Aqueous Environmental Geochemistry by Donald Langmuir

By Donald Langmuir

Langmuir presents an intensive presentation of normal chemical concentrations, platforms and methods to aid readers (1) comprehend controls at the chemical caliber of floor and subsurface waters, and (2) distinguish among the usual and the anthropogenic. in contrast to so much authors, whose civil/sanitary engineering backgrounds advertise a extra aquatic chemistry standpoint, LangmuirÕs geology/geochemistry adventure focuses insurance at the chemical interactions among water and geological fabrics. The ebook offers priceless education in utilizing within the geochemical desktop code MINTEQA2 as an crucial problem-solving instrument.

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Deep-well injection is typically into saline groundwaters in sedimentary formations at temperatures of 20 to 150°C, with pressures from 50 to 300 bars (Environmental Protection Agency I990a, I 990b). We will limit discussion in this section to the effect of pressure on reactions, which is usually less important than the coincident temperature effect as discussed previously. If the molar volume of a reaction is independent of pressure (does not change with pressure in the P range of interest), Eq.

718 cal/mol K, compute So for silicic acid. 13. Palmer and Hyde (1993) measured association constants along the liquid water·-water vapor curve from 25 to 300°C for the reaction Fe 2+ + CI- = FeCI t The experimental results are tabulated here. 013407 T The following thermodynamic data are available from the literature for 25°C and I bar total pressure. 56 (a) Compute L'1Gl for the FeCI+ complex at 25°C. 1H~ in kcal/mol for the complexation (association) reaction at 25°C. (e) Compute the entropy of the FeCI+ complex at 25°C.

1982). See also Hersey et al. (1988). 9KI data for oxalic acid is from Robinson and Stokes (1959). The Kz value for 25°C is from McAuley and Nancollas (1961). The temperature function for K2 has been obtained by titting measured values reported by McAuley and Nancollas (op. ). ~ JOHarned and Owen (1958). IISiebert and Hostetler (1977a). 12Busenberg et al. (1984). IlBusenberg and Plummer (1986). 14 Siebert and Hostetler (1977b). 15Langmuir and Melchior (1985). Ksp(gypsum) = K,p(anhydrite) = 10-164 at 56°C.

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