Data Set Interpretation
12
Data Set Data Set Interpretation Interpretation Susan Bolyard Susan Bolyard Hydrochemical Techniques Hydrochemical Techniques
-
Upload
kellie-savage -
Category
Documents
-
view
62 -
download
1
description
Data Set Interpretation. Susan Bolyard Hydrochemical Techniques. Ouachita Mountain Area Plotted dissolved ion and Cl concentration covariations to determine geochemical behavior patterns - PowerPoint PPT Presentation
Transcript of Data Set Interpretation
Data Set InterpretationData Set Interpretation
Susan BolyardSusan Bolyard
Hydrochemical TechniquesHydrochemical Techniques
Ouachita Mountain AreaOuachita Mountain Area Plotted dissolved ion and Cl Plotted dissolved ion and Cl
concentration covariations to concentration covariations to determine geochemical behavior determine geochemical behavior patternspatterns Cl ions do not participate in weathering Cl ions do not participate in weathering
reactions since local lithologies contain reactions since local lithologies contain no evaporites. Therefore, Cl ionswould no evaporites. Therefore, Cl ionswould primarily come from human influence primarily come from human influence and are conservative throughout the and are conservative throughout the hydrogeologic cycle. hydrogeologic cycle.
Cation/Anion BalanceCation/Anion Balance Ca vs. HCOCa vs. HCO33 and Ca + Mg vs. HCO and Ca + Mg vs. HCO3 3
ClCl vs Na vs Na
Many points fall Many points fall above the above the seawater-seawater-dilution line dilution line (slope =2), (slope =2), indicating the indicating the Na content in Na content in these waters these waters increases due increases due to rock-water to rock-water interactions interactions related to silica related to silica weatheringweathering
0
2
4
6
8
10
12
14
0 2 4 6 8 10 12 14
Na (ppm)
Cl (
pp
m)
Cl vs. KCl vs. K Waters with low K Waters with low K
concentrations concentrations tend to have tend to have varying Cl varying Cl concentrations.concentrations.
If the K values If the K values are high, could are high, could indicate anthropic indicate anthropic originorigin
0
1
2
3
4
5
6
7
8
9
0 1 2 3 4 5 6 7 8 9
K ppm
Cl p
pm
Cl vs. SOCl vs. SO44
Sulfate Sulfate concentrations concentrations variable at Cl variable at Cl values < 6. In the values < 6. In the Ouachitas there is Ouachitas there is one location of one location of possible possible evaporite-like evaporite-like rocks created by rocks created by metamorphic metamorphic activity. activity. Increased values Increased values of SO4 could be of SO4 could be found in this found in this environment (by environment (by Magnet Cove)Magnet Cove)
0
2
4
6
8
10
12
14
0 2 4 6 8 10 12 14
SO4 ppm
Cl
pp
m
Cl vs. NOCl vs. NO33
Nirate levels are Nirate levels are defined by a defined by a linear trend with linear trend with large variations. large variations. This could reflect This could reflect agricultural agricultural practices or practices or sewage effluent. sewage effluent.
The locations The locations where NOwhere NO3 3
values are 0 values are 0 ppm and the Cl ppm and the Cl values read values read around 4ppm around 4ppm could indicate could indicate denitrification.denitrification.
0
2
4
6
8
10
12
14
0.00 5.00 10.00 15.00 20.00 25.00 30.00
NO3 ppm
Cl p
pm
Cation/Anion BalanceCation/Anion Balance
CationsCations Na, Ca, Mg, KNa, Ca, Mg, K
AnionsAnions Cl, SO4, NO3, Cl, SO4, NO3,
HCO3HCO3
A bit of a charge A bit of a charge imbalance imbalance weighing heavy on weighing heavy on the negative the negative charge.charge.
Cation/Anion Cation/Anion balance percent = balance percent = 7.5%7.5%
RR2 2 value of 0.998value of 0.998
0.00
1.00
2.00
3.00
4.00
5.00
6.00
0.00 1.00 2.00 3.00 4.00 5.00 6.00
Cation Totals
An
ion
To
tals
Cl vs. Ca, Mg and HCOCl vs. Ca, Mg and HCO33
0
2
4
6
8
10
12
14
0 10 20 30 40 50 60 70 80 90 100
Ca (ppm)
Cl (
pp
m)
0
2
4
6
8
10
12
14
0 2 4 6 8 10 12 14
Mg ppm
Cl p
pm
0
2
4
6
8
10
12
14
0.00 50.00 100.00 150.00 200.00 250.00 300.00 350.00
HCO3 mg/L
Cl m
g/L
Ca vs. HCOCa vs. HCO33
Comparing Ca to HCOComparing Ca to HCO33, , most of the data points most of the data points are off of the Ca=HCOare off of the Ca=HCO33 equivalent line. This equivalent line. This would indicate an anion would indicate an anion influence and inferring influence and inferring that another cation is that another cation is necessary to reach a necessary to reach a balance.balance.
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
0 10 20 30 40 50 60 70 80 90 100
Ca ppm
HC
O3
pp
m
Ca + Mg vs HCOCa + Mg vs HCO33 Ca + Mg plotted as a Ca + Mg plotted as a
function of HCOfunction of HCO33
Points are better Points are better scattered around the scattered around the 1:1 line1:1 line
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00
HCO3 meq/L
Ca
+ M
g m
eq/L
