ISO 10390:2021
Soil, treated biowaste and sludge – Determination of pH
This document specifies an instrumental method for the routine determination of pH within the range pH 2 to pH 12 using a glass electrode in a 1:5 (volume fraction) suspension of soil, sludge and treated biowaste in either water (pH in H2O), in 1 mol/l potassium chloride solution (pH in KCl) or in 0,01 mol/l calcium chloride solution (pH in CaCl2).
This document is applicable to all types of air-dried soil and treated biowaste samples.
NOTE For example, pretreated in accordance with ISO 11464 or EN 16179 or EN 15002.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Laboratory sample
8 Procedure
8.1 Preparation of the suspension
8.2 Calibration of the pH-meter
8.3 Measurement of the pH
9 Precision
10 Test report
Annex A (informative) Repeatability and reproducibility data
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Laboratory sample
8 Procedure
8.1 Preparation of the suspension
8.2 Calibration of the pH-meter
8.3 Measurement of the pH
9 Precision
10 Test report
Annex A (informative) Repeatability and reproducibility data
Bibliography