Abstract
The unique value of the neutron activation analysis (NAA) for analytical quality assurance is demonstrated through its contribution to the certification of the reference materials over the time span of 40 years. Ratio primary reference measurement procedures i.e. definitive methods, based on radiochemical NAA, play an important role in confirming the validity of the certified values established in the international intercomparisons. Real analytical situations where the use of NAA was critical to get accurate results are presented. The dangers associated with the possible non-availability of the NAA in the near future are indicated.
Highlights
In the contemporary world many important decisions concerning various domains of human activity may depend upon the results provided by various methods of analytical chemistry, including the inorganic trace analysis
Fig. 1.) concerning various domains of human activity may depend upon the results provided by various methods of analytical chemistry, including the inorganic trace analysis
If we recollect the definition of a measurement accuracy: closeness of agreement between a measured quantity value and a true quantity value of a measurand [14], the data presented in Table 1 clearly show that several laboratories had a tremendous difficulty in determining the true content of certain elements in various matrices
Summary
In the contemporary world many important decisions (cf. Fig. 1.) concerning various domains of human activity may depend upon the results provided by various methods of analytical chemistry, including the inorganic trace analysis. Contribution of NAA to the certification of the candidate reference materials International world-wide interlaboratory comparisons have been used by various organizations as a tool for accurate determination of several elements in different carefully prepared natural materials to issue (after proper elaboration of results sent by individual laboratories), new certified reference materials (CRMs).
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