Information
Thiodicarb technical
Thiodicarb aqueous suspension concentrates
Thiodicarb water dispersible granules
Thiodicarb wettable powders
dimethyl N, N'-[thiobis[(methylimino)carbonyloxy]]bis[ethanimidothioate]
AGP:CP/351
COMMON NAME: thiodicarb
STRUCTURAL FORMULA
EMPIRICAL FORMULA: C10H18N4O4S3
RMM: 354.5
CAS REGISTRY NUMBER: 59669-26-0
CIPAC CODE NUMBER: 543
CHEMICAL NAME:
dimethyl N, N'-[thiobis[(methylimino)carbonyloxy]]bis[ethanimidothioate] (CA)
FAO Specification 543/TC/S/F (1997)
1. DESCRIPTION
The material shall consist of thiodicarb together with related manufacturing impurities and shall be a white to light tan crystalline powder free from visible extraneous matter and added modifying agents.
2. ACTIVE INGREDIENT
2.1 Identity tests (543/TC/M/2, CIPAC H, to be published) (Note 1)An identity test is required if the identity of the active ingredient is in doubt (e.g. chromatographic retention time under analytical conditions of the method of analysis or IR Spectrum).
2.2 Thiodicarb (543/TC/M/3, CIPAC H, to be published) (Note 1)
The thiodicarb content shall be declared (not less than 940 g/kg) and, when determined, the content obtained shall not differ from that declared by more than ± 20 g/kg.
3. IMPURITIES
3.1 Manufacturing impurities (Note 1)Methomyl: Maximum 5 g/kg.
4. PHYSICAL PROPERTIES
4.1 Melting point (MT 2, CIPAC F, p. 5)Melting point range: 158 to 163°C.
4.2 pH range (MT 75, CIPAC F, p. 205)
pH range: 5.8 to 6.6.
NOTE 1 Methods available from the Pesticides Information Officer, FAO Plant Production and Protection Division.
FAO Specification 543/SC/S/F (1997)
1. DESCRIPTION
The material shall consist of a suspension of fine particles of technical thiodicarb, complying with the requirements of FAO specification 543/TC/S/F (1997), in an aqueous phase, together with suitable formulants. After gentle agitation the material shall be homogeneous (Note 1) and suitable for further dilution in water.
2. ACTIVE INGREDIENT
2.1 Identity tests (543/SC/M/2, CIPAC H, to be published) (Note 2)An identity test is required if the identity of the active ingredient is in doubt (e.g. chromatographic retention time under conditions of the method of analysis or IR Spectrum)
2.2 Thiodicarb (543/SC/M/3, CIPAC H, to be published) (Note 2)
The thiodicarb content shall be declared (g/l at 20°C, Note 3) and, when determined, the content obtained shall not differ from that declared by more than the following amounts:
|
Declared content |
Permitted tolerance |
|
up to 5 00 g/l |
± 5% of the declared content |
|
above 500 g/l |
± 25 g/l |
3. IMPURITIES
3.1 Manufacturing impurities (Note 2)Methomyl: Maximum 0.5 % of the thiodicarb content found under 2.2.
4. PHYSICAL PROPERTIES
4.1 Mass per millilitre at 20°C (MT 3.3, CIPAC F, p. 18) (Note 3)The range of the mass per millilitre (g/ml) at 20°C shall be declared.
4.2 pH range (MT 75.2, CIPAC F, p. 205)
pH range: 4.0 to 7.0.
4.3 Pourability (MT 148, CIPAC F, p. 348. Note 4)
Maximum "residue": 5%.
Maximum "rinsed residue": 0.6%.
4.4 Spontaneity of dispersion (MT 160, CIPAC F, p. 391)
A minimum of 90 % of the content found under 2.2 shall be in suspension after 5 min. in CIPAC Standard Water D at 30°C ± 2°C.
Alternatively, if the buyer required other CIPAC Standard Waters or temperatures to be used, then this shall be specified when ordering.
4.5 Suspensibility (MT 161, CIPAC F, p. 394) (Note 5)
A minimum of 70% of the content found under 2.2 shall be in suspension after 30 min. in CIPAC Standard Water D at 30°C ± 2°C.
Alternatively, if the buyer requires other CIPAC Standard Waters or temperatures to be used, then this shall be specified when ordering.
4.6 Wet sieve test (MT 59.3, CIPAC F, p. 179) (Note 6)
Maximum: 1 % of the product shall be retained on a 75 ìm test sieve.
4.7 Persistent foam (MT 47.2, CIPAC F, p. 152) Maximum: 15 ml after 1 min. (10 g/l dilution).
5. STORAGE STABILITY
5.1 Stability at 0°C (MT 39.1, CIPAC F, p. 128)After storage at 0°C ± 1°C for 7 days, the product shall continue to comply with 4.4, 4.5 and 4.6.
5.2 Stability at 54°C (MT 46.1, CIPAC F, p. 149)
After storage at 54°C ± 2°C for 14 days, the determined average active ingredient content must not be lower than 95% relative to the determined average content found before storage (Note 7) and the product shall continue to comply with 3.1, 4.2, 4.3, 4.4,4.5 and 4.6.
NOTES
1. Before sampling to verify product quality, inspect the commercial container carefully. On standing, suspension concentrates usually develop a concentration gradient from the top to the bottom of the container. This may even result in the appearance of a clear liquid on the top and/or of sediment on the bottom. Therefore, before sampling, homogenize the product according to the instructions given by the manufacturer or, in the absence of such instructions, by gentle shaking of the commercial container (for example by inverting the closed container several times). Large containers must be opened and stirred adequately. After tins procedure, the container should not contain a sticky layer of non-dispersed product at the bottom. A suitable and simple method of checking for a non-dispersed sticky layer ("cake") is by probing with a glass rod or similar device adapted to the size and shape of the container. All the physical and chemical tests must be carried out on a laboratory sample taken after the recommended homogenization procedure.2. Methods available from the Pesticides Information Officer, FAO Plant Production and Protection Division.
3. Unless homogenization is carried out carefully, it is possible for the sample to MT 3.3 are used.
If the buyer requires both g/kg and g/l at 20°C, then in case of dispute, the analytical results shall be calculated as g/kg.
4. This is to ensure that the user can make use of the maximum amount of the ' product in the container. Suspension concentrates are fairly viscous products. The test determines the ease with which the formulation pours out of the container and how easily it rinses out.
5. Chemical assay is the only fully reliable method of measuring the mass of active ingredient still in suspension. However, simple methods such as gravimetric and solvent extraction determination may be used on a routine basis provided that these methods have been shown to give equal results to those of the chemical assay method. In case of dispute the chemical method shall be the "Referee method".
6. This test detects coarse particles (e.g. caused by crystal growth) or agglomerates (crust formation) or extraneous material which could cause blockage of spray nozzles or filters in the spray tank.
7. Analysis of the product before and after storage should be carried out at the same time (i.e. after storage) to reduce the analytical error.
FAO Specification 543/WG/S/F (1997)
1. DESCRIPTION
The material shall consist of a homogeneous mixture of technical thiodicarb, complying with the requirements of FAO Specification 543/TC/S/F (1997), together with filler(s) and any other necessary formulants in the form of granules to be applied after desintegration and dispersion in water. The product shall be dry, free-flowing and free from visible extraneous matter and hard lumps.
2. ACTIVE INGREDIENT
2.1 Identity tests (543/WG/M/2, CIPAC H, to be published) (Note 1)An identity test is required if the identity of the active ingredient is in doubt (e.g. chromatographic retention time under conditions of the method of analysis or IR spectrum).
2.2 Thiodicarb (543/WG/M/3, CIPAC H, to be published) (Note 1)
The thiodicarb content shall be declared (g/kg) and, when determined, the content obtained shall not differ from that declared by more than the following amounts:
|
Declared content |
Permitted tolerance |
|
up to 500 g/kg |
± 5% of the declared content |
|
above 500 g/kg |
± 25 g/kg |
3. IMPURITIES
3.1 Manufacturing impurities (Note 1)Methomyl: Maximum 0.5% of the thiodicarb content found under 2.2.
3.2 Water (MT 30, CIPAC F, p. 91)
Maximum: 15 g/kg.
4. PHYSICAL PROPERTIES
4.1 pH range (MT 75.2, CIPAC F, p. 205)pH range: 4.0 to 7.0.
4.2 Wetting of the product without swirling (MT 53.3.1, CIPAC F, p. 165)
It shall be completely wetted in 2 minutes without swirling.
4.3 Wet sieve test (MT 167, CIPAC F, p. 416)
Maximum: 1 % retained on a 75 m m test sieve.
4.4 Suspensibility (MT 168, CIPAC F, p. 417) (Notes 2 and 3)
A minimum of 70 % of the thiodicarb content found 2.2 shall be in suspension after 30 minutes in CIPAC Standard Water D at 30°C ± 2°C.
Alternatively, if the buyer requires other CIPAC Standard Waters or temperatures to be used, then this shall be specified.
4.5 Degree of dispersion (MT 174, CIPAC F, p. 435)
Minimum: 90%
4.6 Persistent foam (MT 47.1, CIPAC F, p. 152)
Maximum: 15 ml after 1 minute (10 g/l dilution).
4.7 Dustiness (MT 171.1, CIPAC F, p. 425) (Note 4)
Maximum: 12 mg collected dust.
4.8 Flowability (MT 172, CIPAC F, p. 149)
100% of the product shall pass through a 5 mm test sieve after 20 drops of the sieve.
5. STORAGE STABILITY
5.1 Stability at 54°C (MT 46.1.1, CIPAC F, p. 149)After storage at 54°C ± 2°C for 14 days the determined average active ingredient content must not be lower than 95% relative to the determined average content found before storage, and the product shall continue to comply with: 3.1, 4.1, 4.3, 4.4 and 4.5 (Note 5)
NOTES
1 Methods available from the Pesticides Information Officer, FAO Plant Production and Protection Division.2. Chemical assay is the only fully reliable method of measuring the mass of active ingredient still in suspension. However, simple methods such as gravimetric and solvent extraction determination may be used on a routine basis provided that these methods have been shown to give equal results to those of the chemical assay method. In case of dispute the chemical method shall be the "Referee method".
3. The product should be tested at the highest and lowest rates of use recommended by the supplier, provided this is consistent with the conditions given in method, MT 168 CIPAC F, p. 417.
4. The optical method (MT 171.2) usually shows good correlation to the gravimetric method (MT 171.1) and can therefore be used as an alternative,. where the equipment is available. Where the correlation is in doubt, it must be checked with the product to be tested.
5. Analysis of the product before and after storage should be carried out at the same ime (i.e. after storage) to reduce the analytical error.
FAO Specification 543/W/S (1997)
1. DESCRIPTION
The material shall consist of a homogeneous mixture of technical thiodicarb, complying with the requirements of FAO specification 543/TC/S/F (1997) together with filler(s) and any other necessary formulants. It shall be in the form of a fine powder free from visible extraneous matter and hard lumps.
2. ACTIVE INGREDIENT
2.1 Identity tests (543/WP/M/2, CIPAC H, to be published) (Note 1)An identity test is required if the identity of the active ingredient is in doubt (e.g. chromatographic retention time under conditions of the method of analysis or IR Spectrum).
2.2 Thiodicarb (543/WP/M/3, CIPAC H, to be published) (Note 1)
The thiodicarb content shall be declared (g/kg) and, when determined, the content obtained shall not differ from that declared by more than the following amounts:
|
Declared content |
Permitted tolerance |
|
up to 500 g/kg |
± 5% of the declared content |
|
above 500 g/kg |
± 25 g/kg |
3. IMPURITIES
3.1 Manufacturing impurities (Note 1)Methomyl: Maximum 0.5% of the thiodicarb content found under 2.2.
3.2 Water (MT 30.1, CIPAC F, p. 91)
Maximum: 20 g/kg.
4. PHYSICAL PROPERTIES
4.1 pH range (MT 75.2, CIPAC F, p. 206)pH range: 4.0 to 7.0.
4.2 Wet sieve test (MT 59.3, CIPAC F, p. 179)
Maximum: 0.5 % retained on a 75 ìm test sieve.
4.3 Suspensibility (MT 15.1, CIPAC F, p. 45) (Note 2)
A minimum of 70% of the thiodicarb content found under 2.2 shall be in suspension (Note 3) after 30 mins. in CIPAC Standard Water D at 30°C ± 2°C.
Alternatively, if the buyer requires other CIPAC Standard Waters or temperatures to be used, then this shall be specified when ordering.
4.4 Persistent foam (MT 47.1, CIPAC F, p. 152)
Maximum: 15 ml after 1 min. (10 g/l dilution).
4.5 Wetting of the product without swirling (MT 53.3.1, CIPAC F, p. 165)
It shall be completely wetted in 2 minutes without swirling.
5. STORAGE STABILITY
5.1 Stability at 54°C (MT 46.1.1, CIPAC F, p. 149)After storage at 54 ± 2°C for 14 days, the determined average active ingredient content must not be lower than 95% relative to the determined average content found before storage (Note 4) and the product shall continue to comply with 3.1, 4.1, 4.2, and 4.3.
NOTES
1. Methods available from the Pesticides Information Officer, FAO Plant Production and Protection Division.2. Chemical assay is the only fully reliable method of measuring the mass of active ingredient still in suspension. However, simple methods such as gravimetric and solvent extraction determination may be used on a routine basis provided that these methods have been shown to give equal results to those of the chemical assay method. In case of dispute the chemical method shall be the "Referee method".
3. For routine testing the sediment should be determined gravimetrically to reduce the analytical expense, as described in MT 168.
4. Analysis of the product before and after storage should be carried out at the same time (i.e. after storage) to reduce the analytical error.
