SEOUL, February 24 (AJP) - A research team led by Professor Kim Hyung-min at Kookmin University has developed an innovative technology capable of capturing and analyzing micro- and nano-sized plastics in water in real time. The breakthrough addresses a major technical challenge in environmental science by allowing for the continuous monitoring of tiny plastic particles that are otherwise difficult to isolate from their surroundings.
Microplastics, defined as particles smaller than 5 millimeters, originate from industrial processes and daily consumer activities. These particles eventually accumulate in marine ecosystems, where they pose significant risks to both the environment and human health. Despite these dangers, accurately mapping the distribution and weathering process of these particles in vast water bodies has remained difficult for the scientific community.
To overcome these limitations, the researchers created a specialized inspection device that combines optical line tweezer technology with hyperspectral Raman spectroscopy. The system uses a laser to trap flowing microplastic particles along a linear path. By doing so, the device can effectively filter out interference signals from the surrounding water to precisely identify the size, shape, and specific type of each plastic particle.
The equipment is sensitive enough to measure ultrafast, nano-sized particles continuously. This capability significantly improves the accuracy of underwater plastic analysis compared to existing methods, which often struggle to distinguish between organic matter and synthetic pollutants in moving water.
Professor Kim Hyung-min stated that the significance of this technology lies in providing a foundation for the full-scale analysis and real-time monitoring of various chemical and biological substances beyond just aquatic microplastics.
The study was conducted as a joint project with a research team led by Dr. Kim Jae-hun from the Nanophotonics Research Center at the Korea Institute of Science and Technology (KIST). The project received support from the National Research Foundation of Korea through its Nano and Materials Technology Development Program and Mid-career Researcher Support Program.
The findings were published as a cover article in ACS Sensors, a leading journal in the field of analytical science, which ranks in the top 3.6 percent of the Journal Citation Reports (JCR). Lee Ji-yeon, currently a researcher at Dongwoo Fine-Chem, and Dr. Park Su-bin, a postdoctoral researcher at KIST, served as the lead authors.
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