Sorption of fluoride by quartz sand: batch tests

Despite the many efforts of scientists, in particular those from the field of soil science, the fate and distribution of fluorine (F) species in soils and aquifers remain relatively unraveled. As for groundwater systems, such a shortcoming makes difficult the finding and development of safe water su...

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Autores principales: Usunoff, Eduardo, Weinzettel, Pablo, Dietrich, Sebastián
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Química
F' sorption
Isotherms
Batch tests
Adsorción de F'
Isotermas
Ensayos en lote
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/133648
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-133648
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
F' sorption
Isotherms
Batch tests
Adsorción de F'
Isotermas
Ensayos en lote
spellingShingle Química
F' sorption
Isotherms
Batch tests
Adsorción de F'
Isotermas
Ensayos en lote
Usunoff, Eduardo
Weinzettel, Pablo
Dietrich, Sebastián
Sorption of fluoride by quartz sand: batch tests
topic_facet Química
F' sorption
Isotherms
Batch tests
Adsorción de F'
Isotermas
Ensayos en lote
description Despite the many efforts of scientists, in particular those from the field of soil science, the fate and distribution of fluorine (F) species in soils and aquifers remain relatively unraveled. As for groundwater systems, such a shortcoming makes difficult the finding and development of safe water supplies. Likewise, the use of transport models does not render acceptable results because of the many uncertainties related to the behavior of F in aqueous media. This paper presents the results of four batch test in which solutions of different pH and [F ] (concentration of fluoride) were in contact during 48 hours with clean quartz sand grains. The resulting data were fitted by linear versions of the Freundlich, the Langmuir, and the Langmuir-Freundlich models. The [F ] was varied between 0,5 and 10 mg L1, except in one batch where a large initial concentration of F was used (45 mg L1), and the range of pH used was 2,95 to 5,02. From a sieve analysis, the quartz grains had a medium size (d50) of 0,25 mm, and a uniformity coefficient (d40/d90) of 1,65. According to the fits and some dedicated goodness of fit indices, the Langmuir-Freundlich approach gave the best results for the batch test at the lowest pH, whereas the three remaining tests data were fitted by the Freundlich equation. It has to be mentioned that the pH of the equilibrium solutions were higher than the pH of the initial solutions, which was interpreted as an exchange process of OH' by F' on the quartz sand surface. However, such an exchange does not stand out as the exclusive mechanism promoting the F' disappearance from solution. It is deemed that the obtained results can be used as initial estimates of parameters in models used for calibrating the transport of F' in aquifers.
format Articulo
Articulo
author Usunoff, Eduardo
Weinzettel, Pablo
Dietrich, Sebastián
author_facet Usunoff, Eduardo
Weinzettel, Pablo
Dietrich, Sebastián
author_sort Usunoff, Eduardo
title Sorption of fluoride by quartz sand: batch tests
title_short Sorption of fluoride by quartz sand: batch tests
title_full Sorption of fluoride by quartz sand: batch tests
title_fullStr Sorption of fluoride by quartz sand: batch tests
title_full_unstemmed Sorption of fluoride by quartz sand: batch tests
title_sort sorption of fluoride by quartz sand: batch tests
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/133648
work_keys_str_mv AT usunoffeduardo sorptionoffluoridebyquartzsandbatchtests
AT weinzettelpablo sorptionoffluoridebyquartzsandbatchtests
AT dietrichsebastian sorptionoffluoridebyquartzsandbatchtests
bdutipo_str Repositorios
_version_ 1764820455159496705

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