Nicosulfuron TC, WDG, OD

Nicosulfuron TC, WDG, OD

NICOSULFURON TECHNICAL MATERIAL

FAO Specification 709 / TC (January 2022)

This specification, which is PART ONE of this publication, is based on an evaluation of data submitted by the manufacturers whose names are listed in the evaluation reports (709/2005, 709/2010, 709/2013 and 709/2021.1). It should be applicable to relevant products of these manufacturers but it is not an endorsement of those products, nor a guarantee that they comply with the specifications. The specification may not be appropriate for the products of other manufacturers. The evaluation reports (709/2005, 709/2010, 709/2013 and 709/2021.1) as PART TWO form an integral part of this publication.

1 Description

The material shall consist of nicosulfuron together with related manufacturing impurities and shall be a homogeneous white crystalline or powder solid, free from visible extraneous matter and added modifying agents.

2 Active ingredient

2.1 Identity tests (709/TC/M/2, CIPAC Handbook M, p.122, 2009)

The active ingredient shall comply with an identity test and, where the identity remains in doubt, shall comply with at least one additional test.

2.2 Nicosulfuron content (709/TC/M/3, CIPAC Handbook M, p.122, 2009)

The nicosulfuron content shall be declared (not less than 910 g/kg) and, when determined, the average measured content shall not be lower than the declared minimum content.

NICOSULFURON WATER DISPERSIBLE GRANULES

FAO Specification 709 / WG (January 2022)

This specification, which is PART ONE of this publication, is based on an evaluation of data submitted by the manufacturers whose names are listed in the evaluation reports (709/2005 & 709/2021.1). It should be applicable to relevant products of these manufacturers but it is not an endorsement of those products, nor a guarantee that they comply with the specifications. The specification may not be appropriate for the products of other manufacturers. The evaluation reports (709/2005 & 709/2021.1) as PART TWO form an integral part of this publication.

1 Description

The material shall consist of a homogeneous mixture of technical nicosulfuron, complying with the requirements of the FAO specification 709/TC (December 2021), together with carriers and any other necessary formulants. It shall be in the form of granules for application after disintegration and dispersion in water. The formulation shall be dry, free-flowing, essentially non-dusty, and free from visible extraneous matter and hard lumps.

2 Active ingredient

2.1 Identity tests (709/WG/M/2, CIPAC Handbook M, p.125, 2009)

The active ingredient shall comply with an identity test and, where the identity remains in doubt, shall comply with at least one additional test.

2.2 Nicosulfuron content (709/WG/M/3, CIPAC Handbook M, p.125, 2009)

The nicosulfuron content shall be declared (g/kg) and, when determined, the average content measured shall not differ from that declared by more than the following tolerance:

Declared content, g/kg         Tolerance

above 500                              ± 25 g/kg

3 Physical properties

3.1 Wettability (MT 53.3, CIPAC Handbook F, p.165, 1995)

The formulation shall be completely wetted in 20 sec without swirling.

3.2 Wet sieve test (MT 185, CIPAC Handbook K, p.149, 2003)

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

3.3 Degree of dispersion (MT 174, CIPAC Handbook F, p.435, 1995)

Dispersibility: minimum 70% after 1 min stirring.

3.4 Suspensibility (MT 184.1, CIPAC Handbook P, p.245, 2021) (Note 1)

A minimum of 70% shall be in suspension after 30 min in CIPAC standard water D at 30 ± 2°C.

3.5 Persistent foam (MT 47.3, CIPAC Handbook O, p. 177, 2017) (Note 2)

Maximum: 60 ml after 1 min.

3.6 Dustiness (MT 171.1, CIPAC Handbook P, p.235, 2021) (Note 3)

Essentially non-dusty.

3.7 Flowability (MT 172.2, CIPAC Handbook P, p. 241, 2021)

At least 99% of the formulation shall pass through a 5 mm test sieve after 20 drops of the sieve.

4 Storage stability

4.1 Stability at elevated temperature (MT 46.4, CIPAC Handbook P, p. 232, 2021)

After storage at 54  2C for 14 days, the determined average active ingredient content must not be lower that 95% relative to the determined average content found before storage (Note 4) and the formulation shall continue to comply with the clauses for:

- wet sieve test (3.2),

- degree of dispersion (3.3),

- suspensibility (3.4),

- dustiness (3.6),

- flowability (3.7).

NICOSULFURON OIL DISPERSION

FAO specification 709 / OD (January 2022)

This specification, which is PART ONE of this publication, is based on an evaluation of data submitted by the manufacturer whose name is listed in the evaluation reports (709/2013 & 709/2021.1). It should be applicable to relevant products of these manufacturers but it is not an endorsement of those products, nor a guarantee that they comply with the specifications. The specification may not be appropriate for the products of other manufacturers. The evaluation reports (709/2013 & 709/2021.1) as PART TWO form an integral part of this publication.

1 Description

The material shall consist of a stable suspension of fine particles of technical nicosulfuron, complying with the requirements of FAO specification 709 / TC (January 2022), in the form of an off-white viscous liquid, in a non-aqueous fluid together with suitable formulants. After shaking or stirring of the sample, the material shall be homogeneous (Note 1).

2 Active ingredient

2.1 Identity tests (709/OD/M/2, CIPAC Handbook O, p.79, 2017)

The active ingredient shall comply with an identity test and, where the active remains in doubt, shall comply with at least one additional test.

2.2 Nicosulfuron content (709/OD/M/3, CIPAC Handbook O, P.79, 2017)

The nicosulfuron content shall be declared (g/kg or g/l at 20  2°C, Note 2) and, when determined, the content measured shall not differ from that declared by more than the appropriate tolerance, given in the table of tolerance:

Declared content in g/kg or g/l at 20± 2 ºC          Permitted tolerance

above 25 up to 100                                                  ±10% of the declared content

Note: the upper limit is included in each range

3 Physical Properties

3.1 Pourability (MT 148.1, CIPAC Handbook F, p. 348, 1995)

Maximum “residue”: 5%.

3.2 Dispersion Stability (MT 180, CIPAC Handbook H, p. 310, 1998) (Note 3)

The formulation, when diluted at 30  2°C with CIPAC Standard waters A and D, shall comply with the following:

Time after allowing the dispersion to stand               Limits of stability

0 h                                                                                     initial dispersion complete

0.5 h                                                                                  "cream", maximum: trace

"free oil", maximum: trace

"sediment", trace

24 h                                                                                   re-dispersion complete

24.5 h                                                                                "cream", maximum: trace

"free oil", maximum: trace

"sediment", trace

3.3 Wet sieve test (MT 185, CIPAC Handbook K, p.148, 2003) (Note 4)

Maximum: 2% of the formulation shall be retained on a 75 m test sieve.

3.4 Persistent foam (MT 47.3, CIPAC Handbook O, p.177, 2017) (Note 5)

Maximum: 25 ml after 1 min.

4 Storage Stability

4.1 Stability at 0°C (MT 39.3, CIPAC Handbook J, p.126, 2000)

After storage at 0  2°C for 7 days, the formulation shall continue to comply with the clauses for:

- dispersion stability (3.2),

- wet sieve test (3.3),

4.2 Stability at elevated temperature (MT 46.4, CIPAC Handbook P, P. 232, 2021)

After storage at 40  2°C for 8 weeks, the determined average active ingredient content must not be lower than 95 % relative to the determined average content found before storage (Note 6) and the formulation shall continue to comply with the clauses for:

- pourability (3.1),

- dispersion stability (3.2),

- wet sieve test (3.3)