Pyruvic
Acid
Pyruvic
Acid
Glycolic
Acid
Glycolic
Acid
2-ADNT
4-ADNT
0
5
10
15
20
25
30
35
10
15
20
25
30
0
35
5
Time (min)
Time (min)
b. 2-ADNT.
a. 4-ADNT.
Figure 8. HPLC profile of carboxylic acids formed from the ozonation of 4-ADNT and 2-ADNT using UV
detection at 210 nm.
60
Nitrate
Material balance
A material balance of carbon and
Formate
50
Oxalic
nitrogen was estimated based on anal-
Malonic
Acid
Acid
ytical results of samples subjected to
ozonation. Total organic carbon analy-
S
40
Glyoxylic
ses of samples before and after ozon-
Acid
Glycolate
ation showed a 120% recovery of
Acetate
available carbon, suggesting that little
30
mineralization of carbon (i.e., produc-
tion of CO2) occurs during ozonation. A
combined product quantitation and
20
5
10
15
20
25
0
graph for 2-ADNT and 4-ADNT appear
70
in Figures 10 and 11. The data indicate
Formate
Nitrate
that 35% of the available carbon can be
accounted for by identified products.
60
For nitrogen, 85% of the available
Malonic
Acid
nitrogen was accounted for by nitrite
Oxalic
50
and nitrate. Other nitrogen-containing
Acid
species such as NO and NO2 gases were
40
not detected. Plots of nitrite and nitrate
Glyoxylic
Acid
Glycolate
formation as a function of ADNT con-
Acetate
30
Figure 9. HPLC profile of carboxylic acids
generated from the ozonation of 2-ADNT
(top) and 4-ADNT (bottom) using conduc-
20
5
10
15
20
25
30
0
tivity detection.
Time (min)
8
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