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BS ISO 5667-20:2008
Current
The latest, up-to-date edition.
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Water quality. Sampling Guidance on the use of sampling data for decision making. Compliance with thresholds and classification systems
Hardcopy , PDF
English
30-04-2008
Foreword
Introduction
1 Scope
2 Summary of key points
3 Types of error and variation
3.1 General
3.2 Analytical error
3.3 Overall uncertainty
4 Activities
4.1 Estimation of summary statistics
4.2 Thresholds for water quality and compliance
4.3 Confidence of failure
4.4 Methods for thresholds expressed as percentiles
4.5 Non-parametric methods
4.6 Look-up tables
5 Definition of thresholds
5.1 General
5.2 Ideal thresholds
5.3 Absolute limits
5.4 Percentage of failed samples
5.5 Calculating limits for effluent discharges
6 Declaring that a substance has been detected
7 Detecting change
8 Classification
8.1 General
8.2 Confidence that class has changed
Annex A (informative) Calculation of confidence limits
Annex B (informative) Calculation for the binomial distribution
Annex C (informative) Sample results with high error or reported
as less than a limit of detection
Bibliography
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