AASHTO T 290

Abstract

This test method covers the determination of the water-soluble sulfate ion content in soil. This standard is divided into two parts. The first part specifies the procedure for sampling and preparing the sample to size for testing. The second part delineates two test procedures (Methods A or B) for the determination of the sulfate ion content in soils. The selection of the method is dependent on the concentration of sulfate ion and the accuracy desired. <br>Method A is a primary measure of sulfate ion. Method B is less time-consuming, but often more liable to interference than Method A. It is particularly useful in the lower sulfate range and can be used as a screening test. This method is directly applicable over the range of 10 to 100 mg/kg. <br>The values stated in SI units are to be regarded as the standard.