标准编号：ISO 5667-20:2008
中文名称：水的质量 取样 第20部分：决策用取样数据的使用指南 符合限和分类系统
英文名称：Water quality — Sampling — Part 20: Guidance on the use of sampling data for decision making — Compliance with thresholds and classification systems
发布日期：2008-03
标准范围
This part of ISO 5667 establishes principles, basic requirements, and illustrative methods for dealing with the use of sample data for decision making based on the assessment of the confidence that water quality:a) meets targets and complies with thresholds;b) has changed; and/orc) lies in a particular grade in a classification system.This part of ISO 5667 also specifies methods for preliminary examination of the sensitivity of decisions to errorand uncertainty, although it does not cover the full range of statistical techniques.This part of ISO 5667 provides general advice on decision making related to constraint formulation forexpression of thresholds and targets and the form and scale of sampling programmes.NOTE 1 In the water industry, "standard" is commonly used to indicate the value or limit of a parameter of interestHowever, in this part of ISO 5667, the term "threshold" is used to avoid confusion with published national, regional, andInternational Standards.NOTE 2 This document is framed in terms of sampling and measurement of chemical concentrations, in particularthose subject to strong day-to-day temporal variations. The principles apply, however, to any item estimated by samplingwhich is subject to random error, including microbiological and biological data, and data subject to strong spatial variations.
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