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Validation in Chemical Measurement (Paperback, Softcover reprint of hardcover 1st ed. 2005)
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Validation in Chemical Measurement (Paperback, Softcover reprint of hardcover 1st ed. 2005)
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Validationofmeasurementmethodshasbeenusedforavery ciated
measurement uncertainty? The answer must be: no.
longtimeinchemistry. Itismostlybasedontheexamination
Therecanneverbeamechanismorrecipeforproducing - of a measurement
procedure for its characteristics such as tomatically 'valid'
results because one can never eliminate precision, accuracy,
selectivity, sensitivity, repeatability, re- theskills,
theroleandtheresponsibilityoftheanalyst. producibility,
detectionlimit, quanti?cationlimitandmore. ISO 9000:2000, item 3.
8. 5 de?nes validation as 'con?r- When focussing on quality
comparability and reliability mation by examination and provision
of objective evidence in chemical measurement, the ?elds of
interest to this Jour- that the requirements for an intended use
are ful?lled'. The nal, one stumbles into various interpretations
of the term revised edition of the VIM ('VIM3'), is likely to
?ne-tune validation. It is one more example of a term which is used
thisde?nitionoftheconcept'validation'tobe'con?rmation sometimes
very consistently, sometimes very loosely or in- through
examination of a given item and provision of - deed ambiguously.
Since the term is very common in the jective evidence that it
ful?lls the requirements for a stated chemical community, it is
important that its meaning be intendeduse'. nd clear. Turning to
the 2 edition of the International Vo- Lookingatsimplepractice,
manypeoplearelookingfor cabulary of Basic and General terms in
Metrology (VIM) aformaldecisionthatagivenmeasurementmethod automat-
(1993), surprisingly we do not ?nd a de?nition. Webster's ically
gives them 'valid' i. e. reliable results. One wonders Dictionary
of the English language (1992) tells us that val- what this has to
do with 'stated intended use'. Reliab- idation is 'making or being
made valid'. Obviously valida- ity clearly is a property of a
measurement result.
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