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44 <br />i 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 />• <br /> are given in,Table VI. They represent a complete elemental <br /> analysis; the only important anion is SO4 Conductivity <br /> at 25°C, 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/Q. 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 /> <br /> point out problem areas.