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Enhanced Accumulation of Arsenate in Carp in the Presence of Titanium Dioxide Nanoparticles

Authors

Abstract

In this study adsorption of arsenic (As) onto TiO 2 nanoparticles and the facilitated transport of As into carp ( Cyprinus carpio ) by TiO 2 nanoparticles was examined. Adsorption kinetics and adsorption isotherm were conducted by adding As(V) to TiO 2 suspensions. Facilitated transport of As by TiO 2 nanoparticles was assessed by accumulation tests exposing carp to As(V) contaminated water in the presence of TiO 2 nanoparticles. The results showed that TiO 2 nanoparticles had a significant adsorption capacity for As(V). Equilibrium was established within 30 min and the isotherm data was described by Freundlich isotherm. The K F and 1/ n were 20.71 mg/g and 0.58, respectively. When exposed to As(V)-contaminated water in the presence of TiO 2 nanoparticles, carp accumulated considerably more As, and As concentration in carp increased by 132% after 25 days exposure. Considerable As and TiO 2 accumulated in intestine, stomach and gills of the fish, and the lowest level of accumulation was found in muscle. Accumulation of As and TiO 2 in stomach, intestine and gills are significant. Arsenic accumulation in these tissues was enhanced by the presence of TiO 2 nanoparticles. TiO 2 nanoparticles that have accumulated in intestine and gills may release adsorbed As and As bound on TiO 2 nanoparticles which cannot be released maybe transported by TiO 2 nanoparticles as they transferred in the body. In this work, an enhancement of 80% and 126% As concentration in liver and muscle after 20 days of exposure was found.

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Journal

Water, Air, Soil PollutionSpringer Journals

Published: Jan 1, 2007

DOI: 10.1007/s11270-006-9194-y

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