Measurement Uncertainty in Chemical Analysis

✍ Scribed by Rouvim Kadis (auth.), Prof. Dr. Paul De Bièvre, Prof. Dr. Helmut Günzler (eds.)

• Publisher: Springer-Verlag Berlin Heidelberg
• Year: 2003
• Tongue: English
• Leaves: 294
• Edition: 1
• Category: Library

✦ Synopsis

It is now becoming recognized in the measurement community that it is as important to communicate the uncertainty related to a specific measurement as it is to report the measurement itself. Without knowing the uncertainty, it is impossible for the users of the result to know what confidence can be placed in it; it is also impossible to assess the comparability of different measurements of the same parameter. This volume collects 20 outstanding papers on the topic, mostly published from 1999-2002 in the journal "Accreditation and Quality Assurance." They provide the rationale for why it is important to evaluate and report the uncertainty of a result in a consistent manner. They also describe the concept of uncertainty, the methodology for evaluating uncertainty, and the advantages of using suitable reference materials. Finally, the benefits to both the analytical laboratory and the user of the results are considered.

✦ Table of Contents

Front Matter....Pages I-XII
Analytical procedure in terms of measurement (quality) assurance....Pages 1-7
Metrology in chemistry — a public task....Pages 8-12
Chemical metrology, chemistry and the uncertainty of chemical measurements....Pages 13-18
From total allowable error via metrological traceability to uncertainty of measurement of the unbiased result....Pages 19-23
The determination of the uncertainty of reference materials certified by laboratory intercomparison....Pages 24-28
Evaluation of uncertainty of reference materials....Pages 29-33
Should non-significant bias be included in the uncertainty budget?....Pages 34-38
Evaluation of measurement uncertainty for analytical procedures using a linear calibration function....Pages 39-43
Measurement uncertainty distributions and uncertainty propagation by the simulation approach....Pages 44-51
Evaluation of uncertainty utilising the component by component approach....Pages 52-58
Uncertainty — statistical approach, 1/f noise and chaos....Pages 59-63
Calibration uncertainty....Pages 64-69
Measurement uncertainty in microbiological cultivation methods....Pages 70-73
The use of uncertainty estimates of test results in comparisons with acceptance limits....Pages 74-79
A model to set measurement quality objectives and to establish measurement uncertainty expectations in analytical chemistry laboratories using ASTM proficiency test data....Pages 80-87
Uncertainty calculations in the certification of reference materials. 1. Principles of analysis of variance....Pages 88-93
Uncertainty calculations in the certification of reference materials. 2. Homogeneity study....Pages 94-98
Uncertainty calculations in the certification of reference materials 3. Stability study....Pages 99-105
Some aspects of the evaluation of measurement uncertainty using reference materials....Pages 106-112
Uncertainty — The key topic of metrology in chemistry....Pages 113-114
Estimating measurement uncertainty: reconciliation using a cause and effect approach....Pages 115-119
Measurement uncertainty and its implications for collaborative study method validation and method performance parameters....Pages 120-124
Uncertainty in chemical analysis and validation of the analytical method: acid value determination in oils....Pages 125-130
A practical approach to assessment of sampling uncertainty....Pages 131-137
Quality assurance for the analytical data of micro elements in food....Pages 138-142
Customers’ needs in relation to uncertainty and uncertainty budgets....Pages 143-146
Evaluating uncertainty in analytical measurements: the pursuit of correctness....Pages 147-151
A view of uncertainty at the bench analytical level....Pages 152-157
Uncertainty of sampling in chemical analysis....Pages 158-162
Appropriate rather than representative sampling, based on acceptable levels of uncertainty....Pages 163-169
Experimental sensitivity analysis applied to sample preparation uncertainties: are ruggedness tests enough for measurement uncertainty estimates?....Pages 170-173
Relationship between performance characteristics obtained from an interlaboratory study programme and combined measurement uncertainty: a case study....Pages 174-179
The evaluation of measurement uncertainty from method validation studies....Pages 180-186
The evaluation of measurement uncertainty from method validation studies....Pages 187-196
Is the estimation of measurement uncertainty a viable alternative to validation?....Pages 197-200
Validation of the uncertainty evaluation for the determination of metals in solid samples by atomic spectrometry....Pages 201-206
Statistical evaluation of uncertainty for rapid tests with discrete readings — examination of wastes and soils....Pages 207-210
Influence of two grinding methods on the uncertainty of determinations of heavy metals in atomic absorption spectrometry/electrothermal atomisation of plant samples....Pages 211-215
Measurement uncertainty and its meaning in legal metrology of environmental chemistry and public health....Pages 216-222
Uncertainty evaluation in proficiency testing: state-of-the-art, challenges, and perspectives....Pages 223-226
Uncertainty calculation and implementation of the static volumetric method for the preparation of NO and SO 2 standard gas mixtures....Pages 227-236
Assessment of uncertainty in calibration of a gas mass flowmeter....Pages 237-241
Measurement uncertainty — a reliable concept in food analysis and for the use of recovery data?....Pages 242-247
In- and off-laboratory sources of uncertainty in the use of a serum standard reference material as a means of accuracy control in cholesterol determination....Pages 248-251
Assessment of limits of detection and quantitation using calculation of uncertainty in a new method for water determination....Pages 252-256
Study of the uncertainty in gravimetric analysis of the Ba ion....Pages 257-262
Assessment of permissible ranges for results of pH-metric acid number determinations using uncertainty calculation....Pages 263-266
Uncertainty and other metrological parameters of peroxide value determination in vegetable oils....Pages 267-272
Uncertainty of nitrogen determination by the Kjeldahl method....Pages 273-279
Glossary of analytical terms....Pages 280-283

✦ Subjects

Analytical Chemistry