ISO 13909-7:2016
Hard coal and coke — Mechanical sampling — Part 7: Methods for determining the precision of sampling, sample preparation and testing
In ISO 13909-7:2016, formulae are developed which link the variables that contribute to overall sampling precision. Methods are described for estimating overall precision and for deriving values for primary increment variance which can be used to modify the sampling scheme to change the precision. Methods for checking the variance of sample preparation and testing are also described.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General
5 Formulae relating to factors affecting precision
5.1 General
5.2 Sampling
6 Estimation of primary increment variance
6.1 Direct determination of individual primary increments
6.2 Determination using the estimate of precision
7 Methods for estimating precision
7.1 General
7.2 Duplicate sampling with twice the number of increments
7.3 Duplicate sampling during routine sampling
7.4 Alternatives to duplicate sampling
7.5 Precision adjustment procedure
8 Calculation of precision
8.1 Replicate sampling
8.2 Normal sampling scheme
9 Methods of checking sample preparation and testing errors
9.1 General
9.2 Target value for variance of sample preparation and analysis
9.2.1 General
9.2.2 Off-line preparation
9.2.3 On-line preparation
9.3 Checking procedure as a whole
9.4 Checking stages separately
9.4.1 General
9.4.2 Procedure 1
9.4.3 Procedure 2
9.4.4 Interpretation of results
9.5 Procedure for obtaining two samples at each stage
9.5.1 With a riffle
9.5.2 With a mechanical sample divider
9.6 Example
Annex A (informative) Variogram method for determining variance
Annex B (informative) Grubbs’ estimators method for determining sampling precision
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General
5 Formulae relating to factors affecting precision
5.1 General
5.2 Sampling
6 Estimation of primary increment variance
6.1 Direct determination of individual primary increments
6.2 Determination using the estimate of precision
7 Methods for estimating precision
7.1 General
7.2 Duplicate sampling with twice the number of increments
7.3 Duplicate sampling during routine sampling
7.4 Alternatives to duplicate sampling
7.5 Precision adjustment procedure
8 Calculation of precision
8.1 Replicate sampling
8.2 Normal sampling scheme
9 Methods of checking sample preparation and testing errors
9.1 General
9.2 Target value for variance of sample preparation and analysis
9.2.1 General
9.2.2 Off-line preparation
9.2.3 On-line preparation
9.3 Checking procedure as a whole
9.4 Checking stages separately
9.4.1 General
9.4.2 Procedure 1
9.4.3 Procedure 2
9.4.4 Interpretation of results
9.5 Procedure for obtaining two samples at each stage
9.5.1 With a riffle
9.5.2 With a mechanical sample divider
9.6 Example
Annex A (informative) Variogram method for determining variance
Annex B (informative) Grubbs’ estimators method for determining sampling precision
Bibliography