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ISO 7027-1:2016

Water quality — Determination of turbidity — Part 1: Quantitative methods

Jun 9, 2016

General information

90.93     Sep 23, 2021

ISO

ISO/TC 147/SC 2

International Standard

13.060.60  

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Scope

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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 7027:1999

NOW

PUBLISHED
ISO 7027-1:2016
90.93 Standard confirmed
Sep 23, 2021

National adoptions

SRPS EN ISO 7027-1:2016  
ISS

Water quality - Determination of turbidity - Part 1: Quantitative methods (ISO 7027-1:2016)

60.60   Standard published

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