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metam-sodium (Ref: N 869)
** metham ** methylcarbamodithioic acid, sodium salt ** carbam ** carbathion ** metam ** metham-sodium ** Translations

Environmental Fate - Ecotoxicology - Human Health - A to Z Index - Home

GENERAL INFORMATION Click here for an explantaion of the general chemical status information
for metam-sodium

Description: A multi-action crop protection agent used as a pre-planting soil sterilant

Example pests controlled: Weed and disease suppression including control of annual bluegrass, chickweed, ragweed, nutgrass, morning glory; Sclerotina, club root and Rhizoctonia; Damping off; Some nematodes

Example applications: Vegetables; Fruit; Ornamentals; Fiber crops; Cover crops

Efficacy & activity: -

Availability status: Current

Introduction & key dates: 1951, first reported

EC Regulation 1107/2009 (repealing 91/414):
Status Approved
Dossier rapporteur/co-rapporteur Belgium
Date inclusion expires 30/06/2022
EU Candidate for substitution (CfS) Yes - low ADI / ARfD / AOEL
Listed in EU database Yes

Approved for use () or known to be used () in the following European countries: Click to access a note on the approvals information on this site

AT

BE

BG

CY

CZ

DE

DK

EE

EL

ES

FI

FR

HR

HU

IE

IT

LT

LU

LV

MT

NL

PL

PT

RO

SE

SI

SK

UK

Also used in: Australia, USA

Chemical structure: Click here for further information on the general chemical status information used on this site
Isomerism -
Chemical formula C2H4NNaS2
Canonical SMILES CNC(=S)[S-].[Na+]
Isomeric SMILES No data
International Chemical Identifier key (InChIKey) AFCCDDWKHLHPDF-UHFFFAOYSA-M
International Chemical Identifier (InChI) InChI=1S/C2H5NS2.Na/c1-3-2(4)5;/h1H3,(H2,3,4,5);/q;+1/p-1
Structure diagram/image available? Yes

General status: Click here for further information on the general chemical status information used on this site
Pesticide type Herbicide, Fungicide, Nematicide, Insecticide
Substance group Carbamate
Minimum active substance purity 965 g/kg
Known relevant impurities EU dossier - methylisothiocyanate <12g/kg dry wt, N,Ní-dimethylthiourea 23.0 g/kg dry wt
Substance origin Synthetic
Mode of action Soil fumigant, binds to oxygen carrying molecules and prevents tissues from using oxygen.
CAS RN 137-42-8
EC number 205-293-0
CIPAC number 20.011
US EPA chemical code 039003
PubChem CID 5366415
Molecular mass (g mol-1) 129.19
PIN (Preferred Identification Name) -
IUPAC name sodium N-methyldithiocarbamate
CAS name methylcarbamodithioic acid sodium salt
Other status information Marine Pollutant
Relevant Environmental Water Quality Standards -
Herbicide Resistance Classification (HRAC) Z
Herbicide Resistance Classification (WSSA) -
Insecticide Resistance Classification (IRAC) Not applicable
Fungicide Resistance Classification (FRAC) Not known
Examples of recorded resistance -
Physical state White crystalline powder
Related substances & organisms

Formulations:
Property Click here for information on the general product and branding information used on this site Value
Example manufacturers & suppliers of products using this active now or historically
  • United Phosphorus
  • New Farm Australia
  • Sinochem
  • Vapam
Example products using this active
  • Discovery
  • Sistan
  • Maposol
  • Ucetam
UK LERAP status None
Formulation and application details Often supplied as a soluble concentrate or liquid fumigant.


ENVIRONMENTAL FATE

for metam-sodium

Property Click here for information on the parameters used to describe environmental fate on this site Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with fate data Interpretation Click here for information on the way in which we interpret environmental fate data
Solubility - In water at 20oC (mg l-1) 578290 A5 High
Solubility - In organic solvents at 20oC (mg l-1) 212.6 A5 - n-Heptane -
261.1 A5 - Xylene -
203.2 A5 - Ethyl acetate -
218.8 A5 - Acetone -
Melting point (oC) 88.5 A5 -
Boiling point (oC) Decomposes before boiling A5 -
Degradation point (oC) 150 A5 -
Flashpoint (oC) 97 A5 -
Octanol-water partition coefficient at pH 7, 20oC P 1.23 X 10-03 Calculated -
Log P -2.91 A5 Low
Bulk density (g ml-1)/Specific gravity - - -
Dissociation constant (pKa) at 25oC 2.99 A5 -
Note: pKa(2) = 11.06
Vapour pressure at 20oC (mPa) 57.5 A5 Highly volatile
Henry's law constant at 25oC (Pa m3 mol-1) 8.34 X 10-06 A5 Non-volatile
GUS leaching potential index Click here for a note on the limitations of the GUS index -5.50 Calculated Low leachability
SCI-GROW groundwater index (μg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate Click here for a note on the limitations of the SCI-GROW index Value 2.56 X 10-05 Calculated -
Note -
Potential for particle bound transport index Click here for a note on the limitations of the potential for particle bound transport index - Calculated Low
Maximum UV-vis absorption L mol-1 cm-1 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 -
Surface tension (mN m-1) 72.0 A5 at 21oC -

Degradation:
Property Click here for information on the parameters used to describe substance degradation Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with degradation data Interpretation Click here for information on the way in which we interpret substance degradation data
General biodegradability -
Soil degradation (days) (aerobic) DT50 (typical) 7 C4 Non-persistent
DT50 (lab at 20oC) 0.01 A5 Non-persistent
DT50 (field) 7 C4 Non-persistent
DT90 (lab at 20oC) 0.03 A5 -
DT90 (field) - - -
DT50 modelling endpoint - - -
Note EU Dossier lab studies DT50 range 4-22 minutes, DT90 range 13-72 minutes; Other sources: up to 7 days
Dissipation rate RL50 on plant matrix Value - - -
Note -
Dissipation rate RL50 on and in plant matrix Value - - -
Note -
Aqueous photolysis DT50 (days) at pH 7 Value 0.05 A5 Fast
Note -
Aqueous hydrolysis DT50 (days) at 20oC and pH 7 Value 2.2 A5 Non-persistent
Note pH sensitive: DT50 1.9 days at pH 5, 4.5 days at pH 9, all at 25 degC
Water-sediment DT50 (days) 0.07 A5 Fast
Water phase only DT50 (days) - - -

Soil adsorption and mobility:
Property Click here for information on the parameters used to describe substance adsorption and mobility Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with adsorption and mobility data Interpretation Click here for information on the way in which we interpret substance adsorption and mobility
Linear Kd - DW3 Mobile
Koc 17.8
Notes and range EU dossier data
Freundlich Kf - - -
Kfoc -
1/n -
Notes and range -
pH sensitivity -

Key metabolites:
Metabolite Formation medium Estimated maximum occurrence fraction 1107/2009 relevancy Click here for further information on 1107/2009 relevancy
methyl isothiocyanate (Ref: SN-32866) This metabolite may cause environmental pollution, click here for further information Soil   0.829   Major fraction, Relevant

Other known metabolites:
Metabolite name and reference Aliases Formation medium / Rate Estimated maximum occurrence fraction Metabolising enzymes
N,Ní-dimethylthiourea
Note: Toxicologically relevant
DMTU Groundwater; Water/sediment - -
dimethylurea DMU Water/sediment - -
- DMTD Water/sediment - -
IMPURITY: - - - -
N,Ní-dimethylthiourea DMTU Present in product - -


ECOTOXICOLOGY

for metam-sodium

Property Click here for information on the parameters used to describe substance ecotoxicology Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with ecotoxicology data Interpretation Click here for information on the way in which we interpret substance ecotoxicology
Bio-concentration factor BCF (l kg-1) 0.03 Q2 Estimated Low potential
CT50 (days) Not available -
Mammals - Acute oral LD50 (mg kg-1) 896 A5 Rat Moderate
Mammals - Short term dietary NOEL (mg kg-1) - - -
(ppm diet) - -
Birds - Acute LD50 (mg kg-1) 211 A5 Colinus virginianus Moderate
Birds - Short term dietary (LC50/LD50) > 448 mg kg bw-1 day-1 A4 Colinus virginianus -
Fish - Acute 96 hour LC50 (mg l-1) > 0.175 A5 Lepomis macrochirus Moderate
Fish - Chronic 21 day NOEC (mg l-1) - - -
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) 0.99 A5 Daphnia magna Moderate
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1) - - -
Aquatic crustaceans - Acute 96 hour LC50 (mg l-1) - - -
Sediment dwelling organisms - Acute 96 hour LC50 (mg l-1) - - -
Sediment dwelling organisms - Chronic 28 day NOEC, static, water (mg l-1) - - -
Sediment dwelling organisms - Chronic 28 day NOEC, sediment (mg kg-1) - - -
Aquatic plants - Acute 7 day EC50, biomass (mg l-1) - - -
Non-target plants - - -
- - -
Algae - Acute 72 hour EC50, growth (mg l-1) 1.08 A5 Pseudokirchneriella subcapitata Moderate
Algae - Chronic 96 hour NOEC, growth (mg l-1) - - -
Honeybees Contact acute 48 hour LD50 (μg bee-1) > 36.2 F4 Apis mellifera Moderate
Oral acute 48 hour LD50 (μg bee-1) - - -
Unknown mode acute 48 hour LD50 (μg bee-1) > 36.2 F3 Moderate
Earthworms - Acute 14 day LC50 (mg kg-1) - - -
Earthworms - Chronic 14 day NOEC, reproduction (mg kg-1) - - -
Other soil macro-organisms - e.g. Collembola LR50 / EC50 / NOEC / % Effect - - -
Other arthropod (1) LR50 g ha-1 - - -
% Effect -14.6 Reproduction
Dose: 608 kg ha-1
A5 Aleochara bilineata
-
Other arthropod (2) LR50 g ha-1 - - -
% Effect - - -
Soil micro-organisms - - -
Mesocosm study data NOEAEC mg l-1 - - -
NOEAEC mg l-1 - - -


HUMAN HEALTH AND PROTECTION

for metam-sodium

General:
Property Click here for information on the parameters used to describe human health and protection issues Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with human health and protection data Interpretation Click here for information on the way in which we interpret human health and protection data
Threshold of Toxicological Concern (Cramer Class) Click here for a note on the limitations of the Cramer class High (class III) - -
Mammals - Acute oral LD50 (mg kg-1) 896 A5 Rat Moderate
Mammals - Dermal LD50 (mg kg-1 body weight) > 2000 A5 Rat -
Mammals - Inhalation LC50 (mg l-1) 2.54 A5 Rat, 4 hr (whole body) -
Other Mammal toxicity endpoints - -
ADI - Acceptable Daily Intake (mg kg-1bw day-1) 0.001 A5 Dog, SF=100 -
ARfD - Acute Reference Dose (mg kg-1bw day-1) 0.1 A5 Rat, SF=100 -
AAOEL - Acute Acceptable Operator Exposure Level (mg kg-1 bw day-1) - - -
AOEL - Acceptable Operator Exposure Level - Systemic (mg kg-1bw day-1) 0.001 A5 Dog, SF=100 -
Dermal penetration studies (%) 1-12 A5 concentration dependent -
Dangerous Substances Directive 76/464 - - -
Exposure Limits - - -
Exposure Routes Public Negligible risk to bystanders
Low risk of exposure via diet
Occupational Low risk to operators and other workers utilising PPE/PPC
European MRLs Click here for the EU MRL pesticide database
Drinking Water Standards - - -
Drinking Water MAC (μg l-1) - - -

Health issues:
Carcinogen Mutagen Endocrine disrupter Reproduction / development effects Cholinesterase inhibitor Neurotoxicant

-

Respiratory tract irritant Skin irritant Skin sensitiser Eye irritant Phototoxicant

-

-

General human health issues Possible liver and urinary tract toxicant
USEPA - probable human carcinogen

: Yes, known to cause a problem
: No, known not to cause a problem
: Possibly, status not identified
- : No data found

Handling issues:
Property Click here for information on the parameters used to describe substance handling issues Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with data on handling issues Interpretation Click here for information on the way in which we interpret data on handling issues
General Click here for a description of the International Maritime Dangerous Goods (IMDG) codes Corrosive
May liberate toxic gas when in contact with acids
Not explosive or oxidising
IMDG Transport Code is usually 8
CLP classification 2013 Health: H302, H314, H317
Environment: H400, H410
EC Risk Classification Click here to view information omn the EU risk phrases Reproduction risk category 3: R63
Xn - Harmful: R22, R43
H - Handling risks: R31, R34
N - Dangerous for the environment: R50, R53
EC Safety Classification Click here to view information omn the EU safety phrases S1/2, S26, S36/37/39, S45, S60, S61
WHO Classification II - Moderately hazardous
US EPA Classification (formulation) - -
UN Number 2771 for active, variable with product, usually 3082 or 3267
Waste disposal & packaging Click here for a description of UN packaging marks Spilled product is a hazardous waste and disposal must be at an approved manner
Packaging Group III (minor danger)


TRANSLATIONS

for metam-sodium

Language Name
English metam-sodium
French metam
German Metam
Danish metam
Italian metam
Spanish metam
Greek -
Slovenian metam-natrij
Polish metam
Swedish -
Hungarian -
Dutch metam-natrium

Record last updated: Sunday 27 May 2018
Contact: aeru@herts.ac.uk