Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | RELEASE OF ARSENIC FROM VOLCANIC ROCKS TRHOUGH INTERACTION WITH INORGANIC ANIONS AND ORGANIC LIGANDS |
| Abstract | The effects of a number of inorganic anions (F(-), HCO(3) (-), B(OH) (4) (-) , Cl(-), I(-)) and of the siderophore DFO-B on the release of As from volcanic rocks were investigated in batch experiments. While previously reported field and laboratory data support a role of inorganic anions on As mobilization into aquifers, the role of siderophores on As-induced mobilization was less investigated. Fluoride, bicarbonate and DFO-B have shown a significant influence on the release of As from the rocks. Lava was mostly affected among the investigated rocks at pH 6 and 20 degrees C by releasing 4% of its initial As content in the presence of 0.01 M F(-)and 10% in the presence of 500 µM DFO-B. The effect of fluoride was larger at pH 6 than at pH 8.5 for all the rocks. In the case of DFO-B, there was also a larger effect at pH 6 compared to pH 8 for the various rocks except tuff. Bicarbonate played a role under alkaline conditions while its effect was negligible at pH 6. Anion exchange processes in the presence of fluoride and bicarbonate and complexation processes in the presence of the siderophore DFO-B appear to be the major processes responsible for the release of arsenic from the rocks. The siderophore DFO-B plays mainly an indirect role on the As release by complexing Al, Fe and Mn, thus favoring the dissolution of the rocks and the consequent release of As bound to surface Al, Fe and Mn oxy-hydroxides. These findings suggest that ionic interactions with fluoride, bicarbonate and siderophore may be a further triggering factor in the mobilization of As from aquifer rocks. |
| Source | Aquatic geochemistry 16 (3), pp. 373–393 |
| Keywords | Arsenic mobilizationGroundwaterInorganic anions |
| Journal | Aquatic geochemistry |
| Editor | Kluwer Academic Publishers, Dordrecht ;, Paesi Bassi |
| Year | 2010 |
| Type | Articolo in rivista |
| DOI | 10.1007/s10498-010-9090-3 |
| Authors | CASENTINI B. (a); PETTINE M. (a); MILLERO F.J. (b) |
| Text | 42387 2010 10.1007/s10498 010 9090 3 ISI Web of Science WOS 000277134700006 Arsenic mobilization Groundwater Inorganic anions RELEASE OF ARSENIC FROM VOLCANIC ROCKS TRHOUGH INTERACTION WITH INORGANIC ANIONS AND ORGANIC LIGANDS CASENTINI B. a ; PETTINE M. a ; MILLERO F.J. b a Water Research Institute, National Research Council, Via Salaria 29.300, C.P. 10, 00016 Monterotondo, Rome, Italy; b Marine and Atmospheric Chemistry, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, USA The effects of a number of inorganic anions F , HCO 3 , B OH 4 , Cl , I and of the siderophore DFO B on the release of As from volcanic rocks were investigated in batch experiments. While previously reported field and laboratory data support a role of inorganic anions on As mobilization into aquifers, the role of siderophores on As induced mobilization was less investigated. Fluoride, bicarbonate and DFO B have shown a significant influence on the release of As from the rocks. Lava was mostly affected among the investigated rocks at pH 6 and 20 degrees C by releasing 4% of its initial As content in the presence of 0.01 M F and 10% in the presence of 500 µM DFO B. The effect of fluoride was larger at pH 6 than at pH 8.5 for all the rocks. In the case of DFO B, there was also a larger effect at pH 6 compared to pH 8 for the various rocks except tuff. Bicarbonate played a role under alkaline conditions while its effect was negligible at pH 6. Anion exchange processes in the presence of fluoride and bicarbonate and complexation processes in the presence of the siderophore DFO B appear to be the major processes responsible for the release of arsenic from the rocks. The siderophore DFO B plays mainly an indirect role on the As release by complexing Al, Fe and Mn, thus favoring the dissolution of the rocks and the consequent release of As bound to surface Al, Fe and Mn oxy hydroxides. These findings suggest that ionic interactions with fluoride, bicarbonate and siderophore may be a further triggering factor in the mobilization of As from aquifer rocks. 16 Articolo su rivista ISI Aquatic_Geochemistry2010.pdf Articolo in rivista Kluwer Academic Publishers 1380 6165 Aquatic geochemistry Aquatic geochemistry Aquat. geochem. barbara.casentini CASENTINI BARBARA maurizio.pettine PETTINE MAURIZIO TA.P04.021.005 Tendenze evolutive della qualita dei corpi idrici superficiali e sotterranei correlazione causa effetto e caratterizzazione. |