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Action of Surfactants in Driving Ecotoxicity of Microplastic-Nano Metal Oxides Mixtures: A Case Study on Daphnia magna under Different Nutritional Conditions
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This study tested how surfactants (found in detergents and cleaning products) interact with microplastics and metal oxide nanoparticles to affect the toxicity of these combined pollutants on water fleas (Daphnia magna). Surfactants increased the toxicity of microplastic-nanoparticle mixtures, and the effect varied with the age and nutritional status of the test organisms. This highlights how the complex real-world mixture of pollutants in waterways can be more harmful than any single contaminant alone.
The series of experiments presented in the paper served to clarify the effects of contemporary exposure to surfactant, microplastics (polyethylene and polyvinyl chloride), and nanoparticles (TiO2 and ZnO) on the model organism Daphnia magna. Exposure was evaluated with respect to the age of the organisms (“young”, 24 hours old, and “aged” 10 days old specimens), trophic status (feeding or fasting), and the simultaneous presence of a surfactant. All the above-mentioned substances are present in the wastewater coming from various environmental sources from cosmetic products. The experiments were conducted in compliance with the OECD 202:2004 guideline, which is also a reference for ecotoxicity tests required by REACH. The results showed that surfactants enhance effects of toxicity produced by the exposure to the microplastic + nanoparticle mixtures. The influence due to factors such as nutrition (effect in fasting >> feeding conditions) and the age of individuals (effects in older >> younger animals) is essential. Concerning young individuals, exposure to PE-TiO2 is the most significant in terms of effects produced: it is very significant, especially in the presence of surfactant (both under fasting and feeding conditions). On the contrary, exposure to the PE-Zn mixture shows the minor effects. The comparison with the literature, especially as regards the possibility of interpreting the toxicity trends for the various mixtures with respect to the individual elements that compose them, leads to hypothesize additive effects still to be investigated and confirms the greatest toxicity contribution of TiO2.
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Ecotoxicological Effects of Gold Nanoparticles and Microplastics in Daphnia magna
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This study tested gold nanoparticles and polyethylene microplastics, alone and combined, on water fleas (Daphnia magna) over 21 days. Both substances individually caused death and reduced reproduction, and when combined, their harmful effects on the water fleas were stronger than either alone.
Toxicological interactions induced by chronic exposure to gold nanoparticles and microplastics mixtures in Daphnia magna
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This study examined the combined toxicological effects of gold nanoparticles and microplastics through chronic exposure, finding interactive effects that differed from either contaminant alone, emphasizing the importance of studying multiple stressors together.
Acute toxicity of triclosan, caffeine, nanoplastics, microplastics, and their mixtures on Daphnia magna
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Researchers tested the acute toxicity of triclosan, caffeine, nanoplastics, and microplastics individually and in mixtures on the water flea Daphnia magna. They found that nanoplastics were more toxic than microplastics, and mixtures of these pollutants with triclosan or caffeine produced varying levels of combined toxicity. The study highlights that environmental pollutants rarely occur in isolation, and their mixtures may have unpredictable effects on aquatic organisms.
The synergistic effect of mono and co-exposure of microplastic suspensions on Daphnia magna’s survival, population density, reproduction rate & swimming behavior.
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When water fleas (Daphnia magna) were exposed to mixtures of HDPE, LDPE, and polypropylene microplastics together, the combined toxicity was substantially greater than any single polymer alone, with the mixture LC50 dropping to 77 mg/L compared to 109–123 mg/L for individual plastics. This synergistic effect — reducing survival, reproduction, and normal swimming behavior — is an important finding because organisms in nature encounter mixtures of plastic types, not just one at a time.
Toxicity of mixtures of cyanobacteria and microplastics in aquatic organisms
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Scientists tested how water fleas (Daphnia magna) responded to microplastics, toxin-producing algae extracts, and mixtures of both. Both substances alone caused harmful effects like reduced survival, growth and reproduction, and combining them showed some added interactions between the two contaminants.
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