Table 3. Percent recoveries of spikes by acetonitrile extraction.
13 ppm spikes
TNT
4ADNT
2ADNT
2,6DANT
2,4DANT
TNB
HMX
RDX
Compost
% recovery
35
91
88
45
27
58
94
97
% rsd-triplicates
16
8
11
9
12
58
7
11
Digester-Day 90
% recovery
88
25
40
21
7
96
103
90
% rsd
10
8
40
13
12
0
7
2
Sand
% recovery
93
82
97
27
11
86
92
97
% rsd
3
1
3
8
9
2
2
2
2575 ppm spikes
Compost
% recovery
72
58
82
92
69
64
82
103
82%. The DANTs were recovered at less than 27%.
digester sludge were 90% and above for the
The recoveries from compost were greater than
nitramines and 88% for TNT. The recoveries of the
94% for the nitramines (RDX and HMX); however,
TNT transformation products were less than 40%
the recovery of TNT dropped to 35%. This sug-
for the aminodinitrotoluenes and less than 21%
gests that TNT is transformed and conjugated rap-
for the diaminonitrotoluenes. Reproducibility for
idly by compost. The recoveries of the transfor-
these recovery estimates was best in sand (rsd =
mation products were similar to the recoveries
5.0%) and about 10% for compost and digester
from sand, but these values could be inflated by
sludge. When the compost was spiked at concen-
material initially added as TNT. Recoveries from
trations ranging from 25 to 75 mg/kg, recoveries
Table 4. Effect of neutralization pH on percent recovery of hy-
drolyzed spikes.
% recovery of spikes
4ADNT
2ADNT
2,6DANT
2,4DANT
3,5DNA
Compost A
pH 4
nd*
nd
14
42
74
pH 5
nd
nd
22
76
58
pH 6
nd
nd
19
76
10
Compost B
pH 4
nd
nd
10
29
75
pH 5
nd
nd
12
39
51
pH 6
nd
nd
8
29
28
Compost C
pH 4
nd
nd
20
70
85
pH 5
nd
nd
18
72
75
pH 6
nd
nd
12
39
57
Compost D
pH 4
nd
nd
16
63
92
pH 5
nd
nd
19
76
104
pH 6
nd
nd
9
40
61
*nd= <0.4%
8
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