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Dazomet
Dazomet
is a common soil fumigant that acts as a herbicide, fungicide, and nematicide.

Contents

1 Applications 2 Synthesis 3 Toxicology and safety 4 Mass Spectrum 5 Patents 6 References

Applications[edit] Dazomet
Dazomet
is a chemical used to kill pests that inhibit plant growth through gaseous degradation. Dazomet
Dazomet
is used as a soil sterilant on a variety of sites such as golf courses, nurseries, turf sites, and potting soils.[4] Dazomet
Dazomet
is used for soil sterilization as an alternative to methyl bromide. Although less effective it is still used to kill pests because of its comparatively lower toxicity. Dazomet
Dazomet
is applied to wet soil, which causes dazomet itself to decompose into a gaseous form, which is what actively controls pests. The decomposition of dazomet releases methyl isothiocyanate (MITC) a gas toxic to pests that would prevent or kill plant growth. Synthesis[edit] Dazomet
Dazomet
is synthesized from carbon disulfide (CS2) and diluted methylamine (CH3NH2). After stirring for 1-2 hours, an oily substance is formed, which is the intermediate methylcarbamodithioic acid (HS2CNHCH3). Then, formaldehyde (CH2O) is added to the intermediate to form the fine granule dazomet.[5] Toxicology and safety[edit] Dazomet
Dazomet
is irritating to the eyes[6] and its degradation product, MITC, is a dermal sensitizer. Dazomet
Dazomet
is very toxic to aquatic organisms, and also acutely toxic to mammals. Exposure to dazomet can occur through several means; interaction with unincorporated granules, inhalation of it decomposition product, MITC, and/or water runoff. Mass Spectrum[edit] The molecular ion peak of dazomet is at 162 m/z. There are two major fragment peaks, one at 89 m/z and one at 42 m/z. The fragment peak at 89 m/z represents the loss of MITC, which is the major, gaseous degrade of dazomet.[7] Patents[edit] Patent #US5989597 Ambrose Rajamannan was the inventor of the novel process of continuously and instantaneously sterilizing soil using a water-activated fumigant. Dazomet
Dazomet
is one water-activated fumigant that could be used. This process ensures 100% activation of the fumigant. Therefore, less fumigant would be needed to ensure that the soil would be completely sterilized.[8]

Patent #CN1543787 See under "Synthesis". References[edit]

^ SciFinder.Dazomet.properties (accessed Oct. 5, 2014). ^ SciFinder.Dazomet.properties (accessed Oct. 5, 2014). ^ "MSDS for Diazomet". Sigma-Aldrich.  ^ "RED Fact Sheet: Dazomet" (PDF). US Environmental Protection Agency, Office of Pesticide Programs. July 10, 2008. Archived from the original (PDF) on 2014-10-16.  ^ Cao, Y.; Lu, Y. Process for preparing dazomet dustless stable fine granules. CN1543787, Nov. 10, 2004. ^ "Dazomet". PAN Pesticides Database.  ^ NIST Chemistry WebBook. 2H-1,3,5-Thiadiazine-2-thione, tetrahydro-3,5-dimethyl-.http://webbook.nist.gov/(accessed Oct. 5, 2014). ^ Rajamannan, A. H. J. Process for sterilizing soil. US Patent 59895

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