?ISO 6271:2015 specifies a spectrophotometric method for estimating the colour of clear liquids in terms of platinum-cobalt units (Pt-Co units). It is applicable to clear liquids having a colour characteristic similar to those of the platinum-cobalt colour scale specified in Annex A. For products with colours more intense than the Pt-Co stock solution the method specified in ISO 4630 applies. The spectrophotometric method provides a more precise way of measuring Pt-Co colour than a visual sample comparison by human eyes. NOTE The term "Pt-Co colour" used here is preferred over the terms "Hazen colour" and "APHA colour".
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Sisällysluettelo
Foreword
1 Scope
2 Normative references
3 Principle
4 Apparatus and materials
5 Sampling
6 Procedure
7 Expression of results
8 Precision
8.1 General
8.2 Repeatability limit, r
8.3 Reproducibility limit, R
8.4 Bias
9 Test report
Annex A Platinum-cobalt colour standards (normative)
CIE 15:2004
ISO 15528:2013 Paints, varnishes and raw materials for paints and varnishes -- Sampling
ISO 3696:1987 Water for analytical laboratory use -- Specification and test methods
CIE 15:2004
ISO 15528:2013 Paints, varnishes and raw materials for paints and varnishes -- Sampling
ISO 3696:1987 Water for analytical laboratory use -- Specification and test methods
ISO 5725-2:1994 Accuracy (trueness and precision) of measurement methods and results -- Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method