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

The scope of this standard is the sludges, i.e. and sludges products from: - storm water handling; - night soil; - urban wastewater collecting systems; - urban wastewater treatment plants; - treating industrial wastewater similar to urban wastewater (as defined in Directive 91/271 EEC); - water supply treatment plants; - water distribution systems; - but excluding hazardous sludges from industry.