EN ISO 7027:1999

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
Annex ZA (normative) Normative references to international
         publications with their relevant European publications
Bibliography

Defines four procedures for determining water turbidity.