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  • sulphate  (2)
  • 2005-2009
  • 1985-1989  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The geochemistry of two hard water rivers, the Rhine and the Rhone: Part 1: Presentation and screening of data (1985)
    Springer
    Hydrobiologia 126 (1985), S. 3-10 
    Details
    ISSN: 1573-5117
    Keywords: calcium ; bicarbonate ; sulphate ; acidity ; Rhine ; Rhone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Data on the chemical composition of the hard water rivers Rhine and Rhone, published elsewhere, are stored in a new data bank, RRQUE. In this paper the seasonal variation in pH and concentrations of calcium, bicarbonate and sulphate at 7 stations in the Rhine and 7 in the Rhone are described. The concentrations of calcium, bicarbonate and sulphate show important increases with increasing distance from the source. In both rivers acidification gradually occurs downstream and is thought to be caused by the decomposition of disposed organic matter. It is shown that the normal seasonal patterns of these 4 chemical variables are negated by anthropogenic effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008380
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The geochemistry of two hard water rivers, the Rhine and the Rhone: Part 3: The relations between calcium, bicarbonate, sulphate and pH (1985)
    Springer
    Hydrobiologia 126 (1985), S. 21-24 
    Details
    ISSN: 1573-5117
    Keywords: pH ; calcium ; bicarbonate ; sulphate ; Rhine ; Rhone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the hard water rivers Rhine and Rhone the quotient Ca/HCO3 is strongly related to the sulphate concentration and not to the pH. The relationship can be described (by least square analysis) for the Rhine: Ca/HCO3) = 0.70 + 0.5 (SO4), for the Rhone: (Ca/HCO3) = 0.85 + 0.43 (SO4). With a Teissier analysis (reduced major axis) a slope for both rivers of 0.58 has been found. These values equal the theoretically expected value of 0.5, when a solution of CaSO4 is added to a saturated solution of CaCO3. The source of the CaSO4 (gypsum) is thought to be natural in the Rhone and anthropogenic in the Rhine. Acidification of both rivers is probably the result of decomposition of disposed organic matter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008382
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    Paper (German National Licenses)
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