Publication Date:
2021-07-24
Description:
In this study, toxicity and probable effects of nanomaterial’s including titanium dioxide, copper oxide and zinc oxide in acute and chronic toxicity tests, separately and together has been studied on indicator species of water resources, including Daphnia magna, Amphibalanus amphitrit, Artemia fransiscan .Acute toxicity effects has been studid During the 96-hour and chronic toxicity test done in 14-day period (Artemia franciscana and Amphibalanus amphitrite) and 21 days (Daphnia magna), in exposure to Nano-materials separately, and the percentage of two nanomaterial’s and all three Nano-materials to study synergistic effects. Water quality parameters including DO, pH, EC, temperature, water hardness, SS and TDS in all treatments were measured, daily. The number and percentage of daily mortality recorded and by using Probite software LC50, LC10, LC90 were calculated. In chronic toxicity tests other parameters including larval development success, fertility, the percentage of adhesion to surfaces (barnacles) were recorded. Daphnia magna acute lethal toxicity LC50 96h for exposure to titanium dioxide, zinc oxide and copper oxide nanoparticles, were 123.796, 0.648 and 2.991 mg/ l respectively, and for barnacle were 25.434, 143.776 and 2.501 ml/l respectively, and for Artemia were 30.548, 173.209 and 4.328 mg/l, respectively. Statistical analysis and correlation coefficients in acute toxicity test showed a significant correlation between mortality and time. In Acute toxicity tests on Daphnia magna was found that titanium oxide and zinc oxide enhances the effects of mortality caused by copper. However, titanium dioxide and zinc has no effect on these at the same time not increasing. In the case of titanium dioxide and zinc oxide showed the synergistic effect on the toxicity of copper oxide, and copper oxide, titanium dioxide has a synergistic effect in toxicity. In Artemia titanium dioxide and zinc oxide, has the synergistic effect of copper oxide and copper oxide have the synergistic effect of titanium dioxide. In chronic toxicity studies in addition to mortality, the percentage of adhesion (Barnacles), success in the development of the larval stages, reproductive success, respond to light, were analyzed. These nanomaterials have an adverse effect on fertile time, delay and time spent in the larval stages of species, light respond and swimming in this species.
Description:
PhD
Description:
Advisor:
Neamat allah Jaafarzadeh Haghighi fard; Shahla Jamili
Consulting Advisors: Parvin Farshchi; Lobat Taghavi
Keywords:
Environment
;
Pollution
;
Daphnia magna
;
Amphibalanus amphitrit
;
Artemia fransiscan
;
Nanomaterials
;
Acute toxicity
;
Chronic toxicity
;
Synergistic effect
Repository Name:
AquaDocs
Type:
thesis
Format:
application/pdf
Format:
application/pdf
Format:
281
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