1.1 这些试验方法涵盖了从细粒土中挤压孔隙水的快速程序，以确定提取孔隙水中存在的可溶性盐的量。 1.2 这些试验方法适用于含水量等于或大于约14%的土壤，例如海洋土壤。Kriukov和Manheim对从土壤中提取孔隙水的程序进行了广泛总结 ( 1. ). 2. 1.3 这些试验方法通常不适用于测定从粗骨料中提取的孔隙水的可溶性盐含量- 细粒土，如干净的沙子和砾石。 1.4 测试方法A提供了使用具有折射率刻度的折射计的程序；试验方法B提供了使用千分之一（ppt）刻度的折射计的程序。 1.5 单位- 以国际单位制表示的数值应视为标准。 1.6 所有观测值和计算值应符合实践中制定的有效数字和舍入准则 D6026 除非被这些试验方法取代。 1.6.1 本标准中用于规定如何收集/记录和计算数据的程序被视为行业标准。 此外，它们代表通常应保留的有效数字。使用的程序不考虑材料变化、获取数据的目的、特殊目的研究或用户目标的任何考虑；通常的做法是增加或减少报告数据的有效位数，以与这些考虑相称。考虑工程数据分析方法中使用的有效数字超出了这些测试方法的范围。 1.7 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.8 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ===意义和用途====== 4.1 可溶性盐含量可用于校正土壤的指数性质，如含水量、孔隙比、比重、饱和度和干密度。 注1: 本标准产生的结果质量取决于执行该标准的人员的能力以及所用设备和设施的适用性。符合执业标准的机构 D3740 通常认为能够胜任和客观的测试/取样/检验等。 本标准的用户应注意遵守惯例 D3740 其本身不能保证可靠的结果。可靠的结果取决于许多因素；实践 D3740 提供了一种评估其中一些因素的方法。

1.1 These test methods cover a rapid procedure for squeezing pore water from fine-grained 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 ). 2 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values shall conform to the guidelines for significant digits and rounding established in Practice D6026 unless superseded by these test methods. 1.6.1 The procedures used to specify how data are collected/recorded and calculated in the standard are regarded as the industry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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== 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. 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 D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.