Excerpt / Summary All concentrations in milligrams/liter. TDS is total dissolved solids and pH is a measure of the acidity of the water. A pH less than 7 is acidic. A dash (-) indicates that the component was not detected or the water was not analyzed for this constituent. A tilde (~) means "approximately." Key to Analyses: (1) Rainwater from Menlo Park, California; (2) Average rainwater from sites in North Carolina and Virginia; (3) Composition of the Rhine River as it leaves the Alps; (4) Stream draining igneous rocks in the Washington Cascades; (5) Jump-Off Joe Creek, southwestern Oregon, wet season, November, 1990; (6) Jump-Off Joe Creek, southwestern Oregon, dry season, September, 1991; (7) Great Salt Lake, Utah; (8) Average seawater; (9) Groundwater from limestone of the Supai Formation, Grand Canyon; (10) Groundwater from volcanic rocks, New Mexico; (11) Groundwater from a spring, Sierra Nevada Mountains: short residence time; (12) Groundwater from metamorphic rocks in Canada: long residence time. 1 2 3 4 5 6 7 8 9 10 11 12 Calcium 0.8 0.65 40.7 1.68 14 22 241 400 144 6.5 3.11 4540 Magnesium 1.2 0.14 7.2 0.24 13 17 7200 1350 55 1.1 0.7 160 Sodium 9.4 0.56 1.4 0.16 8 14 83,600 10,500 ~27 ~37 3.03 2740 Potassium - 0.11 1.2 0.31 - 0.5 4070 380 ~2 ~3 1.09 32.1 Bicarbonate 4 - 114 5.4 104 129 251 28 622 77 20 55 Sulfate 7.6 2.2 36 1.3 4.7 1.3 16,400 185 60 15 1.0 1 Chloride 17 0.57 1.1 0.06 8.5 33 140,000 19,000 53 17 0.5 12,600 Silica 0.3 - 3.7 0.7 24 30 48 3 22 103 16.4 8.5 TDS 38 4.7 207 10 120 180 254,000 35,000 670 222 36 20,338 pH 5.5 - - 6.9 7.7 7.0 7.4 - - 6.7 6.2 6.5
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