Influence of NOM on the Stability of Zinc Oxide Nanoparticles in Ecotoxicity Tests
Source abstract
Abstract
Nanomaterials are known to aggregate in the presence of ions. Similarly, the aggregation of zinc oxide nanoparticles (ZnO NPs) exposed to various ions such as sodium chloride and calcium chloride in water systems increases with the ionic strength. Therefore, for accurate toxicity studies, it is necessary to conduct a test using natural organic matters (NOMs) as additional dispersants that strengthen stability with increased repulsive forces. The three types of ecotoxicity tests based on the dispersion stability test using NOM showed that the toxicities of the three test samples decreased in the presence of NOM. To determine how NOM improved dispersion and reduced toxicities, we analyzed the ionization degree of ZnO NPs with and without NOM and found that the solubility was below 2 mg/L with a negligible change over time, implying that the ionization effect was low. The absolute value of the surface charge of particles increased in the presence of NOM, resulting in increased repulsive electrostatic forces and steric hindrance, causing less aggregation and more dispersion. Additionally, although the NOM used in the test is considered an effective dispersant that does not have a toxicological effect on aquatic organisms, the presence of NOM resulted in reduced toxicities and should be further investigated to establish it as a standard test method.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Nanoparticles: synthesis and applications · Environmental Toxicology and Ecotoxicology · Toxic Organic Pollutants Impact
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Risk Assessment Division, National Institute of Environmental Research, Incheon 22689, Korea
Department of Mineral Resources and Energy Engineering, Jeonbuk National University, Jeonju 54896, Korea
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