Advances in Arsenic Research. Integration of Experimental by Peggy A. O'Day, Dimitrios Vlassopoulos, Xiaoguang Meng,

By Peggy A. O'Day, Dimitrios Vlassopoulos, Xiaoguang Meng, Liane G. Benning

The belief over the last decade that many water provides around the globe are stricken by arsenic at concentrations above applicable wellbeing and fitness degrees has influenced learn directed at realizing the incidence, distribution, and mobilization of arsenic within the atmosphere, and prompted the improvement of recent, in your price range therapy applied sciences. Arsenic accumulation and migration is heavily tied to its chemical speciation, that is frequently managed via a fancy blend of abiotic and biotic tactics coupled with actual delivery. This symposium quantity makes a speciality of bridging the space among assorted ways and scales of research and on fostering a extra unified knowing of arsenic prevalence and behaviour, together with geological, geochemical, hydrological, microbiological, ecological, and engineering points of arsenic-related examine. Papers during this quantity spotlight a number of new examine directed at knowing the assets, distribution, and mobilization of arsenic within the setting. It comprises fresh efforts within the improvement of most economical remedy applied sciences and in methods to usual attenuation and sped up remediation equipment. those themes are thematically geared up into 3 sections within the quantity, the 1st concentrating on laboratory experiences and theoretical modeling, the second one on arsenic habit and biking in more than a few box settings, and the 3rd on reports linked to remedy and remediation applied sciences and techniques. This publication is concentrated at scientists and engineers (chemists, geochemists, geologists, hydrogeologists, microbiologists, molecular biologists, chemical engineers, environmental engineers) in addition to graduate scholars who're engaged in study on arsenic in either ordinary and engineered aqueous structures, and at the improvement of equipment for arsenic therapy and removal.

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1995, 29, 1898-1905. E. Soil Sci. 1998, 163, 278-287. Manning, Β. ; Goldberg, S. Environ. Sci. Technol. 1997, 31, 2005-2011. K. J. Environ. Qual. 1980, 9, 700-703. K. Clays Clay Miner. 1981, 29, 219225. L. Am. Chem. Soc. Symp. Ser. 2003, No. 835, 57-69. ; ACS Symposium Series; American Chemical Society: Washington, DC, 2005. ch004 1 1,2 3 1,4 L. Charlet , S. Chakraborty , S. Varma , C. Tournassat , M. Wolthers , D. Chatterjee , and G. Roman Ross 1 2 1 1 Environmental Geochemistry Group, LGIT-OSUG, University of Grenoble, BP 53, F-38041 Grenoble, Cedex 9, France Department of Chemistry, University of Kalyani, Kalyani 741 235, West Bengal, India Institute of Physics, Bhubaneswar 751005, India Current address: BRGM, BP 6009, F-45060 Orléans, Cedex 2, France 2 3 4 The Bengal Delta Plain (BDP) shallow aquifer is extensively used for public water supply but is severely polluted with naturally occurring arsenic, threatening the health of millions of people.

Most iron (hydr)oxides show net negative charge at pH > 10, and it is reasonable to assume that C G R particles would also be negatively charged at pH > 10. Because charge repulsion between C G R surface and the more negatively charged HAs0 " and As0 " anions would be greater than charge repulsion between C G R surface and the less negatively charged H As0 " anion and the neutral H A s 0 molecule, less As(V) would be sorbed than As(III) by C G R at alkaline pH. Additionally, As(III) ions should have a greater tendency to migrate into the interlayers of C G R to replace carbonate ions because of the similarities between the molecular structure of HAs0 " and that of C 0 " (both have three oxygen atoms and show pyramidal molecular configuration).

S. E P A Environ. Res. Brief, EPA/600/S-02/001, 2002. ; Abdelmoula, M . ; Herbillon, A. Geochim. Cosmochim. Acta 1997, 61, 1107-1111. Scheidegger, A . M . J. Phys. IV France 2003, 104, 417-420. E. Science 1997, 278, 1106-1109. ; Ragnarsdottir, Κ. V . Geochim. Cosmochim. Acta 2001, 65, 1015-1023. ; Mackay. Clay Miner. Bull. 1959, 4, 15-30. ; Abdelmoula, M . R. Corrosion Sci. 1995, 37, 2025-2041. Sposito, G. The Chemistry of Soils; Oxford University Press: New York, 1989. W. Adv. Environ. Res. 2003, 7, 825-834.

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