1.1 这些试验方法包括测定硫样品中的溶剂不溶性物质。可用的两种测试方法是:( 1. )试验方法A，二硫化碳萃取，和( 2. )试验方法B，甲苯萃取。如果硫中不存在其他溶剂不溶性物质，这些试验方法直接测定不溶性硫含量。如果还存在其他材料，则需要进行额外测试，以确定不溶物的哪部分是不溶性硫。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 本标准并非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制定适当的安全、健康和环境实践，并确定监管限制的适用性。 有关特定警告，请参阅 5.1 . 1.4 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====== 3.1 由于二硫化碳的溶剂效率，测试方法A通常用于质量控制测试。试验方法B使用甲苯作为溶剂，因为其毒性和挥发性低于二硫化碳。试验方法B更可能用于研究和开发或任何其他可能有用的目的。

1.1 These test methods cover the determination of solvent insoluble materials in a sulfur sample. The two test methods available are: ( 1 ) Test Method A, Extraction by Carbon Disulfide, and ( 2 ) Test Method B, Extraction by Toluene. If there are no other solvent insoluble materials present in the sulfur, these test methods determine the insoluble sulfur content directly. If other materials are also present, additional testing is necessary to identify what portion of the insolubles is insoluble sulfur. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. For a specific warning, see 5.1 . 1.4 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 ====== 3.1 Test Method A is commonly used for quality control testing because of the solvent efficiency of carbon disulfide. Test Method B employs toluene as a solvent because it is less toxic and less volatile than carbon disulfide. Test Method B is more likely to be used for research and development or for any other purpose where such information may be useful.