Abstract
Preparation and certification of a new Polish reference material (CTA-VTL-2) for inorganic trace analysis including microanalysis is described. Virginia Tobacco Leaves of Bulgarian origin were hand picked, dried, comminuted and sieved at conditions preventing contamination of the material with metals. Ca. 13 kg of the material with particle size φ≤ 80 μm was prepared. Certification was based on world-wide interlaboratory comparison in which 60 laboratories from 18 countries participated. Data evaluation was done using an approach which includes rejection of outliers by concurrent use of four different outlier tests followed by calculation of overall means, confidence intervals etc. Several criteria were employed to qualify or disqualify the obtained overall mean as a certified or information value, respectively. 33 elements were certified and information values were established for 10 others. Particle size distribution of CTA-VTL-2 was investigated microscopically. The modal particle diameter was in the range of 15–35 μm. Extensive homogeneity checking by neutron activation analysis revealed that the material is sufficiently homogeneous for mg sample sizes.
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Received: 23 May 1997 / Revised: 23 September 1997 / Accepted: 28 September 1997
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Figure 1
Typical particle size distribution of Virginia Tobacco Leaves (CTA-VTL-2) as determined by microscopic measurements. (GIF 2KB)
Table 1
Fisher's test for the candidate reference material Virginia Tobacco Leaves (CTA-VTL-2), sample weights: 100 mg, 50 mg, 30 mg, 5 mg and 1 mg. (PDF 9 KB)
Table 2
t-Student's test for the candidate reference material Virginia Tobacco Leaves (CTAVTL- 2), sample weights: 100 mg, 50 mg, 30 mg, 5 mg and 1 mg(PDF 10 KB)
Table 3
The share of various analytical techniques employed in CTA-VTL-2 intercomparison (PDF 6 KB)
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Dybczyński, R., Polkowska-Motrenko, H., Samczyński, Z. et al. Virginia Tobacco Leaves (CTA-VTL-2) – new Polish CRM for inorganic trace analysis including microanalysis. Fresenius J Anal Chem 360, 384–387 (1998). https://doi.org/10.1007/s002160050718
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DOI: https://doi.org/10.1007/s002160050718