National Water-Quality Assessment (NAWQA) Program
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Using Chemical, Hydrologic, and Age Dating Analysis to Delineate Redox Processes and Flow Paths in the Riparian Zone of a Glacial Outwash Aquifer-Stream System
By Larry J. Puckett, Timothy K. Cowdery, Peter B. McMahon, Lan H. Tornes, and Jeffrey D. Stoner
[Water Resources Research, vol. 38, no. 8, August 2002]Table 2. Concentrations of selected constituents in the Otter Tail River between February 8, 1993 and August 2, 1995. [All concentrations are mmol L-1 with the exception of pH which is in standard units; DKN and TKN are reported as mmol L-1 N, dissolved organic carbon (DOC) is reported as mmol L-1 C, sample depths are in meters. DKN=Dissolved Kjeldahl Nitrogen, TKN=Total Kjeldahl Nitrogen. Values reported as “0” were less than the detection limit.]
Constituent |
Median |
Range |
pH |
7.9 |
7.3-8.4 |
O2 |
246.9 |
68.8-393.8 |
HCO3- |
3696 |
3229-4802 |
Ca2+ |
1048 |
923-1322 |
Mg2+ |
863.7 |
740.3-1111 |
Na+ |
200.1 |
156.6-282.8 |
K+ |
56.3 |
30.7-76.7 |
SiO2 |
233.0 |
124.8-316.2 |
Fe2+ |
1.68 |
0.32-3.2 |
Mn2+ |
0.96 |
0.29-2.4 |
Cl- |
90.3 |
62.1-141.1 |
SO42- |
27.1 |
10.4-44.8 |
PO43- |
0.2 |
0-1.0 |
DP |
0.2 |
0-1.0 |
TP |
1.0 |
0.20-1.9 |
NO3- |
5.0 |
0-46.4 |
NH4+ |
2.1 |
0.5-15.0 |
DKN |
35.7 |
28.6-57.1 |
TKN |
46.4 |
28.6-64.3 |
DOC |
675.0 |
566.7-1000 |
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