Reevaluation of microplastics identification based on Neuston net survey data

Haruka Nakano, Keiichi Uchida, Tetsutaro Aikawa, Toshifumi Hayashi, Hisayuki Arakawa

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


To verify data accuracy regarding microplastics (MPs), the effects of chemical preprocessing and optical identification with Fourier transform infrared spectroscopy (FTIR) were examined using survey data. We aimed to clarify the cause of overestimation of the number concentration of MPs without FTIR by focusing on shape types. The proportion of fragments (foam) decreased (increased) after FTIR analysis. Although significant difference was found in terms of the size distribution of fragments (after FTIR > before FTIR), no such difference was found with regard to foam. These findings indicate that impurities categorized as fragments via visual confirmation, especially those measuring <1000 μm, were removed using the FTIR technique. Although previous studies recommended the use of data on MPs measuring >1000 μm, this threshold should be applied only to fragments and not to foam.

Original languageEnglish
Article number112799
JournalMarine Pollution Bulletin
Publication statusPublished - Oct 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Aquatic Science
  • Pollution


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