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M
ASTOVSKA
ET AL
.:
J
OURNAL OF
AOAC I
NTERNATIONAL
V
OL
.
98, N
O
. 2, 2015
485
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remove potential contamination.
D. Reference Standards
(
a
)
PAH standards.—
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cd
]pyrene, naphthalene, phenanthrene,
and pyrene).
(
b
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U.S. Environmental Protection Agency (EPA) 16 PAH
cocktail.—
( & 3URGXFW 1R (6
J P/ P/
LQ QRQDQH &DPEULGJH ,VRWRSH /DEV
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)
or equivalent.
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6
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a
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cd
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phenanthrene ( &
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6
E. Preparation of Standard Solutions
(
a
)
Individual stock solutions.—
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J P/ LQ WROXHQH
(
b
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stock solutions to obtain a mixed solution of each PAH at
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a
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See
Table
2014.08E
for analyte concentrations in the mixed stock standard solution.
(
c
)
Working PAH Solution A.—
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and dilute to volume with isooctane.
(
d
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Working PAH Solution B.—
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dilute to volume with isooctane.
(
e
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Internal standard solution.—
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& 3$+V FRFNWDLO ZLWK LVRRFWDQH
(
f
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Calibration standard solutions—
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JODVV LQVHUWV
See
Table
2014.08A
for analyte concentrations in
the calibration standards and Table
2014.08F
for the dilution
scheme.
(
1
)
For level 1 calibration standard
±$FFXUDWHO\ WUDQVIHU
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(
2
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For level 2 calibration standard
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(
3
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For level 3 calibration standard
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&DS WKH YLDO DQG YRUWH[ PL[ EULHÀ\
(
4
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For level 4 calibration standard
±$FFXUDWHO\ WUDQVIHU
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&DS WKH YLDO DQG YRUWH[ PL[ EULHÀ\
(
5
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For level 5 calibration standard
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&DS WKH YLDO DQG YRUWH[ PL[ EULHÀ\
(
6
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For level 6 calibration standard
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&DS WKH YLDO DQG YRUWH[ PL[ EULHÀ\
(
7
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For level 7 calibration standard
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(
8
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For level 8 calibration standard
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Table 2014.08C. (
continued
)
PAH
1R RI
laboratories
1R RI
replicates
Mean
concn, μg/kg
Mean
recovery, % s
r
, μg/kg s
R
, μg/kg RSD
r
, % RSD
R
, % HorRat
10
20
Naph
9
18
10
20
8
16
Phe
8
16
8
16
8
16
Pyr
10
20
10
20
10
20