Metam potassium

Structural formula
General
Surname	Metam potassium
other names	Potassium N -methyldithiocarbamate Metam-K
Molecular formula	C 2 H 4 KNS 2
External identifiers / databases
CAS number 137-41-7 EC number 205-292-5 ECHA InfoCard 100.004.811 PubChem 23690432 Wikidata Q21045317
properties
Molar mass	145.29 g mol −1
Physical state	firmly
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 302-312-314-317-332-400 P: ?
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Metam-potassium is a chemical compound from the group of dithiocarbamates . Like the much more popular metam sodium, it is used as a soil disinfectant ( tamifume ). It releases methyl isocyanate in the soil .

It has also been shown in tests to be effective in combating sedge grasses .

In the European Union, on the basis of data that was not provided, it was decided in 2009 that Metam would no longer be listed as an approved active ingredient in plant protection products. In 2010, a manufacturer submitted a new application for approval and submitted the missing studies. In 2012, the Commission decided to approve Metam as an active ingredient in the EU. In Germany, Austria and Switzerland no pesticides with this active ingredient are approved.

Individual evidence

1. ↑ There is not yet a harmonized classification for this substance . A labeling of potassium methyldithiocarbamate in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on August 21, 2015, is reproduced from a self-classification by the distributor .
2. ↑ Nufarm: Tamifume 365  ( page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.  
3. ↑ ^{a b} Bielinski M. Santos: Drip-applied metam potassium and herbicides as methyl bromide alternatives for Cyperus control in tomato . In: Crop Protection . tape 28 , no. January 1 , 2009, doi : 10.1016 / j.cropro.2008.08.013 ( PDF ).
4. ↑ Decision of the Council of July 13, 2009 on the non-inclusion of Metam in Annex I of Directive 91/414 / EEC and the revocation of the authorizations for plant protection products with this active substance (PDF)
5. ↑ Directorate-General for Health and Consumer Protection : Review report for the active substance metam. , March 9, 2012.
6. ↑ General Directorate Health and Food Safety of the European Commission: Entry on Metam (incl. -Potassium and -sodium) in the EU pesticide database ; Entry in the national registers of plant protection products in Switzerland , Austria and Germany ; accessed on March 14, 2016.