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Data Set Interpretation

Data Set Interpretation. Susan Bolyard Hydrochemical Techniques. Ouachita Mountain Area Plotted dissolved ion and Cl concentration covariations to determine geochemical behavior patterns

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Data Set Interpretation

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  1. Data Set Interpretation Susan Bolyard Hydrochemical Techniques

  2. Ouachita Mountain Area • Plotted dissolved ion and Cl concentration covariations to determine geochemical behavior patterns • Cl ions do not participate in weathering reactions since local lithologies contain no evaporites. Therefore, Cl ionswould primarily come from human influence and are conservative throughout the hydrogeologic cycle. • Cation/Anion Balance • Ca vs. HCO3 and Ca + Mg vs. HCO3

  3. Cl vs Na • Many points fall above the seawater-dilution line (slope =2), indicating the Na content in these waters increases due to rock-water interactions related to silica weathering

  4. Cl vs. K • Waters with low K concentrations tend to have varying Cl concentrations. • If the K values are high, could indicate anthropic origin

  5. Cl vs. SO4 • Sulfate concentrations variable at Cl values < 6. In the Ouachitas there is one location of possible evaporite-like rocks created by metamorphic activity. Increased values of SO4 could be found in this environment (by Magnet Cove)

  6. Cl vs. NO3 • Nirate levels are defined by a linear trend with large variations. This could reflect agricultural practices or sewage effluent. • The locations where NO3 values are 0 ppm and the Cl values read around 4ppm could indicate denitrification.

  7. Cation/Anion Balance • Cations • Na, Ca, Mg, K • Anions • Cl, SO4, NO3, HCO3 • A bit of a charge imbalance weighing heavy on the negative charge. • Cation/Anion balance percent = 7.5% • R2 value of 0.998

  8. Cl vs. Ca, Mg and HCO3

  9. Ca vs. HCO3 • Comparing Ca to HCO3, most of the data points are off of the Ca=HCO3 equivalent line. This would indicate an anion influence and inferring that another cation is necessary to reach a balance.

  10. Ca + Mg vs HCO3 • Ca + Mg plotted as a function of HCO3 • Points are better scattered around the 1:1 line

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