Determination of carbon-14 content by liquid scintillation spectrometry (Type IV)
OIV-MA-BS-24 Determination of 14C content in ethanol
Type IV method
Introduction
Since alcohol can be used for the development of certain alcoholic beverages it is necessary to verify its agricultural or fossil origin.
UV absorption of rectified alcohols of vitivinicultural origin (Type IV)
OIV-MA-BS-21 Absorbance test in UV light of neutral alcohol
Type IV method
- Purpose and scope
This method can be used to determine the optical permeability of neutral alcohol liable to enter into the composition of certain alcoholic beverages.
Lead (Type IV)
OIV-MA-BS-32 Lead- Determination by atomic absorption
Type IV method
- Principle of the method
Lead is determined directly in the alcoholic beverage, using a lead hollow-cathode lamp by flameless atomic absorption spectrometry, using a matrix modifier.
Determination of iron by atomic absorption (Type IV)
OIV-MA-BS-31 Iron- Determination by atomic absorption
Type IV method
- Principle
Iron is determined by atomic absorption spectrophotometry by means of an oxidising air-acetylene flame, using an iron hollow-cathode lamp, at a wavelength of 248.3 nm on the alcoholised alcoholic beverage.
Copper (Type IV)
OIV-MA-BS-30 Copper- Determination by atomic absorption
Type IV method
- Principle
Copper content is determined by atomic absorption spectrophotometry by means of an oxidizing acetylene air flame using a copper hollow-cathode lamp, at wavelength 324.7 nm, on the dealcoholised alcoholic beverage, according the so-called "standard addition" method.
Calcium (Type IV)
OIV-MA-BS-29 Calcium- Determination by atomic absorption
Type IV method
Turbidity (Type IV)
OIV-MA-BS-28 Measurement of turbidity by nephelometry
Type IV method
- Purpose
The purpose of the present document is to describe an optical method for determining the turbidity index (or diffusion index) of an alcohol or alcoholic beverage.
Chromatic characteristics (Type IV)
OIV-MA-BS-27 Determination of chromatic characteristics
Type IV method
Colour intensity (Type IV)
OIV-MA-BS-26 Measurement of colour intensity
Type IV method
- Principle
Colour intensity is determined by measuring the absorbance at 445 nm for an optical length of 1 cm thick (for traditional alcoholic beverages).
Determination of ethyl carbamate (Type IV)
OIV-MA-BS-25 Determination of ethyl carbamate
Type IV method
- Principle
The assay is performed by direct injection of the drink into a chromatograph coupled to a mass spectrometer operating under the principle of electron impact, in "Selected Ion Monitoring (SIM)” acquisition mode.