Information
Metsulfuron methyl technical
Metsulfuron methyl water dispersible granules
methyl 2-[[(4-methoxy-6-methyl-1,3,5-triazine-2-yl)aminocarbonyl]aminosulfonyl]benzoate
AGP:CP/349
COMMON NAME: metsulfuron methyl
STRUCTURAL FORMULA
EMPIRICAL FORMULA: C14H15N5O6S
RMM: 381.37
CAS REGISTRY NUMBER: 74223-64-6
CIPAC CODE NUMBER: 441
CHEMICAL NAMES:
methyl 2-(4-methoxy-6-methyl-1,3,5-trazine-2-ylcarbamoylsulfamoyl)benzoate (IUPAC)methyl 2-[[(4-methoxy-6-methyl-1,3,5-triazine-2 yl)aminocarbonyl]aminosulfonyl]benzoate (CA)
FAO Specification 441/TC/S/P (1997)
1. DESCRIPTION
The material shall consist of technical metsulfuron methyl, homogeneous and free from added modifying agents, and shall be a crystalline solid with a sweet ester-like odour. The colour of the material is off-white to beige.
2. ACTIVE INGREDIENT
2.1 Identity Test (Note 1)An identity test is required if the identity of the active ingredient is in doubt (e.g. HPLC or IR spectrum).
2.2 Metsulfuron methyl (5441/TC/M/3, CIPAC H, to be published) (Note 1)
The metsulfuron methyl content shall be declared (not less than 960 g/kg) and when determined, the content obtained shall not differ from the declared by more than ± 25 g/kg.
3. IMPURITIES
3.1 Water (MT 30.1, CIPAC F, p. 91)Maximum: 3.0 g/kg.
3.2 Material insoluble in acetone (MT 27, CIPAC F, p. 88)
Maximum: 10 g/kg.
4. PHYSICAL PROPERTIES
4.1 Melting point (MT 2, CIPAC F, p. 5)Melting point range: 156-158°C.
NOTE 1. Methods available from the Pesticide Information Officer, FAO Plant Production and Protection Division.
FAO Specification 441/WG/S/P (1997)
1. DESCRIPTION
The material shall consist of a homogeneous mixture of technical metsulfuron methyl, complying with the requirement of FAO Specification 441/TC/S/P (1997) together with fillers and any other necessary formulants in the form of granules to be applied after disintegration and dispersion in water. The product is dry, free-flowing and free from visible extraneous matter and hard lumps.
2. ACTIVE INGREDIENT
2.1 Identity Test (Note 1)An identity test is required if the identity of the active ingredient is in doubt (e.g. RPLC or IR spectrum).
2.2 Metsulfuron methyl (441/WG/M/3, CIPAC H, to be published) (Note 1)
The metsulfuron methyl content shall be declared and when determined, the content obtained shall not differ from that declared by more than the following amounts:
|
Declared content |
Permitted tolerance |
|
above 100 up to 250 g/kg |
± 6% of declared content |
|
above 250 up to 500 g/kg |
± 5% of declared content |
|
above 500 g/kg |
± 25 g/kg |
3. IMPURITIES
3.1 Water (MT 30.1, CIPAC F, p. 91)Maximum: 15 g/kg.
4. PHYSICAL PROPERTIES
4.1 pH range (MT 75, CIPAC F, p. 205)pH range: 3.0 to 9.0.
4.2 Wetting of the product with swirling (MT 53.3.2, CIPAC F, p. 165)
It shall be completely wetted in 60 seconds with swirling.
4.3 Wet sieve test (MT 167, CIPAC F, p. 416)
Maximum: 2.0% retained on a 75 m m test sieve.
4.4 Suspensibility (MT 168, CIPAC F, p. 417)
A minimum of 65% of the metsulfuron methyl found under 2.2 shall be in suspension after 30 minutes in CIPAC standard water D at 30°C ± 2°C (Note 2).
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: 70%.
4.6 Persistent foam (MT 47, CIPAC F, p. 152)
Maximum: 25 ml after 1 minute (Note 3).
4.7 Dustiness (MT 171.1, CIPAC F, p. 425)
Maximum: 30 mg collected dust.
4.8 Flowability (MT 172, CIPAC F, p. 430) (Note 4)
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 product shall continue to comply with 2.2, 4.1, 4.3, 4.4 and 4.5.
NOTES
1. Methods available from the Pesticide Information Officer, FAO Plant Production and Protection Division.2. A 1 gr sample was used.
3. A 0.1 gr sample was used.
4. The test sample was aged at 45°C ± 2°C for six weeks instead of 54°C ± 2°C for two weeks. It was also stored at 50°C ± 1°C for four weeks in accordance with the "Guidelines for Storage Stability Requirements for UK Registration", Section 2.3.1, page 4, issued by the Ministry of Agriculture, Fisheries and Food; Pesticides Safety Division, in December 1992.
