ISO 7027-1:2016

ISO 7027-1:2016

June 2016
International standard Current

Water quality - Determination of turbidity - Part 1 : quantitative methods

ISO 7027-1:2016 specifies two quantitative methods using optical turbidimeters or nephelometers for the determination of turbidity of water:a) nephelometry, procedure for measurement of diffuse radiation, applicable to water of low turbidity (for example drinking water);b) turbidimetry, procedure for measurement of the attenuation of a radiant flux, more applicable to highly turbid waters (for example waste waters or other cloudy waters).Turbidities measured according to the first method are presented as nephelometric turbidity units (NTU). The results typically range between <0,05 NTU and 400 NTU. Depending on the instrument design, it can also be applicable to waters of higher turbidity. There is numerical equivalence of the units NTU and formazin nephelometric unit (FNU).Turbidity measured by the second method is expressed in formazin attenuation units (FAU), results typically range between 40 FAU and 4 000 FAU.

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Main informations

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International ISO standards

Publication date

June 2016

Number of pages

9 p.

Reference

ISO 7027-1:2016

ICS Codes

13.060.60   Examination of physical properties of water

Print number

1
Sumary
Water quality - Determination of turbidity - Part 1 : quantitative methods

ISO 7027-1:2016 specifies two quantitative methods using optical turbidimeters or nephelometers for the determination of turbidity of water:

a) nephelometry, procedure for measurement of diffuse radiation, applicable to water of low turbidity (for example drinking water);

b) turbidimetry, procedure for measurement of the attenuation of a radiant flux, more applicable to highly turbid waters (for example waste waters or other cloudy waters).

Turbidities measured according to the first method are presented as nephelometric turbidity units (NTU). The results typically range between <0,05 NTU and 400 NTU. Depending on the instrument design, it can also be applicable to waters of higher turbidity. There is numerical equivalence of the units NTU and formazin nephelometric unit (FNU).

Turbidity measured by the second method is expressed in formazin attenuation units (FAU), results typically range between 40 FAU and 4 000 FAU.

Replaced standards (1)
ISO 7027:1999
December 1999
International standard Cancelled
Water quality - Determination of turbidity

La présente Norme internationale prescrit quatre méthodes de détermination de la turbidité de l'eau.Deux méthodes semi-quantitatives utilisés, par exemple, sur le terrain, sont spécifiées:a) méthode faisant appel à un tube d'évaluation de la transparence (applicable aux eaux pures et aux eaux de faible turbidité);b) méthode faisant appel à un disque d'évaluation de la transparence (applicable notamment aux eaux de surface).Deux méthodes quantitatives faisant appel à des turbidimètres optiques sont spécifiées:c) méthode par mesurage de la lumière diffusée, applicable aux eaux de faible turbidité (par exemple eaux de boisson);La turbidité mesurée selon cette méthode est exprimée en unités néphélométriques formazine (FNU), normalement dans la gamme entre 0 FNU et 40 FNU. Selon les caractéristiques de l'appareillage, elle peut être également utilisée pour des eaux de plus forte turbidité.d) méthode par mesurage de l'atténuation de la lumière incidente, plus appropriée aux eaux de forte turbidité (par exemple eaux résiduaires ou polluées).La turbidité mesurée selon cette méthode est exprimée en unités d'atténuation formazine (FAU), normalement dans la gamme entre 40 FAU et 4 000 FAU.

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