ISO 11352-2012 pdf free download.Water quality一Estimation of measurement uncertainty based on validation and quality control data.
ISO 11352 specifies methods for the estimation of measurement uncertainty of chemical and physicochemical methods in single laboratories based on validation data and analytical quality control results obtained within the field of water analysis.
NOTE 1 The principles of the estimation of uncertainty specified in this International Standard are consistent with the principles described in ISO/IEC Guide 98-3.
In this International Standard, the quantification of measurement uncertainty relies on performance characteristics of a measurement procedure obtained from validation and the results of internal and external quality control.
NOTE 2 The approaches specified in this International Standard are mainly based on OUAM(111, NEN 7779161, Nordtest TR 5371101, and Eurolab TR 1191.
NOTE 3 This International Standard only addresses the evaluation of measurement uncertainty for results obtained from quantitative measurement procedures, The uncertainties associated with results obtained from qualitative procedures are not considered.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO/IEC Guide 98-3:2008, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM: 1995)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 trueness closeness of agreement between the average of an infinite number of replicate measured quantity values and a reference quantity value [ISO/IEC Guide 99:200717], 2.14]
3.2 precision closeness of agreement between indications or measured quantity values obtained by replicate measurements on the same or similar objects under specified conditions [ISO/IEC Guide 99:20071,12.15]
3.3 error measurement error measured quantity value minus a reference quantity value
[ISO/I EC Guide 99:20O7Ll, 2.16]
3.4 systematic error
systematic measurement error
component of measurement error that in replicate measurements remains constant or varies in a predictable manner
[ISOIIEC Guide 99:2OO7(J, 2.17]
3.5 bias
measurement bias
estimate of a systematic measurement error
[lSOll EC Guide 99:2007LI, 2.18]
3.6 random error
random measurement error
component of measurement error that in replicate measurements varies in an unpredictable manner
[ISOIIEC Guide 99:2007(71, 2.19]
3.7 repeatability conditions
observation conditions where independent testlmeasurement results are obtained with the same method on identical test/measurement items in the same test or measuring facility by the same operator using the same equipment within short intervals of time
[ISO 35342:2OO611J, 3.3.6]
3.8 repeatability
precision under repeatability conditions
[ISO 3534-2:20061’I, 3.3.5].ISO 11352 pdf download.