1.1 本规程涵盖了最适合处理碳氢化合物样品以测定总汞的容器的类型和制备。 1.2 该实践是为汞形态主要为溶解的汞（0）原子、颗粒（例如碳质或矿物细粒和Fe 2. 奥 3. )以及金属汞的悬浮液滴。 1.3 由于各种原因（例如- 液体的等速采样可能导致悬浮液滴的过度或不足收集，以及积聚在管道底部和样品龙头上的密集较大液滴和池中的汞的收集）。严格注意详细程序（第节 7. )以确保收集到具有代表性的样本。 1.4 当根据可接受的程序收集和分析具有代表性的试验部分时，总汞代表样品中的浓度。 1.5 以国际单位制表示的数值应视为标准。本标准中不包括其他计量单位。 1.6 警告- 汞已被美国环保局和许多国家机构指定为可导致中枢神经系统、肾脏和肝脏损伤的危险物质。汞或其蒸气可能对健康有害，对材料具有腐蚀性。处理汞和含汞产品时应注意。有关详细信息，请参阅适用的产品材料安全数据表（MSDS）和美国环保局的网站（http: //www.epa.gov/mmercury/faq.htm）获取更多信息。用户应意识到，在您所在的州销售汞或含汞产品，或两者兼有，可能会受到州法律的禁止。 1.7 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.8 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 本规程适用于液态烃取样，包括原油、冷凝物、炼油工艺中间体和精炼产品。一般来说，这些样品预计含有十亿分之一（10 –9 质量）至百万分之10 –6 质量）范围。 5.2 在汞浓度通常为万亿分之一（10 –12 质量）范围。这些样本通常可以通过使用EPA方法1669“干净的手，脏的手”采样程序中的严格清洁技术来更好地处理。 5.3 本规程不适用于液化样品，因为可能需要特殊容器来放置加压样品。 5.4 这种做法仅适用于在环境条件下保持100%液体的稳定样品。对于减压后失去一些轻烃末端的样品，重要的是要注意，在取样过程中可能会损失元素汞。可以使用将接近工艺条件的不稳定液态烃直接注入汞分析仪的采样模块来解决这个问题。 5.5 基于这一实践，两种测试方法( D7622型 和 D7623型 )可用于基于冷蒸气原子吸收技术测定原油中的汞。 5.6 在一些精制物流和罐内样品中，可能存在游离水。当样品从工艺温度冷却到环境温度时，水饱和的工艺流可以冷凝水。离子汞物种是水溶性的，并且这些水滴随着时间的推移可能含有汞或吸附汞。 5.7 原油生产、运输和精炼过程中汞的存在可能是一个环境和工业卫生问题。

1.1 This practice covers the types of and preparation of containers found most suitable for the handling of hydrocarbon samples for the determination of total mercury. 1.2 This practice was developed for sampling streams where the mercury speciation is predominantly Hg(0) present as a mixture of dissolved Hg(0) atoms, adsorbed Hg(0) on particulates (for example, carbonaceous or mineral fines and Fe 2 O 3 ) and suspended droplets of metallic mercury. 1.3 The presence of suspended droplets of metallic mercury (often called “colloidal” mercury, since the droplet size can be very small) can make obtaining a representative sample very difficult for a variety of reasons (for example, non-isokinetic sampling of the liquid can result in over- or under-collection of suspended droplets and collection of mercury that has accumulated in dense larger drops and pools on the bottom of piping and in sample taps). Pay strict attention to the detailed procedure (Section 7 ) to ensure representative samples are collected. 1.4 When representative test portions are collected and analyzed in accordance with acceptable procedures, the total mercury is representative of concentrations in the sample. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 Warning— Mercury has been designated by EPA and many state agencies as a hazardous material that can cause central nervous system, kidney, and liver damage. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury-containing products. See the applicable product Material Safety Data Sheet (MSDS) for details and EPA’s website (http://www.epa.gov/mercury/faq.htm) for additional information. Users should be aware that selling mercury or mercury-containing products, or both, in your state may be prohibited by state law. 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 ====== 5.1 This practice is intended for use in sampling liquid hydrocarbons including crude oils, condensates, refinery process intermediates, and refined products. Generally these samples are expected to contain mercury from the parts per billion (10 –9 mass) to parts per million (10 –6 mass) range. 5.2 This practice is not intended for use when sampling aqueous systems where the concentrations of mercury are often in the parts per trillion (10 –12 mass) range. These samples are often better addressed by using the rigorously clean techniques from the EPA Method 1669 “clean hands, dirty hands” sampling procedures. 5.3 This practice is not intended for use for liquefied samples, for which special containers may be required for pressurized samples. 5.4 This practice is only suitable for stabilized samples which remain 100 % liquid at ambient conditions. For samples that on depressurization lose some of the light hydrocarbon ends it is important to note that elemental mercury may be lost during sampling. Sampling modules which inject unstabilized liquid hydrocarbons close to process conditions directly to the mercury analyzer can be used to overcome this issue. 5.5 Based on this practice, two Test Methods ( D7622 and D7623 ) are available for determination of mercury in crude oil, based on cold vapor atomic absorption technique. 5.6 In some refined streams and in tank samples free water may be present. Process streams that are water saturated may condense water as the sample cools from process temperature to ambient temperature. Ionic mercury species are water soluble and these water droplets may contain mercury or adsorb mercury over time. 5.7 The presence of mercury during crude oil production, transport, and refining can be an environmental and industrial hygiene concern.