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Significance and Use
4.1 The soluble salt content may be used to correct the index properties of soils such as water content, void ratio, specific gravity, degree of saturation, and dry density).
4.2 Minimize the time period between sampling and testing to reduce chemical changes, which may occur within the soil sample.
Note 1: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice does not in itself ensure reliable results. Reliable results depend on many factors; Practice provides a means of evaluating some of those factors.
Note 2: Hulbert and Brindle (and Torrance ) ( have shown that prolonged storage should be avoided as unpredictable and non-reproducible chemical changes may occur. )
1.1 These test methods cover a rapid procedure for squeezing pore water from finegrained soils for the purpose of determining the amount of soluble salts present in the extracted pore water.
1.2 These test methods were developed for soils having a water content equal to or greater than approximately 14 %, for example, marine soils. An extensive summary of procedures for extracting pore water from soils has been presented by Kriukov and Manheim ().
1.3 These test methods are not generally applicable for determining the soluble salt content of the pore water extracted from coarse-grained soils, such as clean sands and gravels.
1.4 Test Method A provides a procedure using a refractometer with a refraction index scale; Test Method B provides a procedure using a refractometer with a parts per thousand (ppt) scale.
1.5 Units—The values stated in SI units are to be regarded as the standard.
1.6 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice unless superseded by these test methods.
1.6.1 The procedures used to specify how data are collected/recorded and calculated in the standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of these test methods to consider significant digits used in analysis methods for engineering data.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
1.8 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice .
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D653 Terminology Relating to Soil, Rock, and Contained Fluids
D3740 Practice for Minimum Requirements for Agencies Engaged in Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction
D6026 Practice for Using Significant Digits in Geotechnical Data
E832 Specification for Laboratory Filter Papers
Federal DocumentGG-S-945a Specification for Syringe and Needle, Disposable, Hypodermic, Sterile, Single Injection Available from Naval Publications and Forms Center, 5801 Tabor Ave., Philadelphia, PA, 19120.
ICS Number Code 13.080.10 (Chemical characteristics of soil)
UNSPSC Code 11111501(Soil); 41113900(Soil measuring equipment)
ASTM D4542-15, Standard Test Methods for Pore Water Extraction and Determination of the Soluble Salt Content of Soils by Refractometer, ASTM International, West Conshohocken, PA, 2015, www.astm.orgBack to Top