OIV-MA-AS1-02 General remarks

1. Clear wine or must, must be used for chemical and physical analysis.  If the wine or the must is cloudy, it is first filtered through filter paper in a covered funnel or centrifuged in a closed container.  This operation must be stated on any required documentation.

2. The reference of the method employ

AVANT-PROJET DE RÉSOLUTION

OENO-MICRO 19-662O Et3

DÉNOMBREMENT DES STAPHYLOCOQUES À COAGULASE POSITIVE

L’ASSEMBLÉE GÉNÉRALE,

VU l'article 2, paragraphe iv, de l'Accord du 3 avril 2001 portant création de l’Organisation internationale de la vigne et du vin,

OIV-MA-VI-10 Determination of total ascorbic acid content

Type IV method

1. Introduction

In the wine vinegar industry, the technological use of ascorbic acid is regulated in the various producing and consuming countries. The application of this practice must be controlled and its presence quantified if possible.

OIV-MA-BS-05 Reference method for the determination of real alcoholic strength by volume of spirit drinks of viti-vinicultural origin: Measurement by densimetry using hydrostatic balance

Type II method

OIV-MA-BS-04 Reference method for the determination of real alcoholic strength by volume of spirit drinks of viti-vinicultural origin: measurement by electronic densimetry (based on the resonant frequency oscillation of a sample in an oscillating cell)

Type II method

OIV-MA-BS-03 Reference method for the determination of real alcoholic strength by volume of spirit drinks of viti-vinicultural origin: measurement by pycnometry

Type II method

1. Principle

The alcoholic strength by volume is obtained from the density of the distillate measured by pycnometry.

COEI-2-ZINC Determination of zinc by atomic absorption spectrometry

1. Principle

The zinc is determined directly by atomic absorption spectrometry by flame.

2. Apparatus

Instrumental parameters: (given as an example)

COEI-2-VISCPE Determination of the ability of an enzymatic preparation to interrupt pectic chains by measuring viscosity

1. Principle

Here, it is proposed to measure the quantity of enzyme needed to halve the viscosity of a standard solution with a given pH, temperature and time.

COEI-2-TANTAL Tantalisation of platforms of l’Vov in graphite

1. Preparation of tantalum solution at 6% (m/v) according to the zatka process

Three grammes of tantalum powder are put in a 100 ml Teflon  cylindrical vase.

Add 10 ml of hydrofluoric acid diluted to a half, 3 g of dehydrated oxalic acid and 0.5 ml of hydrogen peroxide at 30 vol.