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precision was measured by using the mean results of the duplicate
samples analyzed on each day on 10 different days.
(
h
)
Ruggedness and robustness
.
—
To determine the ruggedness of
the method, laboratory control samples were analyzed by two analysts
on 10 different days. Also, NIST SRM 1849 was analyzed in triplicate
with varying sample weights and with different internal standards.
(
i
)
Reproducibility.
—Eight
laboratories
completed
a
multilaboratory testing protocol with this method on seven samples
submitted as blind duplicates (14 total samples analyzed plus the
SRM 1849a control, which was not blinded). Represented were
four countries, and five models of ICP-MS from three major
vendors. Results showed an average RSD
R
of 9.3% for Cr, 5.3%
for Mo, and 6.5% for Se, with an average HorRat of 0.35 across all
three analytes and samples.
References: (1) IUPAC (1996)
Pure Appl. Chem
.
68
, 1167–1193
(2) Kralj, P., & Verber, M. (2003)
Acta Chim. Slov
.
50
, 633–644
(3) Gammelgaard, B., & Jons, O. (1999)
J. Anal.
Atom. Spectrom
.
14
, 867–874
(4) Feldmann, I., Jakubowski, N., Thomas, C., & Stuewer,
D. (1999)
Fresenius’J. Anal. Chem
.
365
, 415–421
J. AOAC Int . 95 , 588(2012)AOAC SMPR 2011.009
J. AOAC Int . 95 , 297(2012)DOI: 10.5740/jaoac.int.11-0441
Posted: February 2, 2015
Candidates for 2016 Method of the Year
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