132
3 Traceability: Reference Materials
I.-~ _ _ H _ u_ m_ an _ _ _ ----,~
Material
~
L-~ _ _ _ _ _ _ _ ...J
What?
Instrumental
Methodological
---_~~
How?
Environmental
~~ _ _ ~_ m_po _r _ al _ _ _ ~ ~
Fig. 3.13. Tracking facet of traceability of an analytical result
(
Fig. 3.14. Practical implications of traceability: comparability among three laboratories (C),
which rests on traceability of their results to primary standards of mutually related traceability (B) arising from their individual relationships (A) to base standards
3.6.2 Traceability of a Sample (Aliquot)
The sample aliquots that are ultimately subjected to the analytical process
exhibit two intertwined traceability aspects that materialize in an unbroken,
cyclic chain of relations (see Fig. 3.15).