Metham Sodium
Title: Metham Sodium
CAS Registry Number: 137-42-8
CAS Name: Methylcarbamodithioic acid sodium salt
Additional Names: methyldithiocarbamic acid sodium salt; N-methylaminodithioformic acid sodium salt; sodium N-methylaminomethanethionothiolate; metam sodium; SMDC; carbathione; trimaton; VPM
Molecular Formula: C2H4NNaS2
Molecular Weight: 129.18
Percent Composition: C 18.60%, H 3.12%, N 10.84%, Na 17.80%, S 49.64%
Line Formula: CH3NHCSSNa
Literature References: Prepn: Compin, Bull. Soc. Chim. Fr. [4] 27, 464 (1920). Use as soil fumigant: S. C. Dorman, A. B. Lindquist, US 2766554 (1956 to Stauffer). Conversion to methyl isothiocyanate, q.v., in soil: N. J. Turner, M. E. Corden, Phytopathology 53, 1388 (1963); J. H. Smelt, M. Leistra, Pestic. Sci. 5, 401 (1974). Field study: J. A. Bunt, Meded. Fac. Landbouwwet. Rijksuniv. Gent 42, 1529 (1977); L. P. Moreno et al., Tests of Agrochemicals and Cultivars No. 17, (Ann. Appl. Biol. 128 Supplement), pp 6-13 (1996). Determn of efficacy: J. Krikun, Can. J. Plant Pathol. 8, 345 (1986).
Derivative Type: Dihydrate
Manufacturers' Codes: N-869
Trademarks: Maposol (Procida); Sistan (DuPont); Vapam
Properties: Crystals, anhydr at 130°. Unpleasant odor, similar to that of carbon disulfide. Non-flammable. Soly in water at 20°: 72.2 g/100 ml H2O. Moderately sol in alc. Sparingly sol in other solvents. Concd aq solns are stable.
CAUTION: Irritating to skin, mucous membranes: Clinical Toxicology of Commercial Products, R.E. Gosselin et al., Eds. (Williams & Wilkins, Baltimore, 5th ed., 1984) Section II, pp 312.
Use: Soil fumigant to control weeds and weed seeds, nematodes, fungi, and soil insects.

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