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http://repositoriodigital.ipn.mx/handle/123456789/11453Registro completo de metadatos
| Campo DC | Valor | Lengua/Idioma |
|---|---|---|
| dc.creator | GUZMAN MENDOZA, JOSE | - |
| dc.date | 2012-03-28T22:52:26Z | - |
| dc.date | 2012-03-28T22:52:26Z | - |
| dc.date | 2010-06-15 | - |
| dc.date.accessioned | 2013-01-16T15:33:34Z | - |
| dc.date.available | 2013-01-16T15:33:34Z | - |
| dc.date.issued | 2013-01-16 | - |
| dc.identifier | http://hdl.handle.net/123456789/973 | - |
| dc.identifier.uri | http://www.repositoriodigital.ipn.mx/handle/123456789/11453 | - |
| dc.description | This paper reports arsenic methylation in betaine–nontronite clay–water suspensions under environmental conditions. Two nontronites (<0.05 mm), NAu-1 (green color, Al-enriched) and NAu-2 (brown color, Al-poor, contains tetrahedral Fe) from Uley Mine - South Australia were selected for this study. Betaine (pKa = 1.83) was selected as methyl donor. The reaction between 5 g L−1 clay, 20ppm As(III), and 0.4M betaine at 7≤pH0 ≤9 under anoxic conditions was studied. The presence of nontronite clays were found to favor As(III) conversion to monomethylarsenic (MMA). Arsenic conversion was found to be as high as 50.2 ngMMA/ng As(III)0. Conversion of As was found to be more quantitative in the presence of NAu-2 ((Na0.72) [Si7.55 Al0.16Fe0.29][Al0.34 Fe3.54 Mg0.05] O20(OH)4) than NAu-1 ((Na1.05) [Si6.98 Al0.95Fe0.07][Al0.36 Fe3.61 Mg0.04] O20(OH)4). The inherent negative charge at the nontronite tetrahedral layer stabilizes positively charged organic intermediate-reaction species, thereby leading to decreases in the overall methylation activation energy. The outcome of this work shows that nontronite clays catalyze As methylation to MMA via non-enzymatic pathway(s) under environmental conditions. | - |
| dc.language | en_US | - |
| dc.publisher | ELSEVIER | - |
| dc.subject | Methyl transfer | - |
| dc.subject | Toxicity | - |
| dc.title | Arsenic(III) methylation in betaine–nontronite clay–water suspensions under enviromental conditions | - |
| dc.type | Article | - |
| Aparece en las colecciones: | Doctorado | |
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| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| RESUMEN ARSENIC.docx | 17.5 kB | Microsoft Word XML | Visualizar/Abrir |
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