NDLI: Experimental investigation of cephapirin adsorption to quartz filter sands and dune sands

Content Provider	Springer Nature Link
Author	Peterson, Jonathan W. O’Meara, Theresa A. Seymour, Michael D.
Copyright Year	2008
Abstract	Batch experiments were performed to investigate cephapirin (a widely used veterinary antibiotic) adsorption on various size sands of low total organic carbon content (0.08–0.36 wt%). In the aqueous concentration range investigated (11–112 μmol/L cephapirin), adsorption to nearly pure quartz filter sands (0.50–3.35 mm diameter) is low. Isotherms are S-shaped and most display a region of minimum adsorption, where decreased adsorption occurs with increasing solution concentration, followed by increased adsorption at higher concentrations. Cephapirin adsorption to quartz-rich, feldspar-bearing dune sands (0.06–0.35 mm diameter), and the smallest quartz filter sand investigated (0.43–0.50 mm), can be described by linear sorption isotherms over the range of concentrations investigated. Distribution coefficients (K $_{d}$) range from 0.94 to 3.45 L/kg. No systematic relationship exists between grain size and amount of adsorption for any of the sands investigated. Cephapirin adsorption is positively correlated to the feldspar ratio (K-feldspar/(albite + Ca-plagioclase). Feldspar-ratio normalization of distribution coefficients was more effective than organic carbon normalization at reducing variability of K $_{d}$ values in the dune sands investigated.Des expériences par lots ont été réalisées pour étudier l’adsorption de la céfapirine (un antibiotique très utilisé en vétérinaire) sur différentes tailles de sables à faible teneur en carbone organique (0.08–0.36% du poids total). Dans les concentrations aqueuses investies (11 à 112 μmol/L de céfapirine), l’adsorption sur des sables de quartz pratiquement purs (diamètre de 0.50–3.35 mm) est faible. Les isothermes ont une forme en S et représentent surtout une région d’adsorption minimum, où la décroissance de l’adsorption apparaît avec une augmentation de la concentration de la solution, suivie par une augmentation de l’adsorption à des concentrations plus importantes. L’adsorption de la céfapirine sur du sable (0.06–0.35 mm) de dune riche en quartz et contenant du feldspath et un filtre à sable quartzeux plus petit (0.43–0.50 mm), peut être décrit par des isothermes de sorption linéaires sur l’échelle de concentrations étudiées. Les coefficients de distribution (K $_{d}$) se situent entre 0.94 et 3.45 L/kg. Pour tous les sables étudiés aucune relation systématique n’existe entre la taille des grains et l’importance de l’adsorption. L’adsorption de la céfapirine est corrélée positivement avec le rapport de feldspath (K-feldspath/(albite + Ca-plagioclase). La normalisation des coefficients de distribution par rapport au rapport de Feldspath est plus efficace que la normalisation par rapport au carbone organique à des variabilités de K $_{d}$ réduites dans les sables de dune étudiés.Experimentos en batch fueron realizados para investigar la adsorpción de cefapirina (un antibiotico veterinario usado ampliamente) en arenas de varios tamaños con bajo contenido de carbón orgánico total (0.08–0.36%pt.). En el rango de concentración acuosa investigado (11 to 112 μmol/L, de cefapirina), la adsorpción es baja en filtros de arenas con cuarzo casi puro (0.50–3.35 mm-diámetro). Las isotermas tienen forma-S y la mayoría muestran una región de adsorpción mínima, donde ocurre adsorpción decreciente con concentración de solución creciente, seguida por un incremento de adsorpción a concentraciones mayores. La adsorpción de cefapirina en dunas de arenas ricas en cuarzo y conteniendo feldespato (0.06–0.35 mm-diámetro), y en el filtro de arena más pequeño investigado (0.43–0.50 mm), puede ser descrita por isotermas de sorpción lineales en todo el rango de concentraciones investigado. Los coeficientes de distribución (K $_{d}$) van de 0.94 a 3.45 L/kg. No existe relación sistemática entre la granulometría y la cantidad de adsorpción en ninguna de las arenas investigadas. La adsorpción de cefapirina está positivamente correlacionada con la razón de feldespato (K-feldespato/(albita + Ca-plagioclasa). La normalización de coeficientes de distribución de la razón de feldespato fue más efectiva que la normalización de carbón orgánico en la reducción de variabilidad de valores de K $_{d}$ en las dunas de arena investigadas.
Starting Page	879
Ending Page	892
Page Count	14
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	16
Issue Number	5
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-02-05
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Antibiotics Adsorption Hydrochemistry Solute transport Laboratory experiments/measurements Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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