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DIN Standards Committee Building and Civil Engineering

Abstract

The aim of this standard is to describe a test for the determination of water-soluble sulphate content in a soil sample (SO3), by initial dissolution in demineralized water and subsequent precipitation with a saturated BaCl2 solution, according to the following reaction: 𝑀𝑆𝑂4+ 𝐵𝑎𝐶𝑙2 (𝑠𝑎𝑡.) →𝐵𝑎𝑆𝑂4+ 𝑀𝐶𝑙2 The presence of large bivalent anions in soils, such as sulfuric or phosphoric acids, phosphates, or oxalates, could interferes with the method, since they also precipitate with the added BaCl2 solution, thereby undergoing a mass gain in the residue obtained and contributing to an underestimation of the water-soluble sulphate content. Carbonates are the exception, as they are previously removed as CO2 (g) by addition of hydrochloric acid. A qualitative method is given in Annex B for quick and easy recognition of the presence of water-soluble sulphates in a soil by their initial dissolution in water and subsequent precipitation with BaCl2. A further quantitative method for obtaining the content of gypsum (CaSO4 2H2O) in a soil sample from the non-gypsum water-soluble sulphates content determined by this method is given in Annex C. The results obtained with this standard do not include all the sulphate present in the soil, only those that are dissolved in water by the conditions set in this standard. These results are not comparable with those obtained by Technical Specification TS 17685-5:202x (soluble salts in soils).

Begin

2025-08-05

WI

00396026

Planned document number

00396026

Responsible national committee

NA 005-05-22 AA - Earthworks (national mirror committee for CEN/TC 396), Joint committee with FGSV  

Responsible european committee

CEN/TC 396/WG 8 - Test methods