BS 7755-3.11:1995

Committees responsible
National foreword
Method
Section 1. General
1.1 Scope
1.2 Normative references
1.3 Principle
1.4 Applicability and limitations
Section 2. Pretreatment of samples and determination of
           dry matter contents
2.1 Scope
2.2 Determination of dry matter content
2.3 Preparation of soil samples for extraction with
     water in the mass: volume ratio soil; 5 water, or
     for extraction with dilute acid
2.4 Preparation of soil samples for extraction with
     water in the mass: volume ratio of 1 soil: 2 water
Section 3. Extraction of soil with water at a mass:
           volume ratio of 1 soil: 5 water
3.1 Principle
3.2 Preparation of 1: 5 water extract
3.3 Determination of dry matter content
Section 4. Extraction of soil with water at a mass:
           volume ratio of 1 soil: 2 : water
4.1 Principle
4.2 Preparation of 1: 2 water extract
4.3 Determination of dry matter content
Section 5. Extraction of soil with dilute hydrochloric
           acid
5.1 Principle
5.2 Preparation of acid extract
5.3 Determination of dry matter content
Section 6. Determination of sulfate in solution by a
           gravimetric method using barium chloride
6.1 Scope
6.2 Principle
6.3 Reagents
6.4 Apparatus
6.5 Sampling and sample preparation
6.6 Procedure
6.7 Expression of results
6.8 Interferences
6.9 Special cases
6.10 Notes on procedure
Section 7. Precision of method and test report
7.1 Repeatability and reproducibility
7.2 Test report

Applicable to all types of air-dried soils.

This International Standard specifies procedures for the preparation of water and acid extracts of air-dried soils and soil-like materials. The sulfate content of these extracts is determined by a gravimetric method in which barium chloride is added to the water or acid extract and the precipitate of barium sulfate is dried and weighed. The sulfate content is then calculated from the mass of the material used in the analysis and the mass of barium sulfate precipitated.

This International Standard is applicable to all types of air-dried soils, for example pretreated according to ISO 11464.

This International Standard consists of seven sections:

• Section 1: General;
• Section 2: Pretreatment of samples and determination of dry matter contents;
• Section 3: Extraction of soil with water at a mass : volume ratio of 1 soil : 5 water;
• Section 4: Extraction of soil with water at a mass : volume ratio of 1 soil : 2 water;
• Section 5: Extraction of soil with dilute hydrochloric acid;
• Section 6: Determination of sulfate in solution by a gravimetric method using barium chloride;
• Section 7: Precision of method and test report.