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44 <br />• <br />• <br />0.01 mole/liter solution of KC1. The change is about 2% for <br />every 1°C change. Consequently, conductivities are corrected <br />to a standard 25°C. This can be done by taking the measure- <br />ment at 25°C, or also by using a correction factor based on <br />the specific conductance of KC1 at various temperatures (see <br />the Appendix). The next requirement for extended use of con- <br />ductivity data is that total dissolved solids and complete <br />cation and anion analyses be performed on the waters so <br />that correlations can be made with the conductivity data. <br />This procedure for a Front Range mine effluent is described <br />below. A similar study was made by McWhorter and coworkers <br />(36) on mine drainages in Colorado. <br />The analyses of Argo water from Spring and Summer 1978 <br />are given in,Table VI. They represent a complete elemental <br />analysis; the only important anion is S04 Conductivity <br />at 251C, total dissolved solids determined as a sum of anions <br />and cations, and total dissolved solids determined by analysis <br />(14) closely correlate. In fact, Ramirez (35) found that <br />for mine drainage waters there is alomst a perfect 1:1 cor- <br />relation between conductivity at 25°C expressed in Umho/cm <br />and total dissolved solids expressed in mg/k. Figure 9 <br />is a summary of his results for waters varying from pH's be- <br />tween 2.5 and 7.0 (35). The results have two implications: <br />1. In a gross sense conductivity and pH will give a <br />sensitive indication of the load of dissolved ions <br />in mine drainge waters. This is usually enough to <br />point out problem areas. <br />•