AOAC-RI ERP Book - FAOM METHOD.pdf

Table 1. Certified Mass Fraction Values for Selected PAHs in SRM 1974c Mass Fraction (a,b,c) (μg/kg)

k

Wet-Mass Basis 2.31 r 0.04 1.53 r 0.02 1.17 r 0.08 3.07 r 0.11 4.56 r 0.04 4.09 r 0.03 2.46 r 0.02 0.951 r 0.007 3.03 r 0.09 1.99 r 0.04 5.69 r 0.11 2.75 r 0.02 0.543 r 0.006 7.33 r 0.05 2.32 r 0.03 0.560 r 0.022 2.82 r 0.05 0.694 r 0.013 1.36 r 0.08 r 0.4 r 0.8 r 1.6

Dry-Mass Basis

Fluorene

1.97 1.99 1.96 1.97 1.97 1.97 1.97 1.97 1.97 1.97 1.97 1.96 1.97 1.96 2.04 1.97 1.98 1.96 1.97 1.97 1.97

22.6 r 15.0 r 11.4 r 30.0 r 44.5 r 39.9 r 24.0 r 9.3 r 29.5 r 19.4 r 55.5 r 26.8 r 5.30 r 71.6 r 22.6 r 5.46 r 27.6 r 6.77 r 13.2 r r r

0.4 0.2 0.8 1.1 0.5 0.4 0.3 0.1 0.9 0.4 1.1 0.3 0.7 0.3 4 9

Dibenzothiophene

Phenanthrene Anthracene

19.6

191

1-Methylphenanthrene 2-Methylphenanthrene 3-Methylphenanthrene 9-Methylphenanthrene 2-Methylanthracene Benzo[ ghi ]fluoranthene Benzo[c]phenanthrene Benz[ a ]anthracene Benzo[ k ]fluoranthene Benzo[ a ]fluoranthene Fluoranthene Pyrene

45.3 23.9

442 233

r 15

0.07

Benzo[ e ]pyrene Benzo[ a ]pyrene

Perylene

0.22

Benzo[ ghi ]perylene Benzo[ b ]chrysene

0.5

0.13

Picene 1.97 (a) Mass fractions are reported on both wet- and dry-mass basis; material as received contains 89.75 % r 0.08 % (95 % confidence level) water. (b) The certified value reported on a wet-mass basis is a weighted mean of average mass fractions, with one average each from two analytical methods [3,4]. The expanded uncertainty is the half width of a symmetric 95 % parametric bootstrap confidence interval [5], which is consistent with the ISO Guide [6,7]. The effective coverage factor k is included in the table for each PAH. (c) GC/MS (Ia) using SPE clean-up followed by analysis on a DB-17MS column using EI-MS and GC/MS (IIa) using SPE and SEC clean-up followed by analysis on a DB-XLB column using EI-MS. 0.8

SRM 1974c

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