| Abstract: | Retention of CO2 on three air-dried and partly water-saturated glacial and eolian sediments was measured at 20??C for a range in, PCO2 that commonly occurs in unsaturated zones. Ratios of the relative losses of CO2 and 14CO2 from a surrogate atmosphere overlying the sediments were 1:1 for the dry condition. For the wet condition, those relative losses were generally {precedes above single-line equals sign} 1:2, indicating bicarbonateion formation and C-isotope exchange. Mass losses of CO2 per surface area of sediment were similar for dry and wet conditions; however, CO2 losses for the wet condition were 8 to 17 times greater than losses predicted by calcite equilibria. Occurrence of this comparatively large reservoir of immobile, exchangeable C in unsaturated zones can cause alteration of the C-isotope composition of soil CO2 and of dissolved inorganic C in interstitial water, and needs to be considered when modeling 14CO2 movement in the unsaturated zone or when interpreting radiocarbon ages of infiltrating water. ?? 1990. |
| Genre: | Article |
| ProdID: | 70015980 |
| Citation Author: | Striegl, R. G.; Armstrong, D. E. |
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| Citation End Page: | 2283 |
| Citation Issue: | 8 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geochimica et Cosmochimica Acta |
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| Citation Number Of Pages: | 7 |
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| Citation Search Results Text: | Carbon dioxide retention and carbon exchange on unsaturated Quaternary sediments; 1990; Article; Journal; Geochimica et Cosmochimica Acta; Striegl, R. G.; Armstrong, D. E. |
| Citation Start Page: | 2277 |
| Citation Volume: | 54 |
| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | Carbon dioxide retention and carbon exchange on unsaturated Quaternary sediments; 1990; Article; Journal; Geochimica et Cosmochimica Acta; Striegl, R. G.; Armstrong, D. E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1990 00:00 -0600 |
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