Heavy metals by ETAAS (Type-IV)
OIV-MA-F1-10 Specific methods for the analysis of grape sugar
Type IV method
Annex D: Heavy metals
D.1 Determination of lead level by ETAAS
Heavy metals are described in detail in the steps for preparing grape sugar samples (concentrated musts and MCR rectified concentrated musts) for determining lead content.
Total cations (Type-I)
OIV-MA-F1-09 Specific methods for the analysis of grape sugar
Type I method
ANNEX A: TOTAL CATIONS
Chromatic properties (Type-IV)
OIV-MA-F1-08 Chromatic properties
Type IV method
- Principle of the method
The absorbance of the rectified concentrated must is measured at 425 nm through a pathlength of 1 cm after dilution to bring the sugar concentration to 25 % (m/m) (25° Brix)
Sulphur dioxide (Type-IV)
OIV-MA-F1-07 Sulphur dioxide
Type IV method
pH (Type-IV)
OIV-MA-F1-06 pH
Type IV method
Total acidity (Type-IV)
OIV-MA-F1-05 Total acidity
Type IV method
- Definition
The total acidity of the rectified concentrated must is the sum of its titrable acidities when it is titrated to pH 7 against a standard alkaline solution.
Carbon dioxide is not included in the total acidity.
Sucrose by high-performance liquid chromatography (Type-IV)
OIV-MA-F1-04 Sucrose by High-Performance Liquid Chromatography
Type IV method
Determination of the acquired alcoholic strength by volume (ASV) of concentrated musts (CM) and grape sugar (or rectified concentrated musts, RCM) (Oeno 419A-2011) (Type-IV)
OIV-MA-F1-03 Determination of the acquired alcoholic strength by volume (ASV) of concentrated musts (CM) and grape sugar (or rectified concentrated musts, RCM)
Type IV method
Hydroxymethylfurfural (HMF) by High-Performance Liquid Chromatography (Type-IV)
OIV-MA-F1-02 Hydroxymethylfurfural (HMF) by High-Performance Liquid Chromatography
Type IV method
- Principle of the Method
High-performance liquid chromatography (HPLC)
Separation through a column by reversed-phase chromatography and determination at 280 nm.
Conductivity (Type-IV)
OIV-MA-F1-01 Conductivity
Type IV method
- Principle
The electrical conductivity of a column of liquid defined by two parallel platinum electrodes at its ends is measured by incorporating it in one arm of a Wheatstone bridge.
The conductivity varies with temperature and it is therefore expressed at 20°C.