NEN EN ISO 7027 : 2000

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Sampling and samples
5 Semiquantitative methods of turbidity measurement
     5.1 Measurement using the transparency testing
           tube
     5.2 Measurement using the transparency testing
           disk
6 Quantitative methods of turbidity measurement
    using optical turbidimeters
    6.1 General principles
    6.2 Reagents
    6.3 Measurement of diffuse radiation
    6.4 Measurement of attenuated radiation
Annex A (informative) Results of an interlaboratory
        collaborative trial to evaluate the suitability
        of a synthetic polymer for use as a secondary
        standard to formazine in turbidity measurements
Bibliography

Defines four procedures for determining water turbidity.