17. TABLES AND FLOW DIAGRAM
Table A1. Preparation of calibration solutions from 125-mg/L
working standard to simulate extracts of 20-g soil subsamples
with 100 mL of acetone.
Volume of
Volume of
Associated
working STD
water
Conc.
soil conc.
(g/mL)
(g/g)
Solution
(mL)
(mL)
A
0
100
0.0
0.0
B
2
98
2.5
12.5
C
4
96
5.0
25.0
D
8
92
10.0
50.0
E
10
90
12.5
62.5
Table A2. Comparison of picric
acid determinations between field
screening method and HPLC.
Picric acid (g/g)
Sample
Screening
HPLC
1
0.0
0.0
2
0.0
0.0
3
25,200
23,000
4
1.9
1.0
5
14.0
24.4
6
6.8
9.8
SOIL SAMPLE
Extract with Acetone
Filter
Dilute with Water
Pass Through Anion Exchanger
Rinse Exchanger with Methanol, then Acetone
Elute with H2SO4 Acetone
Obtain Initial ABS (400 nm)
Dilute with Water and Acetone
Obtain Final ABS (400 nm)
17
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