Information
Ethephon technical
Ethephon technical concentrate
Ethephon soluble concentrates
2-chloroethylphosphonic acid
AGP:CP/352
COMMON NAME: ethephon (ISO)
STRUCTURAL FORMULA
EMPIRICAL FORMULA: C2H6ClO3P
RMM: 144.5
CAS REGISTRY NUMBER: 16672-87-0
CIPAC CODE NUMBER: 373
CHEMICAL NAMES:
2-chloroethylphosphonic acid (IUPAC)(2-chloroethyl)phosphonic acid (CA)
FAO Specification 373/TC/S/F (1997)
1. DESCRIPTION
The material shall consist of ethephon together with related manufacturing impurities and shall be a greyish-white coloured, waxy solid free from visible extraneous matter and added modifying agents.
2. ACTIVE INGREDIENT
2.1 Identity tests (Note 1)An identity test is required if the identity of the active ingredient is in doubt (e.g. gas chromatographic retention time under analytical conditions described in the analysis of mono 2-chloroethyl ester, 2-chloroethyl phosphonic acid: MEPHA).
2.2 Ethephon (373/TC/M/2, CIPAC H, to be published) (Note 1)
The ethephon content shall be declared (not less than 910 g/kg) and, when determined,. the content obtained shall not differ from that declared by more than ± 25 g/kg.
3. IMPURITIES
3.1 Manufacturing impurities (Note 1)MEPHA: mono 2-chloroethyl ester, 2-chloroethyl phosphonic acid: Maximum 20 g/kg.
1,2-dichloroethane: Maximum 0.5 g/kg.
4. PHYSICAL PROPERTIES
4.1 pH range (MT 75, CIPAC F, p. 205)pH range: 1.5 to 2.0.
NOTE 1. Methods available from the Pesticides Information Officer, FAO Plant Production and Protection Division.
FAO Specification 373/TK/S/F (199.7)
1. DESCRIPTION
The material shall consist of an aqueous solution of ethephon, complying with the requirements of FAO specification 373/TC/S/F (1997), together with related manufacturing impurities and shall be a colourless to tan liquid free from visible extraneous matter and added modifying agents.
2. ACTIVE INGREDIENT
2.1 Identity tests (Note 1)An identity test is required if the identity of the active ingredient is in doubt (e.g. gas chromatographic retention time under analytical conditions described in the analysis of mono 2-chloroethyl ester, 2-chloroethyl phosphonic acid: MEPHA).
2.2 Ethephon (373/TK/M/2, CIPAC H, to be published) (Note 1)
The ethephon 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 |
|
above 250 g/kg 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)MEPHA: mono 2-chloroethyl ester, 2-chloroethyl phosphonic acid: Maximum 2% of the ethephon content found under 2.2.
1,2-dichloroethane: Maximum 0.05 % of the ethephon content found under 2.2.
3.2 Material insoluble in water (MT 10.3 B, CIPAC F, p. 29)
The product shall pass through a 250 m m test sieve and not more than 1 g/kg shall remain on a 150 m m test sieve.
4. PHYSICAL PROPERTIES
4.1 pH range (MT 75, CIPAC F, p. 205)pH range: 1.5 to 2.0.
NOTE 1. Methods available from the Pesticides Information Officer, FAO Plant Production and Protection Division.
FAO Specification 373/SL/S/F (1997)
1. DESCRIPTION
The material shall consist of a solution of technical ethephon, complying with the requirements of FAO specification 373/TC/S/F (1997), dissolved in suitable solvents and with other necessary added formulants. It shall be a clear or opalescent colourless to tan liquid, free from visible suspended matter and sediment (Note 1).
2. ACTIVE INGREDIENT
2.1 Identity tests (Note 2)An identity test is required if the identity of the active ingredient is in doubt (e.g. gas chromatographic retention time under analytical conditions described in the analysis of mono 2-chloroethyl ester, 2-chloroethyl phosphonic acid: MEPHA).
2.2 Ethephon (373/SL/M/2, CIPAC H, to be published) (Note 2)
The ethephon content shall be declared (g/kg or 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 250 g/kg |
± 6 % of the declared content |
|
above 250 g/kg up to 500 g/kg |
± 5 % of the declared content |
|
above 500 g/kg |
± 25 g/kg |
3. IMPURITIES
3.1 Manufacturing impurities (Note 2)MEPHA: mono 2-chloroethyl ester, 2-chloroethyl phosphonic acid: Maximum 2 % of the ethephon content found under 2.2.
1,2-dichloroethane: Maximum 0.05 % of the ethephon content found under 2.2.
4. PHYSICAL PROPERTIES
4.1 pH range (MT 75, CIPAC F, p. 205)pH range: 1.5 to 2.0.
4.2 Stability of dilution (MT 41, CIPAC F, p. 131)
The product after dilution with CIPAC Standard Water D shall give a clear or opalescent solution at 20°C. After standing for one hour, any visible particles should pass through a 75 m m test sieve.
5. STORAGE STABILITY
5.1 Stability at 0°C (MT 39, CIPAC F, p. 128)After storage at 0°C ± 1°C for 7 days, the volume of solid and/or liquid which separates shall not be more than 0.3 ml.
5.2 Stability at 54°C (MT 46.1.3, CIPAC F, p. 150)
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 4) and the product shall continue to comply with 4.1 and 4.2.
NOTES
1. Some products content opalescent additives for commercial identification.2. Methods available from the Pesticides Information Officer, FAO Plant Production and Protection Division.
3. If the buyer requires both g/kg and g/l at 20°C then, in the case of dispute, the analytical results shall be calculated as g/kg.
4. Analysis of the product before and after storage stability test should be carried out at the same time (i.e. after storage) to reduce the analytical error.
