1.1 本规程描述了用普通聚合物颗粒制造微塑料颗粒的制造方法，以及用于校准和熟练评估微塑料收集规程、制备规程和鉴定方法的微塑料参考样品的制备。 1.2 该实践没有描述用于控制或表征颗粒形状的方法。已经观察到这些程序产生了不规则形状的颗粒，在许多情况下，使用这些颗粒将有助于消除使用独特制造的球形珠所固有的分析偏差。如果需要球体或细长纤维，则应使用其他程序。 1.3 本规程未说明执行本文所述程序时产生的废物的处理程序。这种做法的使用者有责任在制造和处理微塑料颗粒时遵守适用的法律法规，并制定适当的程序，最大限度地减少产生的废物量。 1.4 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。 1.5 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 这些程序可用于生成微塑料颗粒，以模拟在自然环境中发现的微塑料颗粒。 合适的用途可以包括对微塑料检测和成像方法的评估。参考样本的使用将支持在食品安全和人类健康风险评估的背景下，估计饮用水、废水和自然环境中的环境和通量浓度，调查微塑料颗粒降解，以及动物摄入微塑料。

1.1 This practice describes manufacturing methods to create microplastic particles from pellets of common polymers and the preparation of microplastic reference samples for calibration and proficiency evaluation of microplastic collection practices, preparation practices, and identification methods. 1.2 This practice does not describe methods for controlling or characterizing the shapes of particles. The procedures have been observed to yield irregularly shaped particles, the use of which in many cases will serve to remove the analytical bias inherent with using distinctive manufactured spherical beads. Other procedures should be used if spheres or elongated fibers are desired. 1.3 This practice does not describe handling procedures for waste generated when executing the procedures described herein. It is the responsibility of the user of this practice to follow applicable laws and regulations when manufacturing and disposing of microplastic particles, and to establish appropriate procedures to minimize the amount of waste generated. 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 These procedures can be used to generate microplastic particles as a simulation of microplastic particles found in the natural environment. Suitable uses may include evaluation of microplastic detection and imaging methods. Use of reference samples will support estimation of ambient and flux concentrations in drinking water, wastewater and natural environments, investigations of microplastic particle degradation, and ingestion of microplastics by animals in the contexts of food safety and human health risk assessment.