Norm

NEN-EN 1233:1994 Ontw. en

Water - Bepaling van het gehalte aan chroom met behulp van atomaire-absorptiespectrometrische methoden

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Over deze norm

Status Ingetrokken
Aantal pagina's 14
Commissie Anorganische parameters
Gepubliceerd op 01-01-1994
Taal Engels
This standard specifies two methods for the determination of chromium in water by atomic absorption spectrometry. The two methods are covered in separate sections as follows. Section 2: Method A - Determination of chromium by flame atomic absorption spectrometry. Section 3: Method B - Determination of chromium by electrothermal atomization atomic absorption spectrometry. Method A is applicable to the analysis of water and waste water when the concentration range is between 0,5 µg/l and 20 µg/l of chromium. When the concentration is below 0,5 µg/l the determination can be carried out after carefully evaporating an acidified sample to small volume, taking care to avoid the formation of a precipitate. Method B is applicable to the analysis of water and waste water when the concentration range is between 5 µg/l and 100 µg/l of chromium by injecting a sample volume of 20 µg/l. It is applicable to the determination of higher concentrations by using a smaller sample volume. Chromium may occur in water in the oxidation states III and VI. The two methods described determine total chromium, in both oxidation states, either as chromium or as soluble chromium, depending on the sample pre-treatment. The method chosen depends on the concentration of chromium in the water to be examined.

Details

ICS-code 13.060.50
Nederlandse titel Water - Bepaling van het gehalte aan chroom met behulp van atomaire-absorptiespectrometrische methoden
Engelse titel Water quality - Determination of chromium - Atomic absorption spectrometric methods
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