http://www.cnr.it/ontology/cnr/individuo/prodotto/ID294210

Dissolution study of tremolite and anthophyllite: PH effect on the reaction kinetics (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Dissolution study of tremolite and anthophyllite: PH effect on the reaction kinetics (Articolo in rivista) (literal)

Anno

2014-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1016/j.apgeochem.2014.06.009 (literal)

Alternative label

Rozalen M.; Ramos M.E.; Gervilla F.; Kerestedjian T.; Fiore S.; Huertas F.J. (2014)
Dissolution study of tremolite and anthophyllite: PH effect on the reaction kinetics
in Applied geochemistry; PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD (Regno Unito)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Rozalen M.; Ramos M.E.; Gervilla F.; Kerestedjian T.; Fiore S.; Huertas F.J. (literal)

Pagina inizio

46 (literal)

Pagina fine

56 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://www.sciencedirect.com/science/article/pii/S088329271400136X# (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

49 (literal)

Rivista

Applied geochemistry (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

11 (literal)

Note

ISI Web of Science (WOS) (literal)
Scopu (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Instituto Andaluz de Ciencias de la Tierra - IACT (CSIC-University of Granada), Avda. de las Palmeras 4, Armilla, Granada, 18100, Spain; Departamento de Mineralogía y Petrología, University of Granada, Avda. Fuentenueva 2, Granada, 18002, Spain; Geological Institute, Bulgarian Academy of Sciences, 24 Georgi Bonchev Str., Sofia, 1113, Bulgaria; Istituto di Metodologie per l'Analisi Ambientale - IMAA (CNR), Tito Scalo, Italy (literal)

Titolo

Dissolution study of tremolite and anthophyllite: PH effect on the reaction kinetics (literal)

Abstract

The effect of pH on the kinetics of tremolite and anthophyllite dissolution was investigated at 25. °C in batch reactors over the pH range of 1-13.5, in inorganic buffered solutions. Dissolution rates were obtained based on the release of Si and Mg. Results obtained in this study show different behaviors for both minerals. For tremolite, dissolution rates show a noticeable dependence on pH between 1 and 8, decreasing as pH increases and reaching a minimum around neutral conditions. At basic pH this dependence becomes even stronger, but dissolution takes place together with collateral effects of saturation and carbonation. A preferential release of Ca and Mg is observed in acid media, lowering the Mg/Si ratio to the extent that Mg solubility decreases with pH. For anthophyllite, dissolution rates also show a strong dependence on pH, between 1 and 9.5. At the same pH, anthophyllite dissolves up to 8 times faster than tremolite. For pH > 9.5 this dependence is smooth, and it is probably associated with effects of saturation and carbonation. Dissolution is also non-stoichiometric with a faster release of Mg with respect to Si in acid media. SEM observations show differences in the breakage mechanism of the fibers. The anthophyllite particle breakage during dissolution consists of the splitting of bundle fibers parallel to the fiber longitudinal direction. However, for tremolite, other than fiber splitting, particles shorten induced by coalescence of etch pits developed perpendicular to c axe. (literal)

Editore