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or a nitrogen blow-down system, may be used as long as it
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C. Reagents and Materials
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Hexane.—
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Isooctane.—
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Silica gel SPE column.—
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not be eliminated.
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Sodium chloride (NaCl).—
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Polypropylene centrifuge tubes.—
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D. Reference Standards
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PAH standards.—
High-purity reference standards of the
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1-methylphenanthrene,
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U.S. Environmental Protection Agency (EPA) 16 PAH
cocktail.—
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PAH
No. of
laboratories
No. of
replicates
Mean
concn, μg/kg
Mean
recovery, % s
r
, μg/kg s
R
, μg/kg RSD
r
, % RSD
R
, % HorRat
9
18
18.4
92.1
1.1
1.9
5.7
10.5
0.36
Naph
8
16
27.7
110.7
2.8
2.8
10.3
10.3
0.37
9
18
84.1
105.1
5.6
8.8
6.7
10.5
0.45
8
16
158.7
99.2
9.7
34.2
6.1
21.6
1.02
Phe
8
16
15.1
100.5
0.5
1.2
3.3
7.8
0.26
9
18
49.7
99.4
1.5
3.0
3.1
6.0
0.24
9
18
168.0
96.0
8.6
16.6
5.1
9.9
0.47
Pyr
9
18
14.8
98.5
0.9
1.3
6.1
8.8
0.29
9
18
40.3
100.8
1.6
3.3
3.8
8.2
0.32
8
16
118.7
95.0
2.9
6.4
2.5
5.4
0.25