ISO 7027-2:2019
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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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Laboratory
4.1 General
4.2 Measurement using the transparency testing tube
4.2.1 Apparatus
4.2.2 Sampling and samples
4.2.3 Procedure
4.2.4 Expression of results
5 In situ methods (field methods)
5.1 General
5.2 Measurement using the transparency testing disc
5.2.1 Apparatus
5.2.2 Procedure
5.2.3 Expression of results
5.2.4 Estimation of the attenuation coefficient (in the marine environment)
5.3 Determination of visibility by divers
5.3.1 Apparatus
5.3.2 Procedure
5.3.3 Expression of results
6 Test report
Annex A (informative) Devices
Annex B (informative) Interlaboratory field study results
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Laboratory
4.1 General
4.2 Measurement using the transparency testing tube
4.2.1 Apparatus
4.2.2 Sampling and samples
4.2.3 Procedure
4.2.4 Expression of results
5 In situ methods (field methods)
5.1 General
5.2 Measurement using the transparency testing disc
5.2.1 Apparatus
5.2.2 Procedure
5.2.3 Expression of results
5.2.4 Estimation of the attenuation coefficient (in the marine environment)
5.3 Determination of visibility by divers
5.3.1 Apparatus
5.3.2 Procedure
5.3.3 Expression of results
6 Test report
Annex A (informative) Devices
Annex B (informative) Interlaboratory field study results
Bibliography