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Journal Articles

A New approach to extracting biofilm from environmental plastics using ultrasound-assisted syringe treatment for isotopic analyses

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

Science of the Total Environment, 849, p.157758_1 - 157758_11, 2022/11

https://doi.org/10.1016/j.scitotenv.2022.157758
 Times Cited Count：4 Percentile：37.30(Environmental Sciences)

Characterizing plastic-associated biofilms is key to the better understanding of organic material and mineral cycling in the "Plastisphere"-the thin layer of microbial life on plastics. In this study, we propose a new method to extract biofilms from environmental plastics, in order to evaluate the properties of biofilm-derived organic matter through stable carbon ($$delta$$$$^{13}$$C) and nitrogen ($$delta$$$$^{15}$$N) isotope signatures and their interactions with radionuclides especially radiocesium ($$^{137}$$Cs). After ultrasound-assisted separation from the plastics, biofilm samples were successfully collected via a sequence of syringe treatments. Biofilm-derived organic matter samples (14.5-65.4 mg) from four river mouths in Japan showed $$^{137}$$Cs activity concentrations of $$<$$75 to 820 Bq kg$$^{-1}$$ biofilm (dw), providing evidence that environmental plastics, mediated by developed biofilms, serve as a carrier for $$^{137}$$Cs in the coastal environment. Significant differences in the ($$delta$$$$^{13}$$C and $$delta$$$$^{15}$$N signatures were also obtained for the biofilms, indicating the different sources, pathways, and development processes of biofilms on plastics.

Journal Articles

Variation of $$^{14}$$C, $$^{137}$$Cs and stable carbon composition in forest soil and its implications

Guo, J.; Atarashi-Andoh, Mariko; Amano, Hikaru

Journal of Radioanalytical and Nuclear Chemistry, 255(1), p.223 - 229, 2003/01

https://doi.org/10.1023/A:1022281226010
 Times Cited Count：7 Percentile：45.43(Chemistry, Analytical)

Soil organic matter content, $$delta$$$$^{13}$$C, $$^{14}$$C and $$^{137}$$Cs radioactivity were determined in 3 undisturbed forest soil profiles in Ibaraki prefecture, Japan to estimate $$^{14}$$C migration in surface environment. The $$^{137}$$Cs data illustrate that no disturbance has occurred during past years in 3 soil profiles. The peak values are observed in the top 10 cm of the soil profiles. $$^{14}$$C activities were determined with fast bomb combustion-liquid scintillation counting method. $$^{14}$$C determination shows that $$^{14}$$C also has peak values in the top 10 cm of the soil profiles ascribed to the highest bomb $$^{14}$$C level in 1960's.$$delta$$$$^{13}$$C values continuously decreased with increasing soil depth. Enrichment of deeper soils in isotope ratio probably results from discrimination against $$^{13}$$C during mineralization and loss of isotopically lighter carbon from soils due to root uptake, leaching etc.It shows that $$delta$$$$^{13}$$C is an excellent indicator of soil carbon turnover and belowground process.

Journal Articles

Characteristics of humic substances in a saline groundwater in Boso peninsula, Japan

Nagao, Seiya; Nakaguchi, Yuzuru*; Fujitake, Nobuhide*; Ogawa, Hiromichi

Proceedings of 10th International Meeting of the International Humic Substances Society (IHSS10), p.1143 - 1146, 2000/07

no abstracts in English

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