Colloids in water from a subsurface fracture in granitic rock, Grimsel Test Site, Switzerland

Details Colloids in water from a subsurface fracture in granitic rock, Grimsel Test Site, Switzerland Colloids in water from a subsurface fracture in granitic rock, Grimsel Test Site, Switzerland

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..603d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 3, pp.603-610

Physics

5

Scientific paper

The characterization of colloids from the Grimsel Test Site granitic groundwater has been carried out after concentrating the natural colloids by diaultrafiltration in situ and in the laboratory. A 2-year-long study has shown little variation in the chemistry of the Grimsel water ( T = 285 K , pH = 9.6) and a calculation of saturation indices indicates that quartz and fluorite are slightly oversaturated in the in situ conditions ( log P ( CO 2 )/ atm . = -5.5). Scanning electron microscope (SEM) investigations indicate a colloid concentration of approximately 10 10 particles (40 to 1000 nm) per litre. On the basis electron spectroscopy for chemical analysis (ESCA), transmission electron microscopy (TEM), energy dispersive X-ray spectrometry (EDS), electron energy loss spectrometry (EELS), and laser microprobe mass analysis (LAMMA), the particles are a mixture of organic (C, N, O, (S)) and inorganic (Si, Ca, S and to a lesser extent Mg, Sr and Ba) materials. The alpha specific activity in the colloidal phase is less than 0.5 mBq · 1 -1 . The mode of formation is discussed together with the size distribution and the concentration.

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