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The bromide will be introduced into the mine workings as either sodium bromide or <br /> potassium bromide solution sprayed on mine walls. The solubility of sodium bromide <br /> in water is 1 160 grams per liter (at 500 C) and the solubility of potassium bromide at <br /> 0° C is 534.8 grams per liter (Weast and Astle, 1979 pp. B-109 and.B-124). The <br /> solubility is somewhat greater for warm water. The solubility of either compound is <br /> three orders of magnitude greater than anticipated concentrations and the bromide will <br /> certainly dissolve in rising mine waters in the event that the water evaporates from the <br /> initially applied solution. <br /> 7.0 BROMIDE WILL REMAIN IN SOLUTION <br /> Bromide is a halide. Other common halides include chloride, fluoride, and iodide. <br /> Most halide compounds are saltlike compounds, and, like table salt (sodium chloride), <br /> are very soluble in water. Very few halides are insoluble, and bromide especially tends <br /> to be soluble. <br /> In ground water there is a natural evolution, as water ages, from bicarbonate as the <br /> dominant anion, to sulfate as the dominant anion, to chloride as the dominant anion <br /> (Freeze and Cherry, 1979, p. 242). The sequence is caused by the combination of <br /> mineral availability and mineral solubility. Bicarbonate and sulfate are more common <br /> than halides (predominantly Cl-, but also including Br-). However, once Cl- or Br" go <br /> into solution they tend to stay there. <br /> 1AADMINMMIANE\BROMIDE.RPT 5 <br /> 88l HYDRO-SEARCHAG A Tetra Tech Company <br />