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 6. Denitrification rates from studies of various sand and gravel aquifers. Methods included slurry incubations, in-situ studies, excess N2 analyses, and tracer tests.
|
|
Denitrification rate mmol NO3- L-1 yr-1 |
|
Studies |
Method |
Minimum |
Maximum |
Vogel et al. (1981) |
Excess N2 and Tritium age dates |
NA |
0.0001 |
Trudell et al. (1986) |
In-situ study |
4.88 |
81.3 |
Gillham et al. (1990) |
In-situ study |
15.0 |
87.6 |
Bohlke and Denver (1995)† |
Excess N2 and CFC age dates |
0.001 |
0.01 |
Smith et al. (1996) |
Tracer study |
0.13 |
0.31 |
|
Slurry incubation |
0.53 |
1.23 |
|
Soil core incubation |
0.69 |
1.61 |
|
Soil core incubation |
1.38 |
3.22 |
Tesoriero et al. (2000) |
Excess N2 and CFC age dates |
0.01 |
0.14 |
|
Excess N2 and CFC age dates |
1.3 |
2.7 |
|
In-situ study |
NA |
140 |
Puckett et al. (2002) |
Slurry incubation |
0.99 |
34.46 |
This study |
Excess N2 and CFC age dates |
0.005 |
0.047 |
†Rates calculated from data provided by Bohlke and Denver
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