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Geochemical speciation

Geochemical speciation calculations suggest that Sb occurs predominantly as Sb(lll) throughout the tailings pore-waters and that Sb concentrations are limited by the precipitation of common Sb(lll) minerals, such as sernamontite (Sb203, reaction 1). [Pg.316]

Geochemical speciation modelling indicated saturation with respect to gypsum and several carbonates, slight under-saturation with respect to calcium arsenate (Ca3[As04]2) and ferrihydrite. [Pg.369]

The results of this study are in agreement with previous studies. Lindsay (1979) suggested that precipitation of CaF2 mineral could limit the solubility of I in calcareous soils. Reddy and Gloss (1993) studied geochemical speciation as related to the mobility of F in soil water extracts of semi-arid environments. In their study, surface and subsurface soil samples were extracted with distilled deionized water... [Pg.348]

Fig. 15.5. Calculated metal sorption curves for Pb, Cu and Cd onto the bacterium Bacillus subtilis, shown as a function of pH versus the concentration of sorbed metal. Curves are calculated based on experimental metal sorption data of Fein et al. (1997), and were computed using the geochemical speciation programme JCHESS. The solution depicted contains 1 g 1 bacteria dry wt (155 m g surface area, 8.0 Cm electrical double layer capacitance), 1 mM dissolved CaC03 and 1 iM dissolved lead, copper and cadmium. Adsorption was calculated using a CCM treatment. Fig. 15.5. Calculated metal sorption curves for Pb, Cu and Cd onto the bacterium Bacillus subtilis, shown as a function of pH versus the concentration of sorbed metal. Curves are calculated based on experimental metal sorption data of Fein et al. (1997), and were computed using the geochemical speciation programme JCHESS. The solution depicted contains 1 g 1 bacteria dry wt (155 m g surface area, 8.0 Cm electrical double layer capacitance), 1 mM dissolved CaC03 and 1 iM dissolved lead, copper and cadmium. Adsorption was calculated using a CCM treatment.
Application of geochemical speciation mass-transfer models... [Pg.4691]

Runde W., Neu M. P., Condrdson S. D., Ei J., Ein M., Smith D. M., Van-Pelt C. E., and Xu Y. (2002b) Geochemical speciation of radionuclides in soil and solution. In Geochemistry of Soil Radionuclides. SSSA Special Publication Number 59 (eds. P. Zhang and P. Brady). Soil Science Society of America, Madison, Wisconsin, pp. 45-60. [Pg.4800]

Allison, J. D., and Brown, D. S. (1995). M1NTEQA2/PRODEFA2 a geochemical speciation model and interactive preprocessor. In Chemical Equilibrium and Reaction Models, ed. Loeppert, R. H., Schwab, A. P., and Goldberg, S., Soil Science Society of America, Madison, WI, 241-252. [Pg.452]

Allison, J.D. Brown, D.S. (1995) MINTEQA2/PROGEGA - A geochemical speciation model and interactive processor. In R.H. Loeppert etal. (ed.), Chemical equilibria and reaction models. Soil Set Soc. Am. Spec. Pub. Madison, WI. 241-252. [Pg.128]

Wolery, T.J. E03NR. A Computer Program for Geochemical Speciation-Solubilitv Calculations. User s Guide and Documentation. UCRL-5314, 1983. [Pg.12]

In Appendix 5, a geochemical speciation package (MinteqA2) mas used to characterise the electrolyte systems used in the experiments. Kesults are shown as a Junction ofpHfor the carbonate buffer, sodium, and calcium. [Pg.357]

MinteqA2 is a geochemical speciation code which was released by the U.S. EPA. Version 3.11 was used in this study. The software is available on the internet from the U.S. EPA Center for Exposure Assessment and Modeling (CEAM) as are several manuals (Allison etal. (1991)). [Pg.358]

Figure 2.2. Comparison of ion activity products with the solubility product of wulfenite (lead molybdate) in soil solutions from Laramie Basin, Wyoming. [Reprinted from Applied Geochemistry Supplement), vol. 2, K. J. Reddy and S. P. Gloss Geochemical speciation as related to the mobility of F, Mo and Se in soil leachates, pp. 159-63. Copyright 1993, with kind permission from Elsevier Science Ltd., The Boulevard, Langford Lane, Kidlington 0X5 1GB, United Kingdom.]... Figure 2.2. Comparison of ion activity products with the solubility product of wulfenite (lead molybdate) in soil solutions from Laramie Basin, Wyoming. [Reprinted from Applied Geochemistry Supplement), vol. 2, K. J. Reddy and S. P. Gloss Geochemical speciation as related to the mobility of F, Mo and Se in soil leachates, pp. 159-63. Copyright 1993, with kind permission from Elsevier Science Ltd., The Boulevard, Langford Lane, Kidlington 0X5 1GB, United Kingdom.]...
Data selections can be exported into a file to be used in other geochemical speciation or reactive transport codes. Then, the output format will automatically be adapted to the specific requirements of the different software packages. [Pg.92]

Geochemical Speciation Does it Help to Assess and Engineer the Impact of Metals 27... [Pg.27]

To include sector or site-specific geochemical speciation data into the design of environmental engineering measures (e.g. liming, drainage, solidification, landfill waste disposal, effluent treatment)... [Pg.31]

To use geochemical speciation procedures in combination with bioassays and epidemiological data... [Pg.31]

See other pages where Geochemical speciation is mentioned: [Pg.74]    [Pg.84]    [Pg.368]    [Pg.123]    [Pg.353]    [Pg.363]    [Pg.367]    [Pg.4580]    [Pg.4726]    [Pg.4727]    [Pg.99]    [Pg.214]    [Pg.169]    [Pg.519]    [Pg.16]    [Pg.21]    [Pg.44]    [Pg.551]    [Pg.80]    [Pg.81]    [Pg.83]    [Pg.85]    [Pg.86]    [Pg.87]    [Pg.88]    [Pg.89]    [Pg.91]   
See also in sourсe #XX -- [ Pg.25 , Pg.26 , Pg.27 , Pg.28 , Pg.29 , Pg.30 ]



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