naa a22 4500 510752063 CHVBK 20180411083108.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11270-013-1560-y doi (NATIONALLICENCE)springer-10.1007/s11270-013-1560-y Interaction of Magnesium-Iron-Carbonic-Layered Double Hydroxides with As(III) [Elektronische Daten] [Susanta Paikaray, M. Hendry] Hydrotalcite-like compounds (HTlcs) are of potential environmental significance due to a reactive interlayer that may act as a natural sink during precipitation under ambient conditions or after interaction with contaminants. This study focused on the partitioning of As(III) on MgFeCO3-type HTlcs, in consideration of the predominance of both Mg2+ and Fe3+ in CO2-equilibrated natural settings. Sequestration of As(III) during HTlc precipitation was several orders of magnitude greater compared to interaction with pre-existing HTlc precipitates. This is attributed to the participation of As(III)-oxyanion species in the maintenance of surface charge neutrality during active precipitation. The degree of crystallinity, crystallite size, and interlayer thickness of the Mg-FeCO3-type HTlc all decreased slightly upon As(III) incorporation; metal-metal coordination was largely unaffected. Ambient interaction of the HTlc with As(III) caused CO3 2− incorporation into the interlayer from atmospheric CO2 even in the absence of a dissolved CO3 2− source. The interlayer occupancy of entrapped As(III) constituted a minor fraction of the total mass sequestered, resulting in a low intensity Raman spectral vibration at ∼810cm−1. Minimal changes in the thermal stability due to As(III) incorporation were measured. However, total mass loss occurred through multiple stages in As(III)-incorporated HTlcs compared to pure HTlc due to excess H2O absorption onto the surface and structural incorporation of CO3 2−. Springer Science+Business Media Dordrecht, 2013 Anionic clay nationallicence Arsenite retardation nationallicence Environmental sink nationallicence Natural vs. artificial immobilization nationallicence Reactive interlayer nationallicence Water treatment nationallicence Paikaray Susanta Department of Geological Sciences, University of Saskatchewan, S7N 5E2, Saskatoon, Saskatchewan, Canada aut Hendry M. Department of Geological Sciences, University of Saskatchewan, S7N 5E2, Saskatoon, Saskatchewan, Canada aut Water, Air, & Soil Pollution Springer Netherlands 224/5(2013-05-01), 1-8 0049-6979 224:5<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1560-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1560-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Paikaray Susanta Department of Geological Sciences, University of Saskatchewan, S7N 5E2, Saskatoon, Saskatchewan, Canada aut NATIONALLICENCE 700 1- Hendry M. Department of Geological Sciences, University of Saskatchewan, S7N 5E2, Saskatoon, Saskatchewan, Canada aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/5(2013-05-01), 1-8 0049-6979 224:5<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer