JOURNAL OF CHILEAN CHEMICAL SOCIETY

Vol 69 No 1 (2024): JCChemS
Original Research Papers

Evaluation of microwave-assisted acid/oxidant digestion method for the detection of polyethylene microplastics in Merluccius Gayi fish by Nile Red fluorescent staining and image analysis

Published October 6, 2024
Keywords
  • microplastics,
  • fish,
  • image analysis,
  • microwave digestion,
  • fluorescence
How to Cite
FERRADA, C., PEREZ, M., PARRA, S., SALAS, E., SEPULVEDA, F., BRAVO, M. A., & Quiroz, W. (2024). Evaluation of microwave-assisted acid/oxidant digestion method for the detection of polyethylene microplastics in Merluccius Gayi fish by Nile Red fluorescent staining and image analysis. Journal of the Chilean Chemical Society, 69(1), 6082-6085. Retrieved from https://www.jcchems.com/index.php/JCCHEMS/article/view/2686

Abstract

This study proposes a new method for the determination of polyethylene in Merluccius Gayi by microwave digestion, Nile Red fluorescent staining, mobile phone camera and image analysis.

We have demonstrated that lyophilization of the sample is an unnecessary step in the process of determining polyethylene microplastics, obtaining recoveries close to 65% and generating sample losses. Furthermore, a method for matrix reduction is validated using direct raw sample digestion with 9/1 HNO3/H2O2 microwave-assisted digestion achieving recoveries of over 98% for microplastics.

Polyethylene fluorescent color obtained was a bright yellow, which allowed it to be distinguished from micro-particles of polystyrene, polypropylene, polyvinyl chloride, and polyethylene terephthalate easily to the naked eye. Additionally, it was possible to train artificial intelligence to perform this selective identification through image analysis.

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