Metam-potassium |
![]() Last updated: 12/01/2021 |
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(Not known by any other names) |
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A multi-action crop protection agent used as a pre-planting soil sterilant | |
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Weed and disease suppression including control of annual bluegrass, chickweed, ragweed, nutgrass, morning glory, Sclerotina, club root and Rhizoctonia | |
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Vegetables; Fruit; Ornamentals; Fiber crops; Cover crops | |
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Unknown | |
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1951, first reported |
UK regulatory status |
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Not approved | ||
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30/06/2025 | ||
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None (may vary with mixtures) |
EC Regulation 1107/2009 (repealing 91/414) |
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Belgium | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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30/06/2022 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Yes - low ADI / ARfD / AOEL | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Yes | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Also used in |
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Chemical structure |
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C₂H₄KNS₂ | |
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CNC(=S)[S-].[K+] | |
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No data | |
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DQRQIQZHRCRSDB-UHFFFAOYSA-M | |
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InChI=1S/C2H5NS2.K/c1-3-2(4)5;/h1H3,(H2,3,4,5);/q;+1/p-1 | |
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Yes |
General status |
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Fungicide, Insecticide, Nematicide, Soil sterilent | |
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Carbamate | |
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Synthetic | |
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Soil fumigant, binds to oxygen carrying molecules and prevents tissues from using oxygen. | |
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137-41-7 | |
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205-29-25 | |
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039002 | |
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23690432 | |
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145.28 | |
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potassium methylcarbamodithioate | |
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postassium methylcarbamodithioate | |
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potassium N-methylcarbamodithioate | |
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PAN bad actor; Marine pollutant | |
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Not known | |
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Not known | |
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1A | |
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Not known | |
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Colourless crystalline solid | |
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Formulations |
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Usually supplied formulated for use as a fumigant |
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722000 | Q3 Q = Miscellaneous internet resources 3 = Unverified data of known source |
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5000 | Q3 Q = Miscellaneous internet resources Acetone3 = Unverified data of known source |
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5000 | Q3 Q = Miscellaneous internet resources Ethanol3 = Unverified data of known source |
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5000 | Q3 Q = Miscellaneous internet resources Xylene3 = Unverified data of known source |
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Decomposes before melting | Q3 Q = Miscellaneous internet resources 3 = Unverified data of known source |
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Decomposes before boiling | Q3 Q = Miscellaneous internet resources 3 = Unverified data of known source |
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Degradation |
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Soil adsorption and mobility |
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Fate indices |
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Key metabolites |
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Soil | 0.829 | Major fraction, Relevant |
Other known metabolites |
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N,N’-dimethylthiourea | DMTU | Groundwater; Water/sediment | - | - | |||||
dimethylurea | DMU | Water/sediment | - | - | |||||
- | DMTD | Water/sediment | - | - |
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630 | Q3 Q = Miscellaneous internet resources Rabbit3 = Unverified data of known source |
Moderate | ||||||||
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> 211 | A3 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Colinus virginianus> as metam-sodium3 = Unverified data of known source |
Moderate | ||||||||
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> 54.0 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Oncorhynchus mykiss4 = Verified data |
Moderate | ||||||||
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> 4.6 | P4 P = Other governments and regulators Daphnia magna4 = Verified data |
Moderate | ||||||||
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> 400 | A2 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Eisenia foetida for metam-sodium2 = Unverified data of unknown source |
Moderate | ||||||||
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General |
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High (class III) | - | - | ||||||||
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630 | Q3 Q = Miscellaneous internet resources Rabbit3 = Unverified data of known source |
Moderate | ||||||||
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1000 | Q3 Q = Miscellaneous internet resources Rat3 = Unverified data of known source |
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0.001 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
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0.1 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
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0.001 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
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Health issues |
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Highly toxic |
Handling issues |
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Corrosive May liberate toxic gas when in contact with acids Not explosive or oxidising IMDG Transport Code is usually 8 |
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Health: H302, H314, H317 Environment: H400, H410 |
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Reproduction risk category 3: R63 Xn - Harmful: R22, R43 H - Handling risks: R31, R34 N - Dangerous for the environment: R50, R53 |
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S1/2, S26, S36/37/39, S45, S60, S61 | |||
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II (Moderately hazardous) | |||
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2771 for active, variable with product, usually 3082 or 3267 | |||
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Spilled product is a hazardous waste and disposal must be at an approved manner Packaging Group III (minor danger) |
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metam-potassium | ||
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Record last updated: | 12/01/2021 |
Contact: | aeru@herts.ac.uk |
Please cite as: | Lewis, K.A., Tzilivakis, J., Warner, D. and Green, A. (2016) An international database for pesticide risk assessments and management. Human and Ecological Risk Assessment: An International Journal, 22(4), 1050-1064. DOI: 10.1080/10807039.2015.1133242 |