Characterizing the plastic-associated biofilms by a multi-isotope approach; Insight from visible plastics in two contrasting coastal areas of Japan

Battulga, B. ; Nakanishi, Takahiro   ; Atarashi-Andoh, Mariko  ; Koarashi, Jun   

Plastic debris in the aquatic environment receives special attention from scientific communities, whereas the radioactivity of environmental plastic and the dynamics of plastic-associated biofilm remain largely unknown. In this study, we addressed plastic-associated biofilms and bottom sediments from two contrasting coastal areas of Japan to elucidate their characteristics and interaction with radionuclides especially radiocesium (Cs) in the environment. We also explored stable isotope (C and N) signatures of the biofilm and sediment samples based on seasonal variations. Trace of Cs was observed in biofilm with an activity concentration of 29219.4 Bq kg biofilm (dw) which correspond to 1.150.08 Bq kg plastic (dw).