800
700
600
y = 668.9x2 + 1420.9x
500
400
300
200
100
0
0
0.2
0.4
0.6
0.8
1.0
1.2
Concentration (mg/L)
Figure 4. Calibration curve obtained for RDX by GC-ECD analysis.
Table 5. Method detection limit (MDL) study of blank soil spiked
with five target analytes and analyzed by GC-NPD.
Found concentration (mg/kg)
Rep.
2,4- DNT
TNT
RDX
4ADNT
2ADNT
1
0.429
0.451
0.510
0.438
0.461
2
0.281
0.499
0.486
0.506
0.503
3
0.359
0.493
0.548
0.477
0.498
4
0.388
0.532
0.558
0.532
0.532
5
0.411
0.538
0.478
0.499
0.521
6
0.363
0.508
0.486
0.486
0.529
7
0.327
0.456
0.558
0.484
0.444
Theoretical*
0.386
0.497
0.505
0.454
0.442
Mean
0.365
0.497
0.518
0.489
0.498
Std. dev.
0.0505
0.0338
0.0361
0.0289
0.0340
MDL
0.15
0.10
0.11
0.087
0.10
Recovery
94.5%
100%
103%
108%
113%
*Expected analyte concentration.
9
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