl bromide, and ethyl formate; The first report of a sorption study of the process of physical sorption and chemisorption of residual fumigant in fruit and food matrices by an HS-SPME-GCMS method; Consider the effect of time on fumigant behavior in dried fruit, grain, and nut; The LODs of the fumigants were in the range of 0.03 to 1.99 ng/g.

scholarly journals Use of sulfuryl fluoride as an alternative fumigant to methyl bromide in export log fumigation

2006 ◽  
Vol 59 ◽  
pp. 223-227 ◽  
Author(s):  
Z. Zhang
Keyword(s):  
Methyl Bromide ◽  
Concentration Level ◽  
Promising Alternative ◽  
Sulfuryl Fluoride ◽  
Full Control ◽  
Total Control ◽  
Hylastes Ater

As the deadline for phasing out the use of methyl bromide as a fumigant approaches alternative fumigants are being evaluated Sulfuryl fluoride has emerged as a promising alternative and is gaining increasing acceptance in Europe This study showed that sulfuryl fluoride was an effective fumigant for the control of Arhopalus tristis adults at the lowest concentration tested (15 g/m3) while 120 g/m3 was required for full control of A tristis eggs Sulfuryl fluoride also gave total control of Hylastes ater adults and larvae at 15 g/m3 Sulfuryl fluoride showed potential to control the eight fungi tested in this study with a concentration level of at least 30 g/m3 required for full control of the eight fungi tested

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