Acephate TC, EC, SP, WSG

Acephate TC, EC, SP, WSG

ACEPHATE TECHNICAL

FAO Specification 338/TC/S/P (1995)

1.    DESCRIPTION

       The material shall consist of acephate together with related manufacturing impurities and shall be a white crystalline powder with a strong mercaptan-like odour. The material shall be free from visible extraneous matter and added modifying agents.

2.    ACTIVE INGREDIENT

2.1  Identity test

       An identity test is required if the identity of the active ingredient is in doubt.

       Acephate (AOAC-CIPAC method, not yet published)1

       The acephate content shall be declared (not less than 990 g/kg) and, when determined, the content obtained shall not differ from that declared by more than ± 10 g/kg.

3     IMPURITIES

3.1  Methamidophos1

       Maximum: 5.0 g/kg.

3.2  O,O,S-trimethyl phosphorothioate1

       Maximum:  1.0 g/kg.

3.3  Acetamide1

       Maximum: 1.0 g/kg.

3.4  Water (MT. 30, CIPAC F, p.91)

       Maximum: 2 g/kg (Note 1).

4.    PHYSICAL PROPERTIES

4.1  pH range (MT 75, CIPAC F, p.205)

       pH range: 3.4 to 3.6.

4.2  Melting range (MT 2, CIPAC F, p.5)

       Melting range: 88-90°C.

Specification of Acephate EC in GB/T 28157-2011

Specification of Acephate SP in GB/T 28140-2011

ACEPHATE WATER SOLUBLE POWDERS

FAO specification 338/SP/S/P (1995)

1.    DESCRIPTION

       The material shall consist of a homogeneous mixture of technical acephate, complying with the requirements of FAO specification 338/TC/S/P (1995), together with any necessary formulants. It shall be in the form of a powder to be applied as a true solution of the active ingredient after dissolution in water but which may contain insoluble inert ingredients.

2.    ACTIVE INGREDIENT

2.1  Identity test

       An identity test is required if the identity of the active ingredient is in doubt.

2.2  Acephate (AOAC-CIPAC method, not yet published)1

       The acephate content shall be declared (g/kg) and, when determined, the content obtained shall not differ from that declared by more that 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  Methamidophos1

       Maximum: 0.5% of the acephate content found under 2.2.

3.2  O,O,S-trimethyl phosphorothioate1

       Maximum: 0.1% of the acephate content found under 2.2.

3.3  Acetamide

       Maximum: 0.1% of the acephate content found under 2.2.

3.4  Water content (MT 30, CIPAC F, p.91)

       Maximum: 20 g/kg.

3.5  Material insoluble in water (MT10, CIPAC F, p.27)

       Maximum: 220 g/kg.

4.    PHYSICAL PROPERTIES

4.1  pH range (MT 75.2, CIPAC F, p.206)

       pH range: 3.5 to 3.8.

4.2  Wet sieve test (MT 59.3, CIPAC F, p.179)

       Maximum: 2% retained on a 75 µm test sieve.

4.3  Rate of dissolution and solution stability (CIPAC MT 60, CIPAC F, p.182)

       After 5 minutes:       opaque suspension with slight settling of particles (< 1.0 ml) and no large particles observed.

       After 18 hours:         4.5 ml of fine white particulate sediment and 95.5 ml of translucent supernatant containing very fine suspended particles.

4.4  Wetting of the material (MT 53.3.1, CIPAC F, p.164)

       The product shall be completely wetted in less than 1 min without swirling.

5.    STORAGE STABILITY

5.1  Stability at 54°C (MT 46.1.1, CIPAC F, p.149)

       After storage at 54 ± 2°Cfor 14 days, the determined average active ingredient content must not be lower that 97% relative to the determined average content found before storage (Note 1) and the product shall continue to comply with 3.1, 4.1, 4.3 and 4.4.