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UNCERTAINTY FROM SAMPLING
– A NORDTEST HANDBOOK FOR SAMPLING
PLANNERS ON SAMPLING QUALITY
ASSURANCE AND UNCERTAINTY ESTIMATION
BASED UPON THE EURACHEM INTERNATIONAL GUIDE
ESTIMATION OF MEASUREMENT UNCERTAINTY ARISING
FROM SAMPLING
Heterogeneity
Sampling
Uncertainty
Measurement
Uncertainty
contributes
towards
Decision
uncertainty
Analytical
Uncertainty
Christian Grøn, Jette Bjerre Hansen,
Bertil Magnusson, Astrid Nordbotten,
Mikael Krysell, Kirsten Jebjerg Andersen
and Ulla Lund
Nordic Innovation Centre
Telephone +47 47 61 44 00
ISSN 0283-7234
Stensberggata 25
Fax +47 22 56 55 65
NO-0170 OSLO
info@nordicinnovation.net
Norway
www.nordicinnovation.net
NT TECHN REPORT 604
Approved 2007-06
Authors:
Christian Grøn
1)
, Jette Bjerre Hansen
1)
,
Bertil Magnusson
2)
, Astrid Nordbotten
3)
,
Mikael Krysell
4)
, Kirsten Jebjerg Andersen
4)
and Ulla Lund
4)
Nordic Innovation Centre project number:
04130
Institution:
1)
DHI
2)
SP Technical Research Institute of Sweden
3)
Food Safety Authority, Norway
4)
Eurofins A/S
Title:
Uncertainty from sampling
A Nordtest Handbook for Sampling Planners on Sampling Quality Assurance and
Uncertainty Estimation
Based upon the Eurachem International Guide
Estimation of Measurement Uncertainty
Arising from Sampling
Abstract:
The handbook provides practical guidance on sampling uncertainty estimation in the
Nordtest TR handbook format. The handbook is an extract of and based upon the
principles, methods and text of the international Eurachem Guide
Estimation of
measurement uncertainty arising from sampling.
The Eurachem guide is more
extensive and provides details on theory and additional examples. The basic reference
for the text in this handbook is the above-mentioned Eurachem guide.
The overall purpose of this handbook has been to provide those working with
investigations, monitoring and control that require sampling with a set of tools for
calculation and control of the sampling uncertainty of their sampling procedure. Four
examples illustrate the application of different methods and tools, while allowing you
to follow all steps of the calculations. Although the examples are given for specific
matrices (groundwater, iron ore, baby food and wastewater) the approaches are
widely applicable.
It is the intention of the project group to make these tools and the understanding of
their use available outside the world of analytical chemistry, although the basic
principles applied originate from analytical chemistry.
Technical Group:
ISSN:
0283-7234
Language:
English
Pages:
36 p. + 4 appendices
Key Words:
Sampling, uncertainty, food, ore, soil, waste, groundwater, waste water, validation, quality control
Distributed by:
Nordic Innovation Centre
Stensberggata 25
NO-0170 Oslo
Norway
Report Internet address:
info@nordicinnovation.net
www.nordicinnovation.net
Preface
The task of compiling and editing this handbook has been made possible by the
financial support from Nordic Innovation Centre/Nordtest through project 04130.
The work has been performed by a Nordic project group consisting of:
Christian Grøn, Jette Bjerre Hansen, DHI, Denmark
Bertil Magnusson, SP Technical Research Institute of Sweden
Mikael Krysell, Ulla O. Lund and Kirsten Jebjerg Andersen, Eurofins A/S, Denmark
Astrid Nordbotten, Food Safety Authority, Norway
The handbook provides practical guidance on sampling uncertainty estimation in the
Nordtest TR handbook format. The handbook is an extract of and based upon the
principles, methods and text of the international Eurachem Guide
Estimation of
measurement uncertainty arising from sampling.
The Eurachem guide is more
extensive and provides details on theory and additional examples. The latest
information on the guide is available on the Eurachem website,
www.eurachem.com
.
The basic reference for the text in this handbook is the above-mentioned Eurachem
guide.
For valuable comments on the contents we thank Mike Ramsey and Paolo de Zorzi
from the Eurachem working group.
The overall purpose of this handbook has been to provide those working with
investigations, monitoring and control that require sampling with a set of tools for
calculation and control of the sampling uncertainty of their sampling procedure. It is
the intention of the project group to make these tools and the understanding of their
use available outside the world of analytical chemistry, although the basic principles
applied originate from analytical chemistry. The project group hopes that this was
achieved but if not, please recall that statistics generally seem more complicated than
they are.
i
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