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Study of the effect of silver nanoparticles (AgNPs) and silica nanoparticles (SiO2NPs) on growth indices and photosynthetic pigments of the phytoplankton, Nannochloropsis oculata
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Mohammad javad Jami1   , Ali Johari , Mohamad Behzadi tayemeh , Hesamoddin Abaie |
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Abstract: (605 Views) |
Abstract
To investigate the effect of silver nanoparticles and silica dioxide nanoparticles on Nannochloropsis oculata, this microalgae was exposed for 72 hours to concentrations of 0.005, 0.010, 0.025, 0.050, 0.075, and 0.100 mg/L of silver nanoparticles and 75, 100, 150, and 200 mg/L of silica dioxide nanoparticles according to OECD Test Guideline No. 201, and the growth inhibition percentage, specific growth rate, and photosynthetic pigment concentrations were subsequently examined for each treatment. The values of inhibitory concentrations (ICs), including the IC50, were calculated based on the average growth inhibition percentage using Probit software. According to the results, silver nanoparticles at the lowest concentration examined caused a reduction in growth and a decrease in the amount of photosynthetic pigments in the studied microalgae, and with an increase in their concentration to 0.075 and 0.1 mg per liter, they caused complete growth cessation. Different concentrations of SiO2NPs reduced the growth rate and biomass density of the microalgae but did not completely stop their growth. The toxicity effect of silver nanoparticles and silica dioxide nanoparticles on the photosynthetic pigments in microalgae showed a concentration-and time-dependent manner of the nanoparticles, such that with increasing concentration and duration of exposure, the levels of chlorophyll a, b, total chlorophyll, and carotenoids showed significant reductions. Silver nanoparticles and silica dioxide nanoparticles caused toxicity, increased the percentage of average growth inhibition, and reduced the amount of photosynthetic pigments across all tested concentrations |
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| Keywords: Nanotechnology, Aquatic nanotoxicology, Microalgae, Acute toxicity, Chlorophyll. |
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Full-Text [DOC 3399 kb]
(261 Downloads)
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Type of Study: Research |
Subject:
آلودگي محيطهاي آبي
Received: 2025/01/19 | Accepted: 2025/09/1 | Published: 2025/08/16
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