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The duplicate method of uncertainty estimation: are eight targets enough?
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posted on 2023-06-07, 23:35 authored by Jennifer A Lyn, Michael H Ramsey, D Stephen Coad, Andrew P Damant, Roger Wood, Katy A BoonThis paper presents methods for calculating confidence intervals for estimates of sampling uncertainty (ssamp) and analytical uncertainty (sanal) using the ¿-squared distribution. These uncertainty estimates are derived from application of the duplicate method, which recommends a minimum of eight duplicate samples. The methods are applied to two case studies ¿ moisture in butter and nitrate in lettuce. Use of the recommended minimum of eight duplicate samples is justified for both case studies as the confidence intervals calculated using greater than eight duplicates did not show any appreciable reduction in width. It is considered that eight duplicates provide estimates of uncertainty that are both acceptably accurate and cost effective.
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Publication status
- Published
Journal
AnalystISSN
0003-2654Publisher
Royal Society of ChemistryExternal DOI
Volume
132Page range
1147-1152Pages
6.0Department affiliated with
- Evolution, Behaviour and Environment Publications
Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06Usage metrics
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