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61,005 resultsShowing papers similar to Humic acid alleviates the toxicity of polystyrene nanoplastic particles toDaphnia magna
ClearEffect of salinity and humic acid on the aggregation and toxicity of polystyrene nanoplastics with different functional groups and charges
Researchers showed that surface charge governs nanoplastic behavior in water — higher salinity caused negatively charged nanoplastics to aggregate while positively charged particles remained stable — and that humic acid (dissolved organic matter) alleviated toxicity to Daphnia, increasing survival from 15% to nearly 100% in some cases.
Organic matter reduces acute toxicity for Daphnia magna exposed to polystyrene nanoparticles
This study found that dissolved organic matter in water significantly reduced the acute toxicity of polystyrene nanoplastics to Daphnia magna water fleas. The research suggests that the real-world toxicity of nanoplastics in natural waters, where organic matter is abundant, may be lower than what controlled laboratory studies alone would predict.
Joint effect of nanoplastics and humic acid on the uptake of PAHs for Daphnia magna: A model study
This study examined how humic acid (a form of dissolved organic matter) modifies the bioaccumulation of polycyclic aromatic hydrocarbons in aquatic organisms exposed to nanoplastics, finding that humic acid significantly altered the joint effects of the two complex matrices. The results indicate that natural organic matter plays an important role in regulating nanoplastic-associated chemical uptake.
Humic acid alleviates the toxicity of polystyrene nanoplastics in combination with their copper nanoparticle co-pollutants in Artemia salina
Researchers examined how humic acid, a natural organic substance found in soil and water, affects the toxicity of polystyrene nanoplastics combined with copper nanoparticles in brine shrimp. They found that humic acid reduced the harmful effects of these co-pollutants, likely by coating the particles and limiting their biological interactions. The study suggests that natural organic matter in the environment may help buffer some of the toxic effects of nanoplastic pollution.
Controlled protein mediated aggregation of polystyrene nanoplastics does not reduce toxicity towards Daphnia magna
Researchers found that protein-mediated aggregation of polystyrene nanoplastics into larger clusters did not reduce their toxicity to Daphnia magna, whereas solid particles of equivalent aggregate size were non-toxic, suggesting aggregation state alone does not determine nanoplastic hazard.
Humic acid can mitigate or magnify nanoplastic toxicity to freshwater microalgae: what are the factors driving these contrasting effects?
Researchers explored how humic acid, a natural organic substance found in water, interacts with nanoplastics to either reduce or amplify their toxicity to freshwater microalgae. The study found that humic acid can mitigate nanoplastic toxicity by reducing surface hydrophobicity and improving particle dispersion, but this protective effect diminishes at low humic acid concentrations.
Stabilization of Fragmental Polystyrene Nanoplastic by Natural Organic Matter: Insight into Mechanisms
This study investigated how natural organic matter stabilizes fragmental polystyrene nanoplastics in aqueous environments, finding that humic and fulvic acid coatings reduce aggregation and enhance colloidal stability, affecting nanoplastic transport and bioavailability.
Eco-Corona vs Protein Corona: Effects of Humic Substances on Corona Formation and Nanoplastic Particle Toxicity in Daphnia magna
Researchers studied how humic substances, common natural organic matter in aquatic environments, affect the toxicity and corona formation of nanoplastic particles in Daphnia magna. The study found that humic substances reduced acute nanoplastic toxicity at environmentally relevant concentrations by forming eco-coronas on particle surfaces, though gene expression changes related to detoxification and stress responses were still observed.
Aquatic behavior and toxicity of polystyrene nanoplastic particles with different functional groups: Complex roles of pH, dissolved organic carbon and divalent cations
Researchers systematically examined how water chemistry — pH, dissolved organic carbon, and divalent calcium and magnesium ions — affects the stability, aggregation, and toxicity of polystyrene nanoplastics with different surface functional groups, finding that complex solution conditions enhanced aggregation through cation bridging and increased oxidative gut damage in Daphnia magna.
Alleviating binary toxicity of polystyrene nanoplastics and atrazine to Chlorella vulgaris through humic acid interaction: Long-term toxicity using environmentally relevant concentrations
Researchers found that when nanoplastics and the herbicide atrazine were combined in water, they had a synergistic toxic effect on algae that was worse than either pollutant alone. However, adding humic acid, a natural substance found in soil and water, significantly reduced this combined toxicity by coating the nanoplastics and changing their surface properties. This suggests that natural organic matter in the environment may offer some protection against the harmful effects of nanoplastic-chemical mixtures.
Polystyrene Nanoplastic Behavior and Toxicity on Crustacean Daphnia magna: Media Composition, Size, and Surface Charge Effects
Researchers examined how size and surface charge of polystyrene nanoplastics (20-100 nm) affected their behavior and toxicity to Daphnia magna in different water media, finding that smaller particles and certain media compositions significantly increased toxicity and aggregation patterns.
Nano-sized polystyrene plastics toxicity to microalgae Chlorella vulgaris: Toxicity mitigation using humic acid
Researchers exposed the green microalga Chlorella vulgaris to amino-functionalized polystyrene nanoplastics and found significant toxicity to biomass and chlorophyll, but adding humic acid — a natural organic matter component — substantially reduced toxicity by coating the nanoplastics' positively charged surfaces and preventing their electrostatic attraction to algal cell walls.
Presence of humic acid in the environment holds promise as a potential mitigating factor for the joint toxicity of polystyrene nanoplastics and herbicide atrazine to Chlorella vulgaris: 96-H acute toxicity
Researchers studied how nanoplastics and the herbicide atrazine together affect freshwater algae, and whether humic acid, a natural organic substance found in water, could reduce their combined harm. They found that both the nanoplastics alone and in combination with atrazine damaged algal growth, photosynthesis, and antioxidant defenses. The presence of humic acid significantly reduced these toxic effects, suggesting it may act as a natural buffer against nanoplastic and pesticide pollution in aquatic environments.
Influences of molecular weight fractionated humic acids on polyamide 66 microplastic stability and toxicity in red tilapia (Oreochromis niloticus)
Researchers found that humic acids of different molecular weights enhanced the stability and aquatic persistence of polyamide 66 microplastics, leading to greater accumulation in red tilapia gut tissues and increased oxidative stress, suggesting that dissolved organic matter worsens microplastic toxicity in real-world water environments.
The regulation of the environmental behavior of NPs by humic acid: A review
This review examines how humic acid, a naturally occurring substance in soil and water, interacts with nanoplastics in the environment. Researchers found that humic acid significantly influences how nanoplastics behave, move, and exert toxic effects, suggesting that traditional toxicity assessments based on pure nanoplastics alone may not reflect real-world exposure conditions.
Further research on the impacts of humic acid in the aggregation of nanoplastics: The roles of molecular weight and surface functionalization
Researchers studied how humic acid — a natural compound found in soil and water — coats nanoplastic particles and changes how they clump together, finding that larger humic acid molecules create thicker coatings that keep nanoplastics suspended and dispersed rather than settling. This matters because dispersed nanoplastics travel farther through water systems and are more likely to be ingested by organisms.
Microplastic Impacts on Microalgae Growth: Effects of Size and Humic Acid
Researchers investigated how different sizes of polystyrene microplastics affect the growth of freshwater microalgae, both with and without naturally occurring humic acid. They found that larger particles blocked light and disrupted photosynthesis, while smaller ones damaged cell walls by adhering to the algae surface. Adding humic acid significantly reduced the toxicity of smaller microplastics by forming a protective coating around the particles.
Quantification of the combined toxic effect of polychlorinated biphenyls and nano-sized polystyrene on Daphnia magna
Researchers investigated how nano-sized polystyrene particles modify the acute toxicity of polychlorinated biphenyls (PCBs) to Daphnia magna, finding that low concentrations of nanoplastics reduced PCB toxicity by binding and sequestering the chemicals, while high nanoplastic concentrations became directly lethal, reversing the protective effect.
Influence of environmental and biological macromolecules on aggregation kinetics of nanoplastics in aquatic systems
Researchers studied how natural macromolecules like humic acid, alginate, and proteins influence the clumping behavior of polystyrene nanoplastics in water. They found that these macromolecules generally stabilized nanoplastics in sodium chloride solutions but caused them to aggregate in calcium chloride solutions, with effects varying by pH. The findings suggest that the environmental fate and transport of nanoplastics in natural waters depends heavily on the surrounding organic molecules and water chemistry.
Combined effects of photoaging and natural organic matter on the colloidal stability of nanoplastics in aquatic environments
Researchers found that photoaging of polystyrene nanoplastics alters how natural organic matter interacts with their surfaces — reducing humic acid adsorption while increasing protein adsorption — with downstream effects on the nanoplastics' stability and transport in aquatic environments.
Effects of dissolved organic matter on the toxicity of micro- and nanoplastic particles to Daphnia - a meta-analysis
This meta-analysis pools data from 13 studies to examine whether dissolved organic matter in water can reduce the harmful effects of micro- and nanoplastics on water fleas. The findings suggest that certain natural substances in water may lessen plastic particle toxicity, offering insight into how environmental conditions influence the real-world risks of microplastic pollution.
Cation-π mechanism promotes the adsorption of humic acid on polystyrene nanoplastics to differently affect their aggregation: Evidence from experimental characterization and DFT calculation
Researchers investigated how humic acid and metal ions in natural lake water affect the clumping behavior of polystyrene nanoplastics, finding that a cation-π bonding mechanism — where metal ions bridge humic acid molecules onto the nanoplastic surface — governs whether particles aggregate or remain dispersed, with major implications for their environmental persistence and toxicity.
Acute toxicity of nanoplastics on Daphnia and Gammarus neonates: Effects of surface charge, heteroaggregation, and water properties
Researchers examined nanoplastic toxicity on crustacean neonates and found that smaller particles (20-40 nm) were more toxic, with surface charge and aggregation behavior being the primary factors influencing toxicity depending on species and water conditions.
Investigating the toxicities of different functionalized polystyrene nanoplastics on Daphnia magna
Researchers compared the toxicity of plain and surface-modified polystyrene nanoplastics on Daphnia water fleas, finding that unmodified particles were most lethal by activating stress kinase pathways, while surface-functionalized particles were less toxic — largely because positively charged particles aggregated rapidly in water and reduced their effective exposure concentration.