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ISO 7027

3rd Edition, December 15, 1999

Complete Document

Water Quality - Determination of Turbidity

Includes all amendments and changes through Change/Amendment , December 15, 1999


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Superseded By: ISO 7027-1

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ENGLISH * W/D S/S BY ISO 7027-1 & 7027-2
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Description / Abstract:

This International Standard specifies four methods for the determination of turbidity of water.

Two semiquantitative methods, employed for example in field work, are specified:

a) measurement of turbidity using the transparency testing tube (applicable to pure and lightly polluted water);

b) measurement of turbidity using the transparency testing disk (especially applicable to surface water).

Two quantitative methods, using optical turbidimeters, are specified:

c) measurement of diffuse radiation, applicable to water of low turbidity (for example drinking water); Turbidity measured by this method is expressed in formazin nephelometric units (FNU); results typically range between 0 FNU and 40 FNU. Depending on the instrument design, it may also be applicable to waters of higher turbidity.

d) measurement of the attenuation of a radiant flux, more applicable to highly turbid waters (for example waste or polluted waters).

Turbidity measured by this method is expressed in formazin attenuation units (FAU); results typically range between 40 FAU and 4000 FAU.
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