Quality assessment of INAA data for small-sized environmental reference samples

Wanna Wimolwattanapun, Supamatthree Bunprapob, Mang Dung Ho, Sutisna, Yasuji Oura, Mitsuru Ebihara*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Instrumental neutron activation analysis (INAA) was applied for the accurate and precise determination of minor and trace elements in small-sized aliquants (1 to 2 mg) of two certified reference materials (CRM), NIES No. 8 and NIST 1632c. Four laboratories used either comparative- or k 0 -INAA, or both, and repeated the analysis more than ten times for each CRM. Based on z-scores and zeta scores of analytical data, QA/QC in analyzing such small scale of the two reference samples was assessed, revealing that there was a clear difference in the analytical ability among participating laboratories. It was concluded that the two CRM samples on the mg scale can be used as reference samples in INAA of a similarly small-scaled sample, at least for the 16 - 18 elements examined.

Original languageEnglish
Pages (from-to)787-792
Number of pages6
JournalAnalytical Sciences
Issue number8
Publication statusPublished - 2014
Externally publishedYes


  • INAA
  • QA/QC
  • Reference samples
  • Z-score
  • Zeta score

ASJC Scopus subject areas

  • Analytical Chemistry


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