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

Conference ·
OSTI ID:138460
;  [1]; ;  [2];  [3];  [4]
  1. eds.; Geological Survey, Menlo Park, CA (United States)
  2. Geological Survey, Denver, CO (United States)
  3. Colorado School of Mines, Golden, CO (United States)
  4. Bureau of Reclamation, Denver, CO (United States)
+ Show Author Affiliations
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.
Research Organization:
Geological Survey, Denver, CO (United States)
Sponsoring Organization:
USDOE, Washington, DC (United States)
DOE Contract Number:
AI08-92NV10874
OSTI ID:
138460
Report Number(s):
CONF-920761--15; ON: DE92040952
Country of Publication:
United States
Language:
English

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Related Subjects

05 NUCLEAR FUELS
54 ENVIRONMENTAL SCIENCES
CARBON DIOXIDE
CHEMICAL ANALYSIS
CLAYS
COMPRESSION
DILUTION
DISSOLUTION
GROUND WATER
HIGH-LEVEL RADIOACTIVE WASTES
ROCK-FLUID INTERACTIONS
TRACE AMOUNTS
TUFF
UNDERGROUND FACILITIES
YUCCA MOUNTAIN
Yucca Mountain Project
ZEOLITES