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Background
and Objectives: Nanotechnology defined as understanding
and controlling of materials at dimension between 1-100 nm, which show unusual
physical and chemical properties. With Increasing development of
nanotechnology, concerns associated with release of materials containing
nanoparticles into the environment is rising. The purpose of this study is
investigation of salinity effect on the acute toxicity of silver nanoparticles
in rainbow trout fry (Oncorhynchusmykiss).
Materials
and Methods: In order to conduct the toxicity tests,
the Caspian Seawater(12±0.2 ppt) and (0.4 ppt) as sources of brackish water and
freshwater were used, respectively. Toxicity of silvernano particles were
evaluated in brackish water and freshwater at concentrations of1, 2, 4, 8, 16,
32and64ppm and 0.12, 0.25, 0.5, 1, 2, 4
and8 ppm, respectively. In addition, in order to investigate the quality of the
used silver nanoparticles the Zetasizer, ICP, and TEM method were applied.
Results: Results of 96-hour median lethal concentration(LC50 96h), showed that toxicity
of silver nanoparticles for rain bow trout fry in brackish water is 12 times
less than its toxicity in freshwater.
Conclusion: According to the toxicity categories, analysis of the results showed that, for
rainbow trout fry (1g), silver nanoparticles are classified as highly toxic
agent substances in fresh water, and little toxic in brackish water,
respectively.
