AS 1289.4.3.1:2021 pdf free download.Methods of testing soils for engineering purposes Method 4.3.1: Soil chemical tests – Determination of the pH value of a soil – Electrometric method. AS 1289.4.3.1 covers the electrometric determination of the pH value of a soil-suspension. NOTE The pH value a sample groundwater can be measured in a similar manner to that used for a soil-suspension. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. NOTE Documents referenced for informative purposes are listed in the Bibliography. AS 1289.1.1, Methods of testing soils for engineering purposes, Method 1.1: Preparation of disturbed soil samples for testing ISO 3310-2, Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated metal plate 3 Terms and definitions No terms and definitions are listed in this document. 4 Apparatus The following apparatus are required: (a) pH meter, covering at least the range pH 3.0 to pH 13.0, fitted with a scale that is readable and accurate to 0.05 pH units. NOTE 1 Soils with high p11 values, such as stabilized soils and naturally occurring soils with a pH…