A preliminary study of the chemistry of pore water extracted from tuff by one-dimensional compression

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A specially designed and fabricated one-dimensional compression cell is being used to extract water from nonwelded and densely welded tuffs having degrees of saturation greater than 16 and 37 percent respectively. Chemical analyses of pore water obtained at increasing pressures are used to evaluate possible changes in chemistry caused by compression. The extracted pore water varies form a calcium chloride type to a sodium bicarbonate type. The mean concentration of dissolved ions generally decreases during compression. The relative abundance of the major cations varies little with increasing pressure. Possible causes of the pore-water-chemistry changes include: (1) dilution of pore water ... continued below

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6 p.

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Kharaka, Y.K.; Maest, A.S.; Peters, C.A.; Yang, I.C.; Higgins, J.D. & Burger, P.A. October 1, 1992.

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Description

A specially designed and fabricated one-dimensional compression cell is being used to extract water from nonwelded and densely welded tuffs having degrees of saturation greater than 16 and 37 percent respectively. Chemical analyses of pore water obtained at increasing pressures are used to evaluate possible changes in chemistry caused by compression. The extracted pore water varies form a calcium chloride type to a sodium bicarbonate type. The mean concentration of dissolved ions generally decreases during compression. The relative abundance of the major cations varies little with increasing pressure. Possible causes of the pore-water-chemistry changes include: (1) dilution of pore water by low ionic strength adsorbed water from zeolites and clays; (2) dissolution reactions caused by the increase in dissolved carbon dioxide concentrations that may result from pressurization; (3) membrane filtration by zeolites and clays; and (4) ion exchange with the zeolites and clays.

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6 p.

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INIS; OSTI as DE92040952

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  • 7. water-rock interaction conference, Park City, UT (United States), 9-23 Jul 1992

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  • Other: DE92040952
  • Report No.: CONF-920761--15
  • Grant Number: AI08-92NV10874
  • Office of Scientific & Technical Information Report Number: 138460
  • Archival Resource Key: ark:/67531/metadc618977

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  • October 1, 1992

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  • June 16, 2015, 7:43 a.m.

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  • April 18, 2016, 6:48 p.m.

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Kharaka, Y.K.; Maest, A.S.; Peters, C.A.; Yang, I.C.; Higgins, J.D. & Burger, P.A. A preliminary study of the chemistry of pore water extracted from tuff by one-dimensional compression, article, October 1, 1992; Denver, Colorado. (digital.library.unt.edu/ark:/67531/metadc618977/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.