1.1本规程适用于在水中提供化学和物理测量的所有实验室，并提供实验室内控制指南和报告低水平数据的建议程序。 1.2本规程的使用基于以下假设:所使用的分析方法适用于任务，基本无偏差或偏差已知，能够进入统计控制状态，并且具有足够的灵敏度来确定感兴趣水平的分析物。 1.3此外，假设现场操作的质量保证程序，如样品收集、容器选择、保存、运输和储存是适当的。 1.4本实践还基于实验室已经建立了质量控制系统，并开发了适当的报告系统，以证明实验室的性能。

1.1 This practice is applicable to all laboratories that provide chemical and physical measurements in water, and provides guidelines for intralaboratory control and suggested procedures for reporting low-level data. 1.2 The use of this practice is based on the assumptions that the analytical method used is appropriate for the task, is either essentially bias-free or the bias is known, is capable of being brought into a state of statistical control, and possesses adequate sensitivity to determine the analytes at the levels of interest. 1.3 Further, it is assumed that quality assurance procedures for field operations such as sample collection, container selection, preservation, transportation, and storage are proper. 1.4 This practice is also predicated upon the laboratory already having established a quality control system with development of an adequate reporting system such that the laboratory's performance can be substantiated.