## 4 Results
### Brine Evolution
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & **Pure Brine (mg/L)** & **Brine Post Test** & **Brine Post Test** & **Brine Post Test** & **Brine Post Test** \\  & & **(mg/L)** & **(mg/L)** & **(mg/L)** & **(mg/L)** \\ \cline{2-6}  & **0 Days** & **1 Day** & **4 Days** & **16 Days** & **64 Days** \\ \hline Na\({}^{+}\) & \(854.5\times 10^{3}\) & \(67.11\times 10^{3}\) & \(860.2\times 10^{3}\) & \(84.05\times 10^{3}\) & \(79.68\times 10^{3}\) \\  & \(\pm\) \(11.96\times 10^{3}\) & \(\pm\) \(93.96\times 10^{3}\) & \(\pm\) \(12.20\times 10^{3}\) & \(\pm\)\(11.77\times 10^{3}\) & \(\pm\)\(11.16\times 10^{3}\) \\ \hline K\({}^{+}\) & \(260\pm 31\) & \(260\pm 31\) & \(305\pm 37\) & \(310\pm 37\) & \(415\pm 50\) \\ \hline Mg\({}^{2+}\) & \(560\pm 100\) & \(590\pm 106\) & \(590\pm 106\) & \(610\pm 109\) & \(680\pm 122\) \\ \hline Ca\({}^{2+}\) & \(2050\pm 205\) & \(1900\pm 190\) & \(1890a\pm 189\) & \(1860\pm 186\) & \(1650\pm 165\) \\ \hline SQ\({}^{2-}\) & \(5400\pm 756\) & \(5400\pm 756\) & \(5600\pm 784\) & \(5700\pm 798\) & \(5300\pm 742\) \\ \hline Cl\({}^{-}\) & \(13.35\times 10^{4}\) & \(10.40\times 10^{4}\) & \(13.3010^{4}\) & \(12.40\times 10^{4}\) & \(11.90\times 10^{4}\) \\  & \(\pm\) \(1.6\times 10^{4}\) & \(\pm\) \(1.3\times 10^{4}\) & \(\pm\)\(1.6\times 10^{4}\) & \(\pm\)\(1.5\times 10^{4}\) & \(\pm\)\(1.4\times 10^{4}\) \\ \hline HCO\({}^{-}\)\({}_{3}\) & \(40\pm 4.0\) & \(35\pm 3.5\) & \(38\pm 3.8\) & \(35\pm 3.5\) & \(33\pm 3.3\) \\ \hline Fe (total) & \(5.2\pm 0.3\) & \(6\pm 0.3\) & \(11.3\pm 0.6\) & \(18.9\pm 0.9\) & \(26.4\pm 1.3\) \\ \hline NO\({}^{-}\)\({}_{3}\) & \(0\) & \(0\) & \(0\) & \(0\) & \(0\) \\ \hline SiO\({}_{2}\) & \(11.5\pm 1.2\) & \(20\pm 2.8\) & \(24.9\pm 3.5\) & \(39\pm 5.5\) & \(37\pm 5.2\) \\ \hline pH (pH Unit.) & \(6.9\pm 0.2\) & \(4.5\pm 0.1\) & \(4.9\pm 0.1\) & \(5.1\pm 0.2\) & \(5.5\pm 0.2\) \\ \hline Cond (mS/cm) & 80,000 & 85,000 & 80,000 & 75,000 & 75,000 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Chemical analysis of pure brine and brine taken from the reaction chambers (one, four, 16 and 64 days) for Experiment 1 with CG (Figure S1 as supplementary material). \begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & **Pure Brine (mg/L)** & **Brine Post Test** & **Brine Post Test** & **Brine Post Test** & **Brine Post Test** \\  & & **(mg/L)** & **(mg/L)** & **(mg/L)** & **(mg/L)** \\ \cline{2-6}  & **0 Days** & **1 Day** & **4 Days** & **16 Days** & **64 Days** \\ \hline Na\({}^{+}\) & \(87.61\times 10^{3}\) & \(10.25\times 10^{3}\) & \(99.72\times 10^{3}\) & \(10.70\times 10^{3}\) \(\pm\) & \(78.54\times 10^{3}\) \(\pm\) \\  & \(\pm\) \(12.26\times 10^{3}\) & \(\pm\)\(14.35\times 10^{3}\) & \(\pm\)\(13.96\times 10^{3}\) & \(14.98\times 10^{3}\) & \(11.00\times 10^{3}\) \\ \hline K\({}^{+}\) & \(235\pm 28.2\) & \(250\pm 30\) & \(240\pm 28.8\) & \(270\pm 32.4\) & \(275\pm 33\) \\ \hline Mg\({}^{2+}\) & \(580\pm 116\) & \(560\pm 112\) & \(560\pm 112\) & \(580\pm 116\) & \(600\pm 120\) \\ \hline Ca\({}^{2+}\) & \(1520\pm 152\) & \(1640\pm 164\) & \(1680\pm 168\) & \(1660\pm 166\) & \(1650\pm 165\) \\ \hline SO\({}_{4}\)\({}^{2-}\) & \(6900\pm 966\) & \(7200\pm 1008\) & \(7300\pm 1022\) & \(7600\pm 1064\) & \(6400\pm 896\) \\ \hline Cl\({}^{-}\) & \(9.70\times 10^{4}\) & \(11.70\times 10^{4}\) & \(12.70\times 10^{4}\) & \(11.20\times 10^{4}\) & \(11.10\times 10^{4}\) \\  & \(\pm\) \(1.2\times 10^{4}\) & \(\pm\)\(1.4\times 10^{4}\) & \(\pm\)\(1.5\times 10^{4}\) & \(\pm\)\(1.3\times 10^{4}\) & \(\pm\)\(1.3\times 10^{4}\) \\ \hline HCO\({}^{-}\)\({}_{3}\) & \(40\pm 4.0\) & \(40\pm 4\) & \(50\pm 5\) & \(110\pm 11\) & \(100\pm 10\) \\ \hline NO\({}^{-}\)\({}_{3}\) & \(0\) & \(0\) & \(0\) & \(0\) & \(0\) \\ \hline FeO & \(8.0\pm 0.8\) & \(10\pm 1\) & \(39\pm 3.9\) & \(59\pm 5.9\) & \(19\pm 1.9\) \\ \hline pH & \(7\pm 0.2\) & \(5\pm 0.2\) & \(5.2\pm 0.2\) & \(5.4\pm 0.2\) & \(5.6\pm 0.2\) \\ \hline Cond. (mS/cm) & 80,000 & 77,500 & 77,000 & 77,000 & 80,00 Ca\({}^{2+}\) tended to stabilize.