Korea University · Environmental Science
Professor Joorim Na's research lab specializes in environmental toxicology and ecotoxicology, focusing on the impacts of emerging contaminants—particularly biodegradable and conventional microplastics, textile dyeing effluents, and Fenton reaction byproducts—on aquatic ecosystems. The lab investigates the acute and sublethal toxicity of these pollutants to model organisms like *Daphnia magna*, with particular attention to oxidative stress, mitochondrial dysfunction, and interactions with natural organic matter. Their work also explores the role of chemical processes, such as Fenton reactions, in amplifying toxicity, especially when low-purity reagents are involved. The lab integrates toxicity identification evaluation (TIE) and environmental simulation techniques to identify and mitigate sources of pollution in aquatic environments.
Figures are computed from collected data and may differ slightly.
Biodegradable plastics (BPs) are widely used as alternatives to non-BPs due to their inherent ability to undergo facile degradation. However, the ecotoxicological impact of biodegradable microplastics (MPs) rarely remains scientific documented especially to aquatic ecosystem and organisms compared to conventional microplastics. Therefore, this study aimed to investigate the ecotoxicity of biodegradable polylactic acid (PLA) MPs to Daphnia magna with that of conventional polyethylene (PE) MPs wit
This study aimed to identify the source of toxicity in textile dyeing effluent collected from February to July 2016, using Daphnia magna as a test organism. Toxicity identification evaluation (TIE) procedures were used to identify the toxicants in textile dyeing effluent, and Jar testing to simulate the Fenton process was conducted to identify the source of toxicants. Textile dyeing effluent was acutely toxic to D. magna [from 1.5 to 9.7 toxic units (TU)] during the study period. TIE results sho
The proliferation of biodegradable plastics like polylactic acid (PLA) necessitates a deeper understanding of their ecotoxicological impacts, particularly their interactions with co-existing pollutants in aquatic ecosystems. This study investigates the combined toxicity of PLA microplastics (MPs), the insecticide diflubenzuron (DFB), and the influence of natural organic matter (NOM) on the freshwater cladoceran Daphnia magna. Acute 48-hour exposures were conducted to assess mortality, while subl
Correction for 'Effect of low-purity Fenton reagents on toxicity of textile dyeing effluent to Daphnia magna' by Joorim Na et al., Environ. Sci.: Processes Impacts, 2017, DOI: 10.1039/c7em00078b.
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