| Abstract: | Saturation indices computed with WATEQ4F for chemical analyses from a groundwater in crystalline bedrock and a surface water receiving acid mine drainage are frequently at or above saturation with respect to calcite, fluorite, barite, gibbsite and ferrihydrite. A sensitivity analysis has been performed by varying the analytic and thermodynamic parameters for which the saturation indices are most sensitive. For calcite, fluorite and barite, the supersaturation effect appears to be real because it is only slightly decreased by sources of uncertainty. Apparent supersaturation for gibbsite is most likely caused by the degree of crystallinity on solubility behavior. Apparent supersaturation for ferric hydroxide is likely caused by small colloidal particles (<0.1 ??m) in the water sample that cannot be removed by standard field filtration, although several other possible explanations cannot be easily excluded. -from Authors |
| Genre: | Article |
| ProdID: | 70015431 |
| Citation Author: | Nordstrom, D. K.; Ball, J. W. |
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| Citation End Page: | 280 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Sciences Geologiques - Bulletin |
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| Citation Number Of Pages: | 12 |
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| Citation Search Results Text: | Mineral saturation states in natural waters and their sensitivity to thermodynamic and analytic errors; 1989; Article; Journal; Sciences Geologiques - Bulletin; Nordstrom, D. K.; Ball, J. W. |
| Citation Start Page: | 269 |
| Citation Volume: | 42 |
| Citation Year: | 1989 |
| Type: | citation/reference |
| Text: | Mineral saturation states in natural waters and their sensitivity to thermodynamic and analytic errors; 1989; Article; Journal; Sciences Geologiques - Bulletin; Nordstrom, D. K.; Ball, J. W. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1989 00:00 -0600 |
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