COEI-2-SUCSAC Grape sugar: Determination of saccharose by HPLC

1. Principle

The samples diluted or put in solution are analysed by high performance liquid chromatography: Separation on column of grafted silica NH₂ and detection using a differential refractometer.

COEI-2-POTASS Determination of potassium by atomic absorption spectrometry

1. Principle

The potassium is determined by mineralisation by dry process by atomic absorption spectrometry.

The addition of a spectral buffer (cesium chloride) to avoid the ionisation of the potassium is necessary.

COEI-2-PLOMB Determination of lead by atomic absorption spectrometry

1. Principle

After mineralisation of the sample in an acid medium, the lead is determined by spectrometry without flame (electro-thermal atomisation).

COEI-2-NICKEL Determination of nickel by atomic absorption spectrometry

1. Principle

The nickel is directly determined by atomic absorption spectrometry without flame (electro-thermal atomisation).

COEI-2-MINERA Mineralisation methods of samples before determination by atomic absorption spectrometry

1. Mineralisation by dry process

Method applicable for determining the following elements: calcium, magnesium, sodium, iron, copper, zinc.

1.1.    Obtaining cinders

COEI-2-METAUX Search for heavy metals

1. Principle of the method

Heavy metals react with the thiol function to form sulphurs. The coloration that results is compared to a standard.

COEI-2-FER Determination of iron by atomic absorption spectrometry

1. Principle

The iron is determined by atomic absorption spectrophotometry by flame.

2. Apparatus

2.1.    Instrumental parameters: (given as an example)

COEI-2-CUIVRE Determination of copper by atomic absorption spectrometry

1. Principle

The copper is determined by atomic absorption spectrometry by flame by using the method of measured additions.

2. Apparatus

Instrumental parameters: (given as an example)