en.plaurum.ru www.ez-ocm.ru/en Liudmila Gorbatova and Elena Anchutina [email protected]Ekaterinburg Non-Ferrous Metals Processing Plant (EZOCM) The LBMA Assaying and Refining Conference 2017, Royal Garden Hotel, Kensington, London 19 - 22 March 2017
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through interlaboratory experiment by a validated analytical technique (at EZOCM laboratories)
by a standard (State secondary standard of mass fraction and mass
(molar) concentration of metals in liquid and solid substances and materials, GVET 196-1-2012, the holder is Ural Scientific Research Institute (Russia))
by preparation procedure (as precise alloy or certified mix)
INTERLABORATORY EXPERIMENT (ILE)
8
PREPARATION PROCEDURE (as precise alloy)
ADVANTIGIES REQUIREMENTS/ SPECIFICIETIES
Certified value doesn’t depend on
method of measurement
Pure initial metals
“Good” uncertainties
(up to 0.05 % rel.)
Precise alloy
Obvious traceability Certification for matrix elements
ADVANTIGIES REQUIREMENTS/ SPECIFICIETIES
Certification for impurities Need and possibility of obtaining sufficient
number of independent results
Agreement of ILE results is
proving certified value accuracy
Duration of ILE (up to several years)
The dispersion of the ILE results is the main
source of uncertainty of certified value
Unobvious traceability
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Conformity to estimated composition of smelting mix;
Testing by validated method to confirm intended use;
Agreement of RMs of the set;
RM comparison with analogous RM set
CERTIFIED VALUE ACCURACY CONFIRMATION
Au4a-1
Au4a-2
Au4a-3
Au4a-4
Au4a-5
R² = 0,9963
-0,6
-0,4
-0,2
0,0
0,2
0,4
0,6
0,8
1,0
1,2
-4,0 -3,5 -3,0 -2,5 -2,0 -1,5
Lg I
Lg C
Agreement of CRMs Au4a (set) for Fe determination (arc AES, Fe 296.69 nm)