Redox Processes and Flow Paths in Riparian Zone of a Glacial Outwash Aquifer

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

Table 3. Median concentrations of major-ions in samples collected between 1994 and 1997. [All concentrations are mmol L^-1 with the exception of pH which is in standard units; organic nitrogen (Org-N) is reported as mmol L^-1 N, dissolved organic carbon (DOC) is reported as mmol L^-1 C, sample depths are in meters. Values reported as “0” were less than the detection limit.]

Site	Depth	pH	O₂	HCO₃^-	Ca²⁺	Mg²⁺	Na⁺	K⁺	SiO₂	Fe²⁺	Mn²⁺	Cl^-	SO₄^2-	PO₄^3-	NO₃^-	NH₄⁺	Org-N	DOC
OF1S	3.35	7.16	9.4	5343	2495	1172	100.1	35.8	416.0	0	0.4	479.6	249.8	0.6	928.3	0.7	6.4	149.9
OF1A	5.19	7.43	43.8	4796	2196	946.0	87.0	38.4	366.1	0	0	423.2	333.1	0.6	628.4	0.6	6.5	91.6
OF1B	6.54	7.36	17.2	4605	2221	946.0	82.7	40.9	366.1	0	1.5	371.0	327.9	0.6	609.9	1.0	6.0	108.2
OF1C	9.97	7.22	2.3	5446	1946	863.7	139.2	40.9	432.6	50.7	11.3	162.2	84.3	1.3	0	20.5	4.2	199.8
OF1D	13.11	7.55	3.1	6058	1971	863.7	200.1	42.2	432.6	79.7	3.7	45.1	10.4	5.1	0	45.7	7.9	262.3
A1	1.0	7.34	101.1	4932	2495	1111	87.0	37.1	416.0	0	0	564.2	301.9	1.1	1249.6	1.8	5.3	104.1
A2	1.45	7.50	15.6	4720	2183	946.0	80.5	33.2	366.1	0	0	338.5	333.1	0.5	531.6	1.4	5.7	104.1
A2”	1.3	7.41	8.9	4739	2146	884.3	80.5	38.4	357.8	3.1	5.9	270.8	312.3	0.9	43.7	7.5	0	124.9
A3	1.0	7.31	1.8	5449	2146	884.3	84.8	42.2	549.1	55.5	7.6	310.3	244.6	1.4	0	11.1	3.2	154.3
A4	1.0	7.25	6.3	5655	2046	863.7	82.7	43.5	582.4	58.0	5.6	259.5	66.1	4.4	0	34.7	4.6	183.2
A5	0.5	7.06	10.2	6517	2171	822.6	113.1	51.1	865.3	131.2	7.5	172.1	0.5	2.7	0	194.6	27.3	283.1
River	---	7.99	246.9	3696	1048	864.0	200.1	56.3	233.0	1.68	0.9	90.3	27.1	0.2	5.0	2.1	44.3	675.0

Nutrients National Synthesis Project