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dazomet (Ref: N 521)
** thiazone ** tiazon ** DMTT ** BAS 00201N ** Translations

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

SUMMARY

Dazomet is a broad-spectrum pre-plant soil fumigant that has regulatory approval for use in the EU and is also used in Australia and USA. It is highly soluble in water and somewhat volatile. Based on its chemical properties it is not expected to leach to groundwater. Data suggests it is not persistent in either soil or water systems. It is moderately toxic to mammals with a low potential for bioaccumulation. Dazomet is a recognised irritant. It has a moderate toxicity to most aquatic organisms and birds and honeybees but presents more of a risk to earthworms.

GENERAL INFORMATION Click here for an explantaion of the general chemical status information
for dazomet

Description: A multi-purpose, non-selective pre-plant soil fumigant

Example pests controlled: Nematodes; Soil fungi; Soil insects including wireworms, cutworms; Weed seeds

Example applications: Golf-greens; Turf; Ornamentals; Nursery sites; Potting soil; Strawberry plots; Tomatoes; Tobacco

Efficacy & activity: -

Availability status: Current

Introduction & key dates: 1967, first registered USA

EC Regulation 1107/2009 (repealing 91/414):
Status Approved
Dossier rapporteur/co-rapporteur Belgium/Netherlands
Date inclusion expires 31/05/2021
EU Candidate for substitution (CfS) No
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 C5H10N2S2
Canonical SMILES CN1CN(C(=S)SC1)C
Isomeric SMILES No data
International Chemical Identifier key (InChIKey) QAYICIQNSGETAS-UHFFFAOYSA-N
International Chemical Identifier (InChI) InChI=1S/C5H10N2S2/c1-6-3-7(2)5(8)9-4-6/h3-4H2,1-2H3
2D structure diagram/image available? Yes

General status: Click here for further information on the general chemical status information used on this site
Pesticide type Insecticide, Fungicide, Herbicide, Fumigant
Substance group Carbamate
Minimum active substance purity 960 g/kg
Known relevant impurities EU dossier - None declared
Substance origin Synthetic
Mode of action Releases methyl isothiocyanate
CAS RN 533-74-4
EC number 208-576-7
CIPAC number 146
US EPA chemical code 035602
PubChem CID 10788
Molecular mass (g mol-1) 162.3
PIN (Preferred Identification Name) 3,5-dimethyl-1,3,5-thiadiazinane-2-thione
IUPAC name 3,5-dimethyl-1,3,5-thiadiazinane-2-thione
CAS name tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione
Other status information -
Relevant Environmental Water Quality Standards -
Herbicide Resistance Classification (HRAC) Z
Herbicide Resistance Classification (WSSA) -
Insecticide Resistance Classification (IRAC) 1A
Fungicide Resistance Classification (FRAC) Not known
Examples of recorded resistance -
Physical state Colourless crystals
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
  • Certis
  • BASF
  • Stauffer
  • Union Carbide
  • Hopkins Agriculture
Example products using this active
  • Basamid Granules
  • Mico-Fume
  • Mylone
UK LERAP status None
Formulation and application details Often supplied in granule formulations applied directly to the soil surface causing methyl isothiocyanate to be released.


ENVIRONMENTAL FATE

for dazomet

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) 3500 A5 High
Solubility - In organic solvents at 20oC (mg l-1) 89700 A5 - Acetone -
28500 A5 - Ethyl acetate -
21300 A5 - Methanol -
8600 A5 - Toluene -
Melting point (oC) 105 A5 -
Boiling point (oC) Decomposes before boiling A4 -
Degradation point (oC) 150 A5 -
Flashpoint (oC) Not expected to self ignite; Not highly flammable A5 -
Octanol-water partition coefficient at pH 7, 20oC P 4.27 X 1000 Calculated -
Log P 0.63 A5 Low
Bulk density (g ml-1)/Specific gravity 1.37 L3 -
Dissociation constant (pKa) at 25oC Not applicable A5 -
Note: No dissociation
Vapour pressure at 20oC (mPa) 1.1 A5 Low volatility
Henry's law constant at 25oC (Pa m3 mol-1) 5.10 X 10-05 A5 Non-volatile
GUS leaching potential index Click here for a note on the limitations of the GUS index -0.45 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 1.38 X 10-04 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 pH 6.2 solution: 208nm = 7308, 228.5nm = 4209, 246nm = 6209, 260nm = 4631, 283nm = 11378, 300nm = 3682 A5 -
Surface tension (mN m-1) 64.9 A5 at 20oC -

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) 0.52 Click here to see a warning relating to modelling and this active substance A5 Non-persistent
DT50 (lab at 20oC) 0.52 A5 Non-persistent
DT50 (field) 1.2 A5 Non-persistent
DT90 (lab at 20oC) 4.4 A5 -
DT90 (field) 3.8 A5 -
DT50 modelling endpoint - - -
Note EU dossier lab studies DT50 range: 0.07-5.4 days, DT90 range 0.8-18.0 days; field studies DT50 0.9-1.6 days, DT90 range 2.6-4.6 days; Other sources: DT50 7 days (DW3)
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 0.35 A5 Fast
Note DT50: 4 hrs in daylight, 7.3 hours in dark
Aqueous hydrolysis DT50 (days) at 20oC and pH 7 Value 0.2 A5 Non-persistent
Note Slightly vaiable with pH: DT50 0.4 days at pH 5, 0.1 days at pH 9 all at 25 degC
Water-sediment DT50 (days) 0.52 A5 Fast
Water phase only DT50 (days) 0.45 A3 Fast

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 Very mobile
Koc 10
Notes and range -
Freundlich Kf 1.13 A5 Moderately mobile
Kfoc 260
1/n 0.838
Notes and range EU dossier Kf range 0.808-1.834, kfoc range 129-394 mL/g, 1/n range 0.805-0.889, Soils=4
pH sensitivity No

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   0.740   Major fraction, Relevant
formaldehyde This metabolite may cause environmental pollution, click here for further information Soil   0.205   Major fraction, Relevant
methylamine Soil   0.092   Minor fraction, Not relevant
2,4-dimethyl-1,2,4-thiadiazolidine-5-thione This metabolite may cause environmental pollution, click here for further information Soil   0.450   Major fraction, Relevant

Other known metabolites:
Metabolite name and reference Aliases Formation medium / Rate Estimated maximum occurrence fraction Metabolising enzymes
ethyl-N-(3-hydroxyphenyl)-carbamate
Note: DT50 soil = 101 days
- Soil 0.49 -
1-(hydroxysulfanyl)-N-methyl-1-thioxomethanamine MATM Water - -
methyldithiocarbamic acid metam Water - -
1,3-dimethylthiourea DMTU Plant; Water - -
1,2,4-dithiazolidine-3-thione Metabolite 139 Water (hydrolysis) - -
methylurea - Soil - -
1,3-dimethylurea N,N.-dimethylurea Soil - -
1,3,5-trimethyl-1,3,5-triazinane-2-thione - unknown - -
1,3-thiazetidine 1-oxide - Water (photolysis) - -
(dimethylamino)methanethiol - Water (photolysis) - -
formic acid - Soil 0.081 -
1-methylthiourea MMTU Plant - -
1,1,3-trimethylthiourea TMTU Plant - -
1-(hydroxysulfanyl)-N-methyl-1-thioxomethanamine Metabolite 123 Water (hydrolysis) - -
[(disulfanylcarbonothioyl)amino]methane Metabolite 137 Water (hydrolysis) - -


ECOTOXICOLOGY

for dazomet

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) 3.1 Q2 Estimated Low potential
CT50 (days) Not available -
Mammals - Acute oral LD50 (mg kg-1) 415 A5 Rat Moderate
Mammals - Short term dietary NOEL (mg kg-1) - L1 Rat -
(ppm diet) 20 -
Birds - Acute LD50 (mg kg-1) > 415 A5 Colinus virginianus Moderate
Birds - Short term dietary (LC50/LD50) 197 mg kg bw-1 day-1 A5 Colinus virginianus -
Fish - Acute 96 hour LC50 (mg l-1) 0.3 A5 Lepomis macrochirus Moderate
Fish - Chronic 21 day NOEC (mg l-1) - - -
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) 19.0 A5 Daphnia magna Moderate
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1) - - -
Aquatic crustaceans - Acute 96 hour LC50 (mg l-1) 0.5 F3 Americamysis bahia Moderate
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) 3.5 A5 Lemna gibba Moderate
Non-target plants - - -
- - -
Algae - Acute 72 hour EC50, growth (mg l-1) 0.275 A5 Pseudokirchneriella subcapitata Moderate
Algae - Chronic 96 hour NOEC, growth (mg l-1) - - -
Honeybees (Apis spp.) Contact acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) > 24 F4 Moderate
Oral acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
Unknown mode acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
Bumblebees (Bombus spp.) Contact acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
-
Oral acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
-
Mason bees (Osmia spp.) Contact acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
Oral acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
Other pollinators (1) Acute LD50 (worst case from 24 , 48 and 72 hour values - μg insect-1) - - -
Mode of exposure -
Other pollinators (2) Acute LD50 (worst case from 24 , 48 and 72 hour values - μg insect-1) - - -
Mode of exposure -
Earthworms - Acute 14 day LC50 (mg kg-1) 6.5 A5 Eisenia foetida High
Earthworms - Chronic 14 day NOEC, reproduction (mg kg-1) - - -
Other soil macro-organisms - e.g. Collembola LR50 / EC50 / NOEC / % Effect > 100 A5 Folsomia candida, % Mortality [Dose: 485 kg ha-1] -
Other arthropod (1) LR50 g ha-1 - - -
% Effect -3.4
5.8
Mortality
Food consumption
Dose: 485 kg ha-1
A5 Poecilus cupreus, adult
-
Other arthropod (2) LR50 g ha-1 - - -
% Effect -99.6 Reproduction
Dose: 485 kg ha-1
A5 Aleochara bilineata, adult
-
Soil micro-organisms - - -
Mesocosm study data NOEAEC mg l-1 - - -
NOEAEC mg l-1 - - -


HUMAN HEALTH AND PROTECTION

for dazomet

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) 415 A5 Rat Moderate
Mammals - Dermal LD50 (mg kg-1 body weight) > 1000 A5 Rat -
Mammals - Inhalation LC50 (mg l-1) > 7.3 A5 Rat -
Other Mammal toxicity endpoints - -
ADI - Acceptable Daily Intake (mg kg-1bw day-1) 0.01 A5 Rat, SF=100 -
ARfD - Acute Reference Dose (mg kg-1bw day-1) 0.03 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) 0.015 A5 Rat, SF=100 -
Dermal penetration studies (%) 3.0 A5 -
Dangerous Substances Directive 76/464 - - -
Exposure Routes Public No unacceptable risks to bystanders identified
Occupational No unacceptable risks to operators or other workers identified
European MRLs Click here for the EU MRL pesticide database
Drinking Water Standards - - -
Drinking Water MAC (μg l-1) - - -

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

A2; B2; C3; D0; E0

-

Respiratory tract irritant Skin irritant Skin sensitiser Eye irritant Phototoxicant

-

General human health issues Possible liver toxicant
Key: Genotoxicity
A: Chromosome aberration (EFSA database)
B: DNA damage/repair (EFSA database)
C: Gene mutation (EFSA database)
D: Genome mutation (EFSA database)
E: Unspecified genotoxicity type (miscellaneous data source)
0: No data
1: Positive
2: Mixed/ambiguous results
3: Negative
Key: Other
: 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
Prevent generation of dust
Not explosive or oxidising
IMDG Transport Code is usually 9
CLP classification 2013 Health: H302, H318
Environment: H400, H410
EC Risk Classification Click here to view information omn the EU risk phrases Xn - Harmful: R22
Xi - Irritant: R36
N - Dangerous for the environment: R50, R53
EC Safety Classification Click here to view information omn the EU safety phrases S2, S15, S22, S24, S60, S61
WHO Classification II - Moderately hazardous
UN Number Usually 3077
Waste disposal & packaging Click here for a description of UN packaging marks Packaging Group III (minor danger)


TRANSLATIONS

for dazomet

Language Name
English dazomet
French dazomet
German Dazomet
Danish dazomet
Italian dazomet
Spanish dazomet
Greek dazomet
Slovenian dazomet
Polish dazomet
Swedish dazomet
Hungarian dazomet
Dutch dazomet

Record last updated: Tuesday 25 June 2019
Contact: aeru@herts.ac.uk