Magnesium (Type-II)
OIV-MA-AS322-07 Magnesium
Type II method
- Principle
Magnesium is determined directly on diluted wine by atomic absorption spectrophotometry.
Copper (Type-II)
OIV-MA-AS322-06 Copper
Type IV method
- Principle
The method is based on the use of atomic absorption spectrophotometry.
- Apparatus
Iron (colorimetry) (Type-IV)
OIV-MA-AS322-05B Iron
Type IV method
- Principle
After digestion in hydrogen peroxide, 30%, the total iron, present as Fe (III) state, is reduced to the Fe (II) and quantified by the formation of a colored orthophenanthroline complex.
Iron (AAS) (Type-IV)
OIV-MA-AS322-05A Iron
Type IV method
- Principle
After suitable dilution of the wine and removal of alcohol, iron is determined directly by atomic absorption spectrophotometry.
Calcium (Type-II)
OIV-MA-AS322-04 Calcium
Type II method
- Principle
Calcium is determined directly on diluted wine by atomic absorption spectrophotometry after the addition of an ionization suppression agent.
Sodium (flame photometry) (Type-III)
OIV-MA-AS322-03B Sodium
Type III method
- Principle
Sodium is determined directly in diluted wine (at least 1 mL:10 mL) by flame photometry.
Sodium (AAS) (Type-II)
OIV-MA-AS322-03A Sodium
Type II method
- Principle
Sodium is determined directly in the wine by atomic absorption spectrophotometry after the addition of cesium chloride to suppress ionization of sodium.
Potassium (flame photometry) (Type-III)
OIV-MA-AS322-02B Potassium
Type III method
- Principle
Potassium is determined directly in diluted wine by flame photometry.
Potassium (AAS) (Type-II)
OIV-MA-AS322-02A Potassium
Type II method
- Principle
Potassium is determined directly in diluted wine by atomic absorption spectrophotometry after the addition of cesium chloride to suppress ionization of potassium.
Ammonium (Type-IV)
OIV-MA-AS322-01 Ammonium
Type IV method
- Principle
Retention of the ammonium cation on a weak cation exchange resin, elution using an acidic solution, distillation of the eluent and determination of the ammonia in the distillate by titration with a standardized solution of hydrochloric acid.