Metam-sodium (Ref: N 869) |
Last updated: 24/10/2024 |
(Also known as: metham; methylcarbamodithioic acid, sodium salt; carbam; carbathion; metam; metham-sodium) |
SUMMARY |
Data alerts |
The following alerts are based on the data in the tables below. An absence of an alert does not imply the substance has no implications for human health, biodiversity or the environment but just that we do not have the data to form a judgement.
Environmental fate | Ecotoxicity | Human health |
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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; Damping off; Some nematodes | |
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Vegetables; Fruit; Ornamentals; Fiber crops; Cover crops; Leafy salads | |
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Efficacy is well established via extensive use and field trials | |
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Current | |
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1951, first reported |
UK regulatory status |
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Approved | ||
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30/06/2025 | ||
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No data |
EC Regulation 1107/2009 (repealing 91/414) |
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Approved | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Belgium | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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30/11/2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Yes - low ADI / ARfD / AOEL | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Yes | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Additional information |
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Morocco |
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Chemical structure |
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None | |
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C₂H₄NNaS₂ | |
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CNC(=S)[S-].[Na+] | |
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- | |
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AFCCDDWKHLHPDF-UHFFFAOYSA-M | |
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InChI=1S/C2H5NS2.Na/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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Herbicide, Fungicide, Nematicide, Insecticide, Other substance | |
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Biocide, Slimicide, Preservative, Disinfectant, Algicide | |
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Carbamate fungicide; Dithiocarbamate fungicide; Carbamate herbicide; Dithiocarbamate herbicide; Carbamate nematicide; Dithiocarbamate nematicide | |
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965 g kg⁻¹ | |
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EU 2023 dossier - N,N’-dimethylthiourea 18.7 g kg⁻¹ | |
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Synthetic | |
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Soil fumigant, binds to oxygen carrying molecules and prevents tissues from using oxygen. Multi-site activity. | |
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137-42-8 | |
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205-293-0 | |
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20.011 | |
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039003 | |
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5366415 | |
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006-013-00-8 | |
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129.19 | |
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- | |
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sodium N-methyldithiocarbamate | |
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methylcarbamodithioic acid sodium salt | |
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Marine Pollutant | |
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- | |
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A/C1 | |
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1/5 | |
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8F | |
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M03 | |
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- | |
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White to pale yellow crystalline powder | |
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Formulations |
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Often supplied as a soluble concentrate or liquid fumigant |
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578290 | 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 |
High | ||||||||
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212.6 | 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 ) n-Heptane5 = Verified data used for regulatory purposes |
- | ||||||||
261.1 | 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 ) Xylene5 = Verified data used for regulatory purposes |
- | |||||||||
203.2 | 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 ) Ethyl acetate5 = Verified data used for regulatory purposes |
- | |||||||||
218.8 | 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 ) Acetone5 = Verified data used for regulatory purposes |
- | |||||||||
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86.5 | 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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Decomposes before boiling | 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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150 | 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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97 | 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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1.23 X 10-03 | Calculated | - | |||||||
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-2.91 | 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 |
Low | ||||||||
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Insoluble | A4 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 ) 4 = Verified data |
- | |||||||
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Regulatory data basd on LogP | A4 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 ) 4 = Verified data |
- | ||||||||
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- | - | - | ||||||||
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2.99 | 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 |
- | ||||||||
pKa(2) = 11.06 | |||||||||||
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57.4 | 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 |
Highly volatile. If applied directly to plants or soil, drift is a concern & mitigation is advisable | ||||||||
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8.34 X 10-06 | 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 |
Non-volatile | ||||||||
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- | - | - | ||||||||
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Neutral solution: 205.0nm = 7502.8, 248.0nm = 7942.3, 280.0nm = 9924.0, 290nm >10 Acidic solution: can not measured due to rapid hydrolysis Basic solution: 248.0nm = 8042.5, 280.0nm = 9796.8, 290nm >10 |
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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72.0 | 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 ) at 21°C5 = Verified data used for regulatory purposes |
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Degradation |
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Not readily biodegradable | ||||||||||
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7 | C4 C = AGRITOX dataset. Dataset is no longer available. 4 = Verified data |
Non-persistent | |||||||
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0.01 | 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 |
Non-persistent | ||||||||
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7 | C4 C = AGRITOX dataset. Dataset is no longer available. 4 = Verified data |
Non-persistent | ||||||||
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0.02 | 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 |
Non-persistent | ||||||||
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EU Dossier lab studies DT₅₀ range 4-22 minutes, DT₉₀ range 13-72 minutes; Other sources: up to 7 days | ||||||||||
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0.05 | 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 |
Fast | |||||||
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2.2 | 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 |
Non-persistent | |||||||
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pH sensitive: DT₅₀ 1.9 days at pH 5, 4.5 days at pH 9, all at 25 °C | ||||||||||
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1.0 | 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 ) 3 = Unverified data of known source |
Fast | ||||||||
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As this parameter is not normally measured directly, a surrogate measure is used: ‘Photochemical oxidative DT₅₀’. Where data is available, this can be found in the Fate Indices section below. | ||||||||||
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Soil adsorption and mobility |
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- | 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 ) 3 = Unverified data of known source |
Mobile | |||||||
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20 | ||||||||||
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EU dossier 2023 data | ||||||||||
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Fate indices |
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2.28 | Calculated | Transition state | ||||||||||||||||||||||||||
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1.54 X 10-02 | Calculated | - | |||||||||||||||||||||||||
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Low | Calculated | - | ||||||||||||||||||||||||||
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Mobile | Calculated | - | ||||||||||||||||||||||||||
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0.03 | Q2 Q = Miscellaneous data from online sources Estimated2 = Unverified data of unknown source |
Low potential | |||||||||||||||||||||||||
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Not available | - |
Known soil metabolites |
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Major fraction | 0.829 | - |
Known groundwater metabolites |
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Relevant | 0.004 | 24 |
Other known metabolites |
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methyl isothiocyanate (Ref: SN-32866) | MITC | Surface water; Sediment | - |
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Terrestrial ecotoxicology |
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896 | 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 ) Rat as metam5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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> 12 | 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 ) Rat Reproductive NOAEL5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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211 | 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 ) Colinus virginianus5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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> 448 mg kg bw⁻¹ day⁻¹ | A4 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 virginianus4 = Verified data |
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> 36.2 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents / FAO data, IPCS INCHEM data (US EPA Databases Related to Pesticide Risk Assessment ) Apis mellifera4 = Verified data |
Moderate | |||||||
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> 36.2 | F3 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents / FAO data, IPCS INCHEM data (US EPA Databases Related to Pesticide Risk Assessment ) Apis mellifera3 = Unverified data of known source |
Moderate | ||||||||
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Aquatic ecotoxicology |
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> 0.175 | 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 ) Lepomis macrochirus5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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0.464 | F3 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents / FAO data, IPCS INCHEM data (US EPA Databases Related to Pesticide Risk Assessment ) Oncorhynchus mykiss3 = Unverified data of known source |
Moderate | ||||||||
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> 0.25 | F3 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents / FAO data, IPCS INCHEM data (US EPA Databases Related to Pesticide Risk Assessment ) Danio rerio Embryo 1.8 day3 = Unverified data of known source |
Moderate | ||||||||
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0.99 | 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 ) Daphnia magna5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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1.08 | 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 ) Pseudokirchneriella subcapitata5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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General |
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High (class III) | - | - | ||||||||
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896 | 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 ) Rat as metam5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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2000 | 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 ) Rat5 = Verified data used for regulatory purposes |
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2.54 | 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 ) Rat 4 hr (whole body)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 ) Dog SF=100 as metam5 = 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 ) Rat SF=100 as metam5 = 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 ) Rabbit SF=100 as metam5 = 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 ) Dog SF=100 as metam5 = Verified data used for regulatory purposes |
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1-12 | 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 ) concentration dependent5 = Verified data used for regulatory purposes |
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Negligible risk to bystanders Low risk of exposure via diet |
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Low risk to operators and other workers utilising PPE/PPC | ||||||||||
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GB MRL levels for some commodities subject to change in late 2021 | ||||||||||
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Mainly eliminated via urine (85%) with remainder via expelled air | 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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Possible liver and urinary tract toxicant US EPA - probable human carcinogen, CLP data - suspected carcinogen Possible liver toxicant |
Handling issues |
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Corrosive May liberate toxic gas when in contact with acids Not explosive or oxidising IMDG Transport Hazard Class 6.1 Not likely to autoignite |
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Health: H372, H371, H361d, H351, H341, H332, H302, H314, H317 Environment: H400, H410 Handling: H290 |
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II (Moderately hazardous) | |||
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UN2757 | |||
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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-sodium | ||
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metam | ||
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Metam | ||
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metam | ||
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metam | ||
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metam | ||
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metam | ||
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metam-natrium | ||
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Record last updated: | 24/10/2024 |
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 |