Diflufenican technical

FAO Specification 462/TC/S/F (1997)

1. DESCRIPTION

The material shall consist of diflufenican together with related manufacturing impurities and shall be a brown damp crystalline powder free from visible extraneous matter and added modifying agents.

2. ACTIVE INGREDIENT

2.1 Identity tests (462/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 Diflufenican (462/TC/M/3, CIPAC H, to be published) (Note 1)

The diflufenican content shall be declared (not less than 970 g/kg expressed on the dry weight basis) and, when determined, the content obtained shall not differ from that declared by more than ± 25 g/kg.

3. IMPURITIES

3.1 Water (MT 30.2, CIPAC F, p. 93)

Maximum: 100 g/kg.

4. PHYSICAL PROPERTIES

4.1 Melting point (MT 2 on the dried material, CIPAC F, p. 5)

The melting point shall be in the range 159-160°C and shall not be depressed on admixture with an equal quantity of pure diflufenican.

4.2 pH range (MT 75, CIPAC F, p. 205)

pH range: 5.0 to 7.0.

NOTE 1. Methods available from the Pesticides Information Officer, FAO Plant Production and Protection Division.