1.1 本指南描述了收集明渠中水流的温度、溶解氧（DO）、电导率（SC）和pH值的横截面方法的程序。 1.2 本指南提供了准备和校准设备的指南，以收集明渠中流动水的温度、溶解氧、悬浮物和pH值的横截面平均值。 1.3 本指南描述了应使用哪些设备来收集明渠中流动水的温度、溶解氧、悬浮物和pH值的横截面平均值。 1.4 本指南涵盖了明渠中流动淡水的温度、DO、SC和pH值的横截面方法。 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）。本标准的用户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（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本指南描述了记录温度、溶解氧、悬浮物和pH的现场测量的稳定标准。 5.2 本指南描述了用于校准和检查现场仪表以记录这些测量值的程序，以及现场用于获取这些数据的程序。 5.3 本指南描述了在获得明渠中流动水的温度、溶解氧、悬浮物和pH值的横截面平均值时应遵循的质量保证程序。 5.4 现场测量必须准确表示被测量明渠中的水流。需要使用能够准确表示感兴趣参数平均值的方法。必须使用考虑到跨截面和随深度变化的参数变化的程序。 5.5 必须直接在明渠中的水中测量温度和溶解氧。SC和pH值通常在现场测量，但也可以在使用放电加权方法收集的复合样品的子样品中测量。

1.1 This guide describes procedures to collect cross-sectional means of temperature, dissolved oxygen (DO), specific electrical conductance (SC), and pH of water flowing in open channels. 1.2 This guide provides guidelines for preparation and calibration of the equipment to collect cross-sectional means of temperature, DO, SC, and pH of water flowing in open channels. 1.3 This guide describes what equipment should be used to collect cross-sectional means of temperature, DO, SC, and pH of water flowing in open channels. 1.4 This guide covers the cross-sectional means of temperature, DO, SC, and pH of fresh water flowing in open channels. 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 This guide describes stabilization criteria for recording field measurements of temperature, DO, SC, and pH. 5.2 This guide describes the procedures used to calibrate and check meters to be used in the field to records these measurements and the procedures to be use in the field to obtain these data. 5.3 This guide describes quality assurance procedures to be followed when obtaining cross-sectional means of temperature, DO, SC, and pH of water flowing in open channels. 5.4 Field measurement must accurately represent the water flowing in the open channel being measured. Methods need to be used that will result in an accurate representation of the mean of the parameter of interest. Procedures must be used that will take into consideration the variation in the parameter across the sections and with depth. 5.5 Temperature and DO must be measured directly in the water in the open channel. SC and pH are often measured in situ, but also may be measured in a subsample of a composite sample collected using discharge-weighted methods.