1.1 本指南涵盖了从地下水监测井采集的地下水样品的现场过滤方法，不包括含有非水相液体（致密非水相液体或轻质非水相液体）的样品。本文所述的现场过滤方法也可应用于从用于其他目的的井中收集的样品。本指南中未描述实验室过滤方法。 1.2 本指南提供了地下水样品现场过滤的可用程序。应在取样活动之前确定特定分析物的样品过滤需求，并根据指南将其记录在特定地点的取样和分析计划中 D5903 应在特定参数的基础上做出决定，同时考虑采样程序的数据质量目标、任何适用的监管机构指南和分析方法要求。 1.3 本指南提供了有组织的信息收集或一系列选项，不建议采取具体行动。本指南不能取代教育或经验，应与专业判断结合使用。并非本指南的所有方面都适用于所有情况。本指南并不代表或取代评判特定专业服务是否充分的护理标准，也不应在不考虑项目的许多独特方面的情况下应用本指南。 本指南标题中的“标准”一词仅表示该指南已通过ASTM共识程序批准。 1.4 单位-- 括号中以国际单位制或英寸磅单位表示的数值应单独视为标准。每个系统中规定的值可能不是完全相等的；因此，每个系统应独立使用。将两个系统的值合并可能导致不符合标准。 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====== 4.1 一口正确设计、安装和开发的地下水监测井，按照实践建造 D5092/D5092米 ，应该有助于收集地下水样本，这些样本可以进行分析，以确定该样本的物理和化学性质。从这些井中采集的需要分析溶解成分的样品应在化学保存前在现场进行过滤，并运至实验室进行分析。

1.1 This guide covers methods for field filtration of groundwater samples collected from groundwater monitoring wells, excluding samples that contain non-aqueous phase liquids (either Dense Non-Aqueous Phase Liquids (DNAPLs) or Light Non-Aqueous Phase Liquids (LNAPLs)). Methods of field filtration described herein could also be applied to samples collected from wells used for other purposes. Laboratory filtration methods are not described in this guide. 1.2 This guide provides procedures available for field filtration of groundwater samples. The need for sample filtration for specific analytes should be defined prior to the sampling event and documented in the site-specific sampling and analysis plan in accordance with Guide D5903 . The decision should be made on a parameter-specific basis with consideration of the data quality objectives of the sampling program, any applicable regulatory agency guidelines, and analytical method requirements. 1.3 This guide offers an organized collection of information or a series of options and does not recommend a specific course of action. This guide cannot replace education or experience and should be used in conjunction with professional judgment. Not all aspects of this guide may be applicable in all circumstances. This guide is not intended to represent or replace the standard of care by which the adequacy of a given professional service to be judged, nor should this guide be applied without consideration of the many unique aspects of a project. The word “Standard” in the title of this guide means only that the guide has been approved through the ASTM consensus process. 1.4 Units— The values stated in either SI Units or inch-pound units given in brackets are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the 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 ====== 4.1 A correctly designed, installed and developed groundwater monitoring well, constructed in accordance with Practice D5092/D5092M , should facilitate collection of samples of groundwater that can be analyzed to determine both the physical and chemical properties of that sample. Samples collected from these wells that require analysis for dissolved constituents should be filtered in the field prior to chemical preservation and shipment to the laboratory for analysis.