Certified Reference Materials in Inorganic Trace Analysis

Certified Reference Materials in Inorganic Trace Analysis 

Laboratory of Nuclear Analytical Methods, Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland e-mail r.dybczynski ichtj.waw.pl 

Correct decisions can be taken if the analytical results on which they are based are reliable (i.e., they are both accurate and precise). Let us recall a few basic definitions [1]  

Measurement accuracy closeness of agreement between a measured quantity value and a true quantity value of a measurand 

Measurement precision closeness of agreement between indications or measured quantity values obtained by replicate measurements on the same or similar objects under specified conditions 

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Any CRM for chemical composition is suitable for the purpose of trace analysis if it is certified for trace constituents and minimum sample mass, which guarantees that the homogeneity of the material is appropriate for the analytical method used in a laboratory. Taking into account the matrix, it if often useful to distinguish the following main classes of reference materials for chemical composition for inorganic trace analysis ... 

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