NF EN 12176 : 1998

Foreword
0 Introduction
1 Scope
2 Normative references
3 Definitions
    3.1 pH value
    3.2 Standard buffer solutions
4 Principle
5 Interferences
6 Hazards
7 Reagents
8 Apparatus
9 Preparation of samples
    9.1 Sample preservation
    9.2 Preparation of liquid sludge samples
    9.3 Preparation of paste-like and solid sludges
10 Measurement of pH-value
    10.1 pH meter set up and standardization
    10.2 Measurements
11 Expression of results
12 Test report
Annex A (normative) primary pH-standard reference solutions
(according to ISO 10523)
Annex B (informative) Bibliographical references

Covers the sludges, i.e. and sludges products from storm water handling, night soil, urban wastewater collecting systems, urban wastewater treatment plants, treating of industrial wastewater similar to urban waste water, water supply treatment plants, and water distribution systems. Does not include hazardous sludges from industry. Applies to determination of pH values of sludges, including liquid, paste-like or solid matter.