Metam sodium

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Metam sodium[1]
Metham sodium.png
Ball-and-stick model of the component ions of metham sodium
IUPAC name
Sodium methylaminomethanedithioate
Other names
Metham sodium
3D model (JSmol)
ECHA InfoCard 100.004.812
Molar mass 129.18 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Metam sodium is an organosulfur compound (formally a dithiocarbamate), which is used as a soil fumigant, pesticide, herbicide, and fungicide. It is one of the most widely used pesticides in the United States, with approximately 60 million pounds used in 2001.[2] Metam sodium is the sodium salt of methyl dithiocarbamate.

Metam sodium can be prepared from methylamine, carbon disulfide, and sodium hydroxide; or from methyl isothiocyanate and sodium thiolate.[1]

Upon exposure to the environment, metam sodium decomposes to form methyl isothiocyanate.[3]

Metam sodium is a documented cause of reactive airways dysfunction syndrome[citation needed].

In 1991 a tank car with 19,000 gallons of Metam sodium spilled into Sacramento River above Lake Shasta. This killed all fish in a 41-mile stretch of the river. 20 years later the rainbow trout population has recovered.[4]

See also[edit]


  1. ^ a b Merck Index, 11th Edition, 5860.
  2. ^ 2000-2001 Pesticide Market Estimates Archived 2009-02-07 at the Wayback Machine, U.S. Environmental Protection Agency
  3. ^ Review of Metam Sodium, Dazomet, Methylisothiocyanate (MITC), Australian Pesticides and Veterinary Medicines Authority, June 1997
  4. ^ "Largest chemical spill in California history". Retrieved 2017-12-11.

External links[edit]