EN ISO 7027-1:2016

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

Publication date:   Aug 16, 2016

General information

60.60 Standard published   Jun 29, 2016


CEN/TC 230 Water analysis

European Norm

13.060.60   Examination of physical properties of water



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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


EN ISO 7027:1999


EN ISO 7027-1:2016
60.60 Standard published
Jun 29, 2016