National Water-Quality Assessment (NAWQA) Program
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Transport and Fate of Nitrate in a Glacial Outwash Aquifer in Relation to Ground-Water Age, Land Use Practices and Redox Processes
By Larry J. Puckett and Timothy K. Cowdery
[Journal of Environmental Quality, vol. 31, no. 3, p. 782-796 ]Table 3. Median concentrations of S2-, dissolved gases, NO3-, excess N2 (Xs N2), reconstructed NO3- (SNO3-), and CFC-based apparent ages of samples collected during 1994, 1995, and 1997. [All concentrations are mmol L-1 and ages are in years. NO3- concentrations may differ from Table 4 because only samples having paired N2 gas data were included in the calculations.]
Site |
S2- |
O2 |
CO2 |
CH4 |
Ar |
N2 |
Xs N2 |
NO3- |
SNO3- |
CFC Apparent Age |
OF1S |
0 |
11.5 |
788.6 |
0.1 |
17.2 |
746.3 |
97.7 |
1071.4 |
1266.8 |
8-11 |
OF1A |
0 |
37.5 |
545.5 |
0.0 |
16.7 |
880.0 |
249.0 |
628.6 |
1126.5 |
22 |
OF1B |
0 |
10.0 |
521.9 |
0.0 |
17.6 |
928.2 |
265.4 |
610.7 |
1141.4 |
24-25 |
OF1C |
0.78 |
2.3 |
600.8 |
15.5 |
18.2 |
957.3 |
274.6 |
0 |
549.2 |
46-47 |
OF1D |
0.84 |
4.9 |
621.6 |
214.7 |
18.6 |
859.8 |
162.2 |
0 |
324.4 |
>50 |
OF2D |
0.5 |
6.3 |
493.2 |
2.2 |
18.1 |
982.1 |
302.3 |
0 |
604.6 |
† |
OF3S |
0 |
145.3 |
250.0 |
0 |
18.7 |
747.9 |
48.9 |
564.3 |
662.2 |
5-8 |
OF3M |
0 |
0 |
634.6 |
0.3 |
15.1 |
967.4 |
394.4 |
4.3 |
793.15 |
37 |
OF3D |
0.9 |
0 |
570.0 |
25.1 |
16.8 |
980.2 |
345.9 |
5.1 |
696.9 |
47-48 |
OF5S |
0 |
181.3 |
1045.5 |
0 |
20.3 |
813.2 |
88.4 |
95.7 |
272.4 |
5-8 |
†no data available
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