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Nano-sized polystyrene plastics toxicity to microalgae Chlorella vulgaris: Toxicity mitigation using humic acid by Parichehr Hanachi; Mehdi Khoshnamvand; Tony R. Walker; Amir Hossein Hamidian is a Environmental Science article available to read on EtoBox.

What is Nano-sized polystyrene plastics toxicity to microalgae Chlorella vulgaris: Toxicity mitigation using humic acid about?

Polystyrene nanoplastics (PS-NPs) can cause toxicity in aquatic organisms, but presence of natural organic matter (NOM) may alter toxicity of PS-NPs. To better understand effects of NOM on acute toxicity of PS-NPs, humic acid (HA) as a model of NOM was added to green microalga Chlorella vulgaris medium in the presence of aminofunctionalized polystyrene nanoplastics (PS-NH 2 ). Acute toxicity tests of PS-NH 2 to C. vulgaris biomass and chlorophyll a content showed statistical differences between media treated with different concentrations of PS-NH 2 and control groups (p<0.05). HA significantly mitigated PS-NH 2 toxicity to C. vulgaris biomass and chlorophyll a end-points (p<0.05). Additionally, high HA concentration was more effective than low concentration (10 vs 5 mg/L), showing a greater ameliorative effect on PS-NH 2 acute toxicity (p<0.05). Algae exposed to higher PS-NH 2 concentrations showed greater morphological changes (i.e., diminution of photosynthetic pigments, reduction of algal size and formation of more cellular aggregates). Formation of high amounts of algal aggregates under influence of PS-NH 2 was presumably related to the high electrostatic tendency of these part

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Author

Parichehr Hanachi; Mehdi Khoshnamvand; Tony R. Walker; Amir Hossein Hamidian

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Environmental Science (Physical Sciences)