ISO 8466-1:2021
Water quality — Calibration and evaluation of analytical methods — Part 1: Linear calibration function
This document specifies various calibration strategies for physicochemical and chemical analytical methods and specifies the calculation of analytical results.
It defines the general context for linear calibration so that individual standards dealing with analytical methods for the examination of water quality can make reference to it.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Determination of the linear working range and establishment of the calibration range
5.1 General
5.2 Preliminary choice of working range
5.3 Estimation of the linear working range
5.3.1 General
5.3.2 Visual testing of measurement data — Testing using the x/y-diagram
5.3.3 Estimation of the linear range by calculating the point-to-point slope
6 Calibration strategies
6.1 General
6.2 Calculation of the calibration function
6.3 Calibration of the measuring method using an external standard, including determination of the recovery rate of the analyte
6.3.1 General
6.3.2 Establishing the calibration function
6.3.3 Determination of the recovery rate
6.3.4 Calculation of results
6.4 Calibration of the measuring method using an internal standard, including determination of the recovery rate of the internal standard
6.4.1 General
6.4.2 Establishing the calibration function
6.4.3 Determination of the recovery rate
6.4.4 Calculation of results
6.5 Calibration of the total procedure using an external standard
6.5.1 General
6.5.2 Establishing the calibration function
6.5.3 Calculation of results
6.6 Calibration of the total procedure using an internal standard
6.6.1 General
6.6.2 Establishing the calibration function
6.6.3 Calculation of results
6.7 Standard addition
6.7.1 General
6.7.2 Procedure
6.7.3 Calculation of results
7 Strategies for testing the validity of calibration
7.1 General
7.2 Testing by means of a control solution or control sample
7.3 Testing the slope of the calibration line
Annex A (informative) Goodness-of-fit test according to Mandel, standard deviation of the procedure, variation coefficient of the procedure and confidence interval
Annex B (informative) Examples of linearity testing
Annex C (normative) Examination of the linear working range using the empirical test of curvature
Annex D (informative) Weighted regression — Weighting 1/x
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Determination of the linear working range and establishment of the calibration range
5.1 General
5.2 Preliminary choice of working range
5.3 Estimation of the linear working range
5.3.1 General
5.3.2 Visual testing of measurement data — Testing using the x/y-diagram
5.3.3 Estimation of the linear range by calculating the point-to-point slope
6 Calibration strategies
6.1 General
6.2 Calculation of the calibration function
6.3 Calibration of the measuring method using an external standard, including determination of the recovery rate of the analyte
6.3.1 General
6.3.2 Establishing the calibration function
6.3.3 Determination of the recovery rate
6.3.4 Calculation of results
6.4 Calibration of the measuring method using an internal standard, including determination of the recovery rate of the internal standard
6.4.1 General
6.4.2 Establishing the calibration function
6.4.3 Determination of the recovery rate
6.4.4 Calculation of results
6.5 Calibration of the total procedure using an external standard
6.5.1 General
6.5.2 Establishing the calibration function
6.5.3 Calculation of results
6.6 Calibration of the total procedure using an internal standard
6.6.1 General
6.6.2 Establishing the calibration function
6.6.3 Calculation of results
6.7 Standard addition
6.7.1 General
6.7.2 Procedure
6.7.3 Calculation of results
7 Strategies for testing the validity of calibration
7.1 General
7.2 Testing by means of a control solution or control sample
7.3 Testing the slope of the calibration line
Annex A (informative) Goodness-of-fit test according to Mandel, standard deviation of the procedure, variation coefficient of the procedure and confidence interval
Annex B (informative) Examples of linearity testing
Annex C (normative) Examination of the linear working range using the empirical test of curvature
Annex D (informative) Weighted regression — Weighting 1/x
Bibliography