EN ISO 7887:2011

Water quality - Examination and determination of colour (ISO 7887:2011)

Publication date:   May 17, 2012

General information

60.60 Standard published   Dec 15, 2011

CEN

CEN/TC 230 Water analysis

European Norm

13.060.60   Examination of physical properties of water

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Scope

ISO 7887:2011 specifies four different methods, designated A to D, for the examination of colour.
The previously most employed method for assessment of water colour in water treatment plants, limnological surveys, etc. was based on the hexachloroplatinate scale. Methods C and D are harmonized with this traditional procedure.
Method A involves examination of apparent colour by visually observing a water sample in a bottle. This gives only preliminary information, for example for use in field work. Only the apparent colour can be reported.
Method B involves determination of the true colour of a water sample using optical apparatus and is applicable to raw and potable water and to industrial water of low colour. A subclause on interferences is included.
Method C involves determination of the true colour of a water sample using optical apparatus for comparison with hexachloroplatinate concentration at wavelength, λ = 410 nm. A subclause on interferences is included.
Method D involves determination of colour by visual comparison with hexachloroplatinate standard solutions and can be applied to raw and drinking water. A subclause on interferences is included.
Methods A and B are appropriate if the colour hue of the sample differs from the hue of the matching solution.
When stating the result, the procedure used (methods A to D) is also recorded.

Life cycle

PREVIOUSLY

Replaces
EN ISO 7887:1994

NOW

PUBLISHED
EN ISO 7887:2011
60.60 Standard published
Dec 15, 2011