滨海潮滩土壤中微塑料的分离及其表面微观特征
其他题名Separation of microplastics from a coastal soil and their surface microscopic features
周倩; 章海波; 周阳; 李远; 薛勇; 付传城; 涂晨; 骆永明; 章海波,骆永明 E-mail: hbzhang@yic.ac.cn; ymluo@yic.ac.cn
2016-05-20
发表期刊科学通报
ISSN0023-074X
卷号61期号:14页码:1604-1611
产权排序中国科学院海岸带环境过程与生态修复重点实验室烟台海岸带研究所;中国科学院大学资源与环境学院;
摘要微塑料(<5 mm)作为海岸带地区的新型污染物正越来越受到关注. 本研究以我国河北省曹妃甸围填海区潮滩土壤为例, 采用自行改进设计的连续流动-气浮分离一体化装置, 有效分离和提取了潮滩土壤样品中微塑料,并结合扫描电子显微镜-能谱仪(SEM-EDS)对微塑料表面的微观特性进行了表征. 研究结果表明, 供试土壤中微塑料丰度达到317 n/500 g(其中n表示微塑料个数), 平均粒径为1.56±0.63 mm, 其中<1 mm的微塑料占49.8%; 微塑料丰度上整体呈现随粒径变小而增加的趋势. 在土壤中分离到碎片、颗粒、纤维和薄膜四类微塑料, 其中, 黑色碎片类微塑料为首次报道的类型. 颗粒类微塑料丰度最大但平均粒径最小. 土壤中微塑料表面均有不同程度的风化痕迹, 具有不同形态和大小的微孔结构. 在部分微塑料中还发现其表面附着稳定的铁氧化物. 未来需要深入研究了解基于微塑料表面特性的污染物结合机制、生物积累与生态毒性, 尤其更需关注丰度较高、颗粒更细的<1 mm的这部分微塑料(MP1).
其他摘要Microplastics (<5 mm) are emerging pollutants in the coastal zone and are of worldwide concern. Previous studies have shown the importance of surface features of microplastics on the adsorption and transport of chemical pollutants in the ocean and coastal environment. The objective of this study was therefore to characterize the surface properties of the microplastic samples from a reclamation area polluted by plastic debris in Chaofeidian, Hebei Province. A surface (0–2 cm) soil composite sample was collected from several square plots each with an area of 1 m×1 m. The microplastics were separated in two steps. Firstly, 500 g (dry weight) soil sample was reduced to <100 g soil which contained most of the microplastics using continuous air-flow flotation separation apparatus designed by our own group. Secondly, the microplastics were separated from the soil by density separation using NaI solution (1.8 g cm3 ) followed by visual selection. All the microplastics were photographed and image analysis was performed using the program Nano Measurer 1.2 for counting and size measurement. The microscopic features of the microplastic surfaces were characterized using a scanning electron microscope equipped with an energy dispersive spectrometer (SEM-EDS). Four types of microplastics, namely fragments, granules, fibers and films, were separated from the test soil and black film is a new type of microplastic reported here for the first time. The abundance of all the microplastics was 317 n (500 g)1 (dry weight) at this site with granulate microplastics accounting for 75% of the total abundance followed by fragments accounting for 20%. The size of the microplastics was 1.56±0.63 mm on average and the <1 mm size fraction accounted for 49.8% of the material. The abundance of the different size fractions of the microplastics was negatively correlated with their size in general. Granules were the most abundant type with the smallest average size on the whole. The abundance and size of the microplasitcs found at this site were comparable to those in other study areas such as a coastal sand beach in Belgium and mangrove sediment in Singapore. The SEM results show weathering features on the microplastic surfaces which were characterized by various porous morphologies and structures. The surface of microplastic samples from the soil was rough with pronounced cavities and similar to previous results observed in coastal environments. However, the surface morphology was distinctly different from that of the virgin plastics. The uneven surface of the microplastics might increase fouling due to changes in surface area and other properties as reported in other studies. We used two solutions (H2O and 2 mol L1 HCl) to distinguish the foulants between stable and loose combinations. The adhering soil particles were easily removed by washing with water and HCl. However, iron oxides were observed adhering tightly to the surfaces of some of the microplastics and could not be removed by washing with 2 mol L1 HCl. Since there are several types of iron oxides with different surface properties, their stable combination with the mciroplastics might have a pronounced impact on the surface alteration of the microplastics. Moreover, the complicated surfaces of the weathered microplastics likely have very different adsorption characteristics for chemical pollutants compared with the unaltered virgin plastic surfaces. More surface properties of weathered mciroplastics (including pore volume, crystalline structure, and functional groups) must therefore be identified. Moreover, further studies are required to explore the binding mechanisms of chemical pollutants on the microplastic surfaces and the bioaccumulation and ecological toxicity of these combined pollutants with respect to the different surface morphologies and other characteristics of the microplastics with special concern regarding microplastics that are dominated by the <1 mm fraction (MP1).
关键词微塑料污染 表面微形貌 丰度 连续流动-气浮分离 海岸带土壤
作者部门中科院海岸带环境过程与生态修复重点实验室
DOI10.1360/N972015-01098
项目资助者中国科学院重点部署项目(KZZD-EW-14),中国科学院战略先导专项(XDA11020402)资助
收录类别CSCD
文章类型期刊论文
语种中文
CSCD记录号CSCD:5715301
引用统计
被引频次:8[CSCD]   [CSCD记录]
文献类型期刊论文
条目标识符http://ir.yic.ac.cn/handle/133337/17403
专题中科院海岸带环境过程与生态修复重点实验室
通讯作者章海波,骆永明 E-mail: hbzhang@yic.ac.cn; ymluo@yic.ac.cn
作者单位1.中国科学院海岸带环境过程与生态修复重点实验室烟台海岸带研究所
2.中国科学院大学资源与环境学院
推荐引用方式
GB/T 7714
周倩,章海波,周阳,等. 滨海潮滩土壤中微塑料的分离及其表面微观特征[J]. 科学通报,2016,61(14):1604-1611.
APA 周倩.,章海波.,周阳.,李远.,薛勇.,...&ymluo@yic.ac.cn.(2016).滨海潮滩土壤中微塑料的分离及其表面微观特征.科学通报,61(14),1604-1611.
MLA 周倩,et al."滨海潮滩土壤中微塑料的分离及其表面微观特征".科学通报 61.14(2016):1604-1611.
条目包含的文件 下载所有文件
文件名称/大小 文献类型 版本类型 开放类型 使用许可
滨海潮滩土壤中微塑料的分离及其表面微观特(1985KB)期刊论文作者接受稿开放获取CC BY-NC-SA浏览 下载
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[周倩]的文章
[章海波]的文章
[周阳]的文章
百度学术
百度学术中相似的文章
[周倩]的文章
[章海波]的文章
[周阳]的文章
必应学术
必应学术中相似的文章
[周倩]的文章
[章海波]的文章
[周阳]的文章
相关权益政策
暂无数据
收藏/分享
文件名: 滨海潮滩土壤中微塑料的分离及其表面微观特征.pdf
格式: Adobe PDF
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。