Biofilm-enhanced adsorption of strong and weak cations onto different microplastic sample types: Use of spectroscopy, microscopy and radiotracer methods

被引:113
作者
Johansen, Mathew P. [1 ]
Cresswell, Tom [1 ]
Davis, Joel [1 ]
Howard, Daryl L. [2 ]
Howell, Nicholas R. [1 ]
Prentice, Emily [1 ,3 ]
机构
[1] ANSTO, Locked Bag 2001, Kirrawee Dc, NSW 2232, Australia
[2] Australian Synchrotron, 800 Blackburn Rd, Clayton, Vic 3168, Australia
[3] Univ Technol Sydney, 15 Broadway, Ultimo, NSW 2007, Australia
关键词
Microplastic; Biofilm; Adsorption; K-d; Radionuclides; Microscopy; HYDROPHOBIC ORGANIC-CHEMICALS; PLASTIC PRODUCTION PELLETS; MARINE-ENVIRONMENT; TRACE-METALS; FUKUSHIMA; ACCUMULATION; OCEAN; CONTAMINATION; COMMUNITIES; ACCIDENT;
D O I
10.1016/j.watres.2019.04.029
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The adsorption of metals and other elements onto environmental plastics has been previously quantified and is known to be enhanced by surface-weathering and development of biofilms. However, further biofilm-adsorption characterisation is needed with respect to the fate of radionuclides. This study uses spectroscopy, microscopy and radiotracer methods to investigate the adsorption capacity of relatively strong and weak cations onto different microplastic sample types that were conditioned in freshwater, estuarine and marine conditions although marine data were limited. Fourier-transform infrared spectroscopy confirmed that surface oxidation chemistry changes induced by gamma irradiation were similar to those resulting from environmental exposures. Microscopy elemental mapping revealed patchy biofilm development, which contained Si, Al, and O, consistent with microbial-facilitated capture of clays. The plastics+biofilm of all sample types had measurable adsorption for Cs and Sr radiotracers, suggesting environmental plastics act broadly as a sink for the key pervasive environmental radionuclides of Cs-137 and Sr-90 associated with releases from nuclear activities. Adsorption onto high-density polyethylene plastic types was greater than that on polypropylene. However, in most cases, the adsorption rates of all types of plastic+biofilm were much lower than those of reference sediments and roughly consistent with their relative exchangeable surface areas. Crown Copyright (C) 2019 Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:392 / 400
页数:9
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