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<br />2S11 <br /> <br />Table 2.--Relations between specific conductance and major ions for surEace- <br />water stations along the Arkansas River between Canon City and Pueblo <br /> <br />Sta tion <br />number <br /> <br />Station <br />name <br /> <br />07096000 Arkansas <br />River at <br />Canon <br />City <br /> <br />07097000 Arkansas <br />River at <br />Portland <br /> <br />07099200 Arkansas <br />River <br />near <br />Portland <br /> <br />07099400 Arkansas <br />River <br />above <br />Pueblo <br /> <br />[from Cain, 1987) <br /> <br />Ion <br /> <br />Calcium <br />Magnesium <br />Sodium <br />Bicarbonate <br />Chloride <br />Sulfate <br /> <br />Calcium <br />Magnesium <br />Sodium <br />Bicarbonate <br />Chloride <br />Sulfate <br /> <br />Calcium <br />Magnesium <br />Sodium <br />Bicarbonate <br />Chloride <br />Sulfate <br /> <br />Calcium <br />Magnesium <br />Sodium <br />Bicarbonate <br />Chloride <br />Sulfate <br /> <br />Number <br />of <br />va lues <br /> <br />104 <br />104 <br />104 <br />104 <br />104 <br />104 <br /> <br />22 <br />22 <br />22 <br />22 <br />22 <br />22 <br /> <br />171 <br />171 <br />171 <br />171 <br />171 <br />171 <br /> <br />56 <br />56 <br />56 <br />56 <br />56 <br />56 <br /> <br />Regression <br />coefficients <br />in the equation <br />ion = a + b(SC)l <br />a b <br /> <br />2.45 <br />-1.25 <br />-3.75 <br />-10.29 <br />-3.33 <br />3.37 <br /> <br />6.25 <br />-1.39 <br />-3.27 <br />31. 42 <br />-1.50 <br />-14.61 <br /> <br />2.24 <br />-3.13 <br />-5.26 <br />36.28 <br />-1. 84 <br />-44.90 <br /> <br />7.60 <br />-3.84 <br />-9.98 <br />57.97 <br />-2.53 <br />-70.51 <br /> <br />0.114 <br />.036 <br />.054 <br />.501 <br />.036 <br />.098 <br /> <br />.096 <br />.035 <br />.057 <br />.228 <br />.022 <br />.264 <br /> <br />0.109 <br />.041 <br />.057 <br />.219 <br />.020 <br />.349 <br /> <br />.099 <br />.044 <br />.066 <br />.177 <br />.020 <br />.405 <br /> <br />Coeffi- <br />cient <br />of deter- <br />mina tion <br />(r2) <br /> <br />0.93 <br />.71 <br />.94 <br />.97 <br />.70 <br />. 73 <br /> <br />.93 <br />.81 <br />.93 <br />.83 <br />.82 <br />.92 <br /> <br />0.95 <br />.92 <br />.92 <br />.86 <br />.84 <br />.94 <br /> <br />.92 <br />.89 <br />.94 <br />.79 <br />.89 <br />.96 <br /> <br />Standard <br />e r ro r <br />(percent) <br /> <br />6.5 <br />18.7 <br />8.9 <br />5.0 <br />24.9 <br />13.6 <br /> <br />7.7 <br />16.8 <br />9.9 <br />11.5 <br />17.5 <br />10.6 <br /> <br />7.2 <br />11.2 <br />11.3 <br />9.9 <br />16.9 <br />10.7 <br /> <br />8.4 <br />13.3 <br />10.7 <br />10.9 <br />14.4 <br />9.5 <br /> <br />lIon equals ion concentration in milligrams per liter. SC equals <br />specific conductance in microsiemens per centimeter at 25 oe. <br /> <br />21 <br />