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<br />^ ,.., <br />26'S' <br />Tabla 2, Statistical summary of dissolved-solids and major-ion concentrations in Pueblo Reservoir, 1986 through 1989 <br /> <br />[All concentrations are in milligrams per liter) <br /> Samplln9 Number ot Standard Twenty- Saventy- <br />Conetltuent alte' anatyses MeRn deviation fifth Median filth <br /> percentile percentile <br />Dissolved solids 38 44 26\ &5.3 2M 25\ 33& <br /> 5C 44 257 55,8 225 256 303 <br /> 78 41 269 50.4 233 271 317 <br />CaJcium 38 46 51 13.7 40 50 62 <br /> 5C 42 49 85 43 48 56 <br /> 78 44 52 8,1 47 52 59 <br />Magnesium 38 46 14 5,6 10 13 18 <br /> 5C 40 13 3.6 10 12 15 <br /> 78 44 14 2,9 12 14 17 <br />Sodium 38 46 19 7,9 15 18 25 <br /> 5C 40 17 4.6 14 18 21 <br /> 78 44 19 4,7 16 20 22 <br />Potassium 38 46 2.8 0,91 2,3 2,8 3.5 <br /> 5C 42 2,6 0.57 2.2 2.6 3,0 <br /> 78 44 2,7 0.49 2,3 2,9 3,2 <br />Bicarbonate 38 22 132 35,3 94 140 164 <br /> 5C 21 106 20.6 110 131 149 <br /> 78 22 129 21.2 108 134 144 <br />Sulfate 38 48 101 43,4 73 91 124 <br /> 5C 48 99 28,7 83 97 117 <br /> 78 43 106 27.3 84 104 126 <br />Chloride 38 46 6,6 2,3 5,0 6,2 8,4 <br /> 5C 42 6,0 1.6 5,1 5,9 7,1 <br /> 78 44 6,5 1.6 5,0 6.3 8.2 <br />I Sampling sire location shown in plate 1. <br />the result of uptake of C02 during pholosynthesis by through April, when streamtlows are low. Major-ion <br />phytoplankton near the reservoir surface (Palmer, concentrations of reservoir water samples during May <br />]977). through August were smaller than those during Sep- <br />Differences between major-ion concentrations of tember through April at sites 3B, SC, and 7B. Most of <br />reservoir water samples collected in 1986 through] 989 the differences in seasonal concentrations at sites 3B <br />during May through August and those collected during and SC are statistically significant when measured with <br />September through April were evaluated 10 detennine the Mann-Whitney statistical test (table 4). However. <br />if major-ion concentrations vary seasonally (table 4). the seasonal differences in major-ion concentrations at <br />Large streamtlows in the Arkansas River during May site 78 generally were not statistically significant pos- <br />through August resull in smaller major-ion concentra- sib]y because of mixing induced by fall turnover or res- <br />tions entering the reservoir than during September ervoir withdrawals. <br /> <br />28 Phyalcel, Chemical, end Biological Characteristics of Pueblo Res.rvo1r, Colorado, 1985-89 <br />