NF EN ISO 7027-2

NF EN ISO 7027-2

February 2019
Standard Current

Water quality - Determination of turbidity - Part 2 : semi-quantitative methods for the assessment of transparency of waters

This document specifies the following semi-quantitative methods for the assessment of transparency of waters:a) measurement of visual range using the transparency testing tube (applicable to transparent and slightly cloudy water), see Clause 4;b) measurement of visual range in the upper water layers using the transparency testing disc (especially applicable to surface, bathing water, waste water and often used in marine monitoring), see 5.1;c) measurement of visibility by divers in a destined depth, see 5.2.NOTE The quantitative methods using optical turbidimeters or nephelometers are described in ISO 7027-1.

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Main informations

Collections

National standards and national normative documents

Publication date

February 2019

Number of pages

22 p.

Reference

NF EN ISO 7027-2

ICS Codes

13.060.60   Examination of physical properties of water

Classification index

T90-033-2

Print number

1

International kinship

ISO 2027-2:2019

European kinship

EN ISO 2027-2:2019
Sumary
Water quality - Determination of turbidity - Part 2 : semi-quantitative methods for the assessment of transparency of waters

This document specifies the following semi-quantitative methods for the assessment of transparency of waters:

a) measurement of visual range using the transparency testing tube (applicable to transparent and slightly cloudy water), see Clause 4;

b) measurement of visual range in the upper water layers using the transparency testing disc (especially applicable to surface, bathing water, waste water and often used in marine monitoring), see 5.1;

c) measurement of visibility by divers in a destined depth, see 5.2.

NOTE The quantitative methods using optical turbidimeters or nephelometers are described in ISO 7027-1.

Replaced standards (1)
NF EN ISO 7027
March 2000
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.

Table of contents
  • Avant-propos
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions
  • 4 Laboratoire
  • 5 Méthodes in situ (méthodes sur le terrain)
  • 6 Rapport d'essai
  • Annexe A (informative) Dispositifs
  • Annexe B (informative) Résultats d'une étude interlaboratoires sur le terrain
  • Bibliographie
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