文献类型：期刊文献

英文题名：A straightforward method for measuring the range of apparent density of microplastics

作者：Li, Lingyun[1];Li, Mengmeng[1];Deng, Hua[1];Cai, Li[2];Cai, Huiwen[1];Yan, Beizhan[3];Hu, Jun[4];Shi, Huahong[1]

机构：[1]East China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200062, Peoples R China;[2]Shanghai Sci & Technol Museum, Shanghai Nat Hist Museum, Nat Hist Res Ctr, Shanghai 200127, Peoples R China;[3]Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA;[4]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China

年份：2018

卷号：639

起止页码：367

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20182105222936);WOS:【SCI-EXPANDED(收录号:WOS:000436806200036)】；

基金：This work was supported by the Natural Science Foundation of China (41776123) and grants from the National Key Research and Development Programs (2016YFC1402204).

语种：英文

外文关键词：Microplastics; Apparent density; Density gradient solutions

摘要：Density ofmicroplastics has been regarded as the primary property that affect the distribution and bioavailability of microplastics in the water column. For measuring the density of microplastis, we developed a simple and rapid method based on density gradient solutions. In this study, we tested four solvents to make the density gradient solutions, i.e., ethanol (0.8 g/cm(3)), ultrapure water (1.0 g/cm(3)), saturated NaI (1.8 g/cm(3)) and ZnCl2 (1.8 g/cm(3)). Density of microplastics was measured via observing the float or sink status in the density gradient solutions. We found that density gradient solutions made from ZnCl2 had a larger uncertainty in measuring density than that from NaI, most likely due to a higher surface tension of ZnCl2 solution. Solutions made from ethanol, ultrapure water, and NaI showed consistent density results with listed densities of commercial products, indicating that these density gradient solutions were suitable for measuring microplastics with a density range of 0.8-1.8 g/cm(3). (C) 2018 Elsevier B.V. All rights reserved.