1.1 该试验方法包括测定含有5个颗粒的样品提取物中的微塑料颗粒尺寸分布、形状表征和数量浓度（颗粒计数） µm和100 微米。光透射通过包含液体介质中的颗粒的流动池。粒子在穿过相机的视野时会产生阴影，从而产生大量图像。然后使用这些图像来测量尺寸、形状和浓度。 1.2 该测试方法被用作微塑料颗粒和纤维聚合物鉴定方法的补充技术——红外显微镜和气相色谱/质谱热解。 1.3 此测试方法要求根据实践收集样本 天8332 并根据实践进行准备 天8333 在使用之前。 1.4 单位 -以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.5 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。 1.6 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 许多微塑料颗粒通过工业过程和消费品产生的废水源进入环境，包括环境水和饮用水供应。高百分比的有机颗粒的存在，包括源自卫生纸的纤维素材料和源自昆虫外骨骼的甲壳素基材料，使得废水中微塑料颗粒的视觉识别和随后的定量变得困难。 5.2 本试验方法，相关取样规程 天8332 ，和准备实践 天8333 为水，特别是废水样品的制备提供了标准化方法。通过实践分离微塑料颗粒与干扰污染物 天8333 能够对微塑料颗粒进行阳性鉴定，从而实现定量。 5.3 使用这种测试方法，对微塑料颗粒的尺寸、形状和数量进行表征，从而可以对给定体积的样品进行后续颗粒计数。该方法不提供塑料成分的定性鉴定。

1.1 This test method covers the determination of microplastic particle size distribution, shape characterization, and number concentration (particle counts) in sample extracts containing particles between 5 µm and 100 µm. Light is transmitted through a flow cell containing particles in liquid medium. The particles create shadows as they pass through the field of vision of a camera, producing a multitude of images. The images are then used to measure size, shape, and concentration. 1.2 This test method is used as a complementary technique for microplastic particle and fiber polymer identification methods infrared microscopy and gas chromatography/mass spectroscopy pyrolysis. 1.3 This test method requires that samples are collected according to Practice D8332 and prepared according to Practice D8333 prior to use. 1.4 Units —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 Many microplastic particles enter the environment, including ambient waters and drinking water supplies, via wastewater sources resulting from both industrial processes and consumer products. The presence of high percentages of organic particles, including cellulose material originating from toilet paper and chitin-based materials originating from insect exoskeletons, makes visual identification and subsequent quantification of microplastic particles in wastewater difficult. 5.2 This test method, associated sampling Practice D8332 , and preparation Practice D8333 provide a standardized approach for the preparation of water and, particularly, wastewater samples. The isolation of microplastic particles from interfering contaminants by Practice D8333 enables positive identification and, therefore, quantification of microplastic particles. 5.3 Using this test method, microplastic particles are characterized in terms of size, shape, and quantity, allowing for the enumeration of subsequent particle count for a given volume of sample. The method does not provide qualitative identification of plastic composition.