Fluoride retardation from quartz sand-packed column tests

Inasmuch as both low and high concentrations of F' in groundwater have different detrimental effects on human health (increased dental caries, and mottled enamel or even severe structural bone deformations, respectively), many efforts have focused on the movement of such anion in aqueous system...

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Autores principales: Usunoff, Eduardo, Weinzettel, Pablo, Dietrich, Sebastián
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Química
Column experiments
F’ adsorption/desorption
Retardation
Experimentos de columna
Adsorción/desorción de F
Retardo
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/133652
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-133652
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Column experiments
F’ adsorption/desorption
Retardation
Experimentos de columna
Adsorción/desorción de F
Retardo
spellingShingle Química
Column experiments
F’ adsorption/desorption
Retardation
Experimentos de columna
Adsorción/desorción de F
Retardo
Usunoff, Eduardo
Weinzettel, Pablo
Dietrich, Sebastián
Fluoride retardation from quartz sand-packed column tests
topic_facet Química
Column experiments
F’ adsorption/desorption
Retardation
Experimentos de columna
Adsorción/desorción de F
Retardo
description Inasmuch as both low and high concentrations of F' in groundwater have different detrimental effects on human health (increased dental caries, and mottled enamel or even severe structural bone deformations, respectively), many efforts have focused on the movement of such anion in aqueous systems. It is so because water drinking is the main intake of F' by humans. This paper presents the results of seven dynamic experiments in which solutions of varying [F'J, pH, and flow velocities circulated through columns packed with clean quartz sand. The breakthrough data were analyzed by means of a computer code adapted to the estimation of equilibrium and non-equilibrium solute transport parameters from miscible displacement experiments in a steady-state, uniform flow field using a pulse-type or continuous source. It was found that larger retardation factors (R) are associated with low pH, low [F ] in the feed solutions, and larger flow velocities. Such results appear to be related to the form of the F species, the rather weak bond between the adsorbate and the quartz sand, and stronger anion repulsion at low pore velocities. The estimated values for R vary between 1,22 and 1,50, whereas the distribution coefficients were in the range of 0,1 to 0,05 L kg1. It should be said that the breakthrough curves display hysteresis, leading to a desorption behavior that proceeds faster than the adsorption process.
format Articulo
Articulo
author Usunoff, Eduardo
Weinzettel, Pablo
Dietrich, Sebastián
author_facet Usunoff, Eduardo
Weinzettel, Pablo
Dietrich, Sebastián
author_sort Usunoff, Eduardo
title Fluoride retardation from quartz sand-packed column tests
title_short Fluoride retardation from quartz sand-packed column tests
title_full Fluoride retardation from quartz sand-packed column tests
title_fullStr Fluoride retardation from quartz sand-packed column tests
title_full_unstemmed Fluoride retardation from quartz sand-packed column tests
title_sort fluoride retardation from quartz sand-packed column tests
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/133652
work_keys_str_mv AT usunoffeduardo fluorideretardationfromquartzsandpackedcolumntests
AT weinzettelpablo fluorideretardationfromquartzsandpackedcolumntests
AT dietrichsebastian fluorideretardationfromquartzsandpackedcolumntests
bdutipo_str Repositorios
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