1.1 该比浊法测定范围为5 mg/L至40 mg/L的硫酸根离子（SO 4. −− ). 1.2 该测试方法成功地用于饮用水、地下水和地表水。用户有责任确保该测试方法对未测试基质的水的有效性。 1.3 以前的重量和体积测试方法已经停止。提到 附录X1 获取历史信息。 1.4 以国际单位制表示的值应视为标准值。本标准不包括其他测量单位。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.6 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 硫酸盐的测定很重要，因为据报道，当这种离子在饮用水中的含量超过约250mg/L时，在钠和镁的存在下，它会引起泻药作用（尤其是儿童），并给水带来不良味道。 5.2 试验方法 第4327页 （“抑制离子色谱法测定水中阴离子的试验方法”）。

1.1 This turbidimetric test method covers the determination of sulfate in water in the range from 5 mg/L to 40 mg/L of sulfate ion (SO 4 −− ). 1.2 This test method was used successfully with drinking, ground, and surface waters. It is the user's responsibility to ensure the validity of this test method for waters of untested matrices. 1.3 Former gravimetric and volumetric test methods have been discontinued. Refer to Appendix X1 for historical information. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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. 1.6 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 ====== 5.1 The determination of sulfate is important because it has been reported that when this ion is present in excess of about 250 mg/L in drinking water, it causes a cathartic action (especially in children) in the presence of sodium and magnesium, and gives a bad taste to the water. 5.2 Test Method D4327 (“Test Method of Anions in Water by Suppressed Ion Chromatography”) may be used.