Relationships Between Microplastic and Surrounding Soil in an E-Waste Zone of China

被引：5
|
作者：
Chai B.-W. [1 ]
Yin H. [1 ]
Wei Q. [2 ]
Lu G.-N. [1 ]
Dang Z. [1 ]
机构：
[1] School of Environment and Energy, South China University of Technology, Guangzhou
[2] Medical Devices Research and Testing Center, South China University of Technology, Guangzhou
来源：
Huanjing Kexue/Environmental Science | 2021年 / 42卷 / 03期
关键词：
E-waste; Guiyu; Heavy metal; Microorganism; Microplastic; Soil;
D O I：
10.13227/j.hjkx.202007245
中图分类号：
学科分类号：
摘要：
Microplastic pollution is ubiquitous and has attracted significant public attention. Recent research on microplastic has focused on aquatic environments, but its impacts on soil ecosystems remain poorly understood, especially in e-waste dismantling zones. The objective of this study was to investigate the relationships between microplastic and surrounding soil in abandoned e-waste disassembling plots with different dismantling methods focusing on ecotoxicology and microbiology in Guiyu, Shantou District, Guangdong Province. The surface morphology of collected microplastics showed signs of aging and degradation, possibly due to their long-term exposure in the soil and the original disassembling methods. In addition, there were diverse metal elements at different surface positions of the same microplastic sample based on SEM-EDS analyses, indicating that some metal elements carried by microplastics are derived from the surrounding soil rather than being inherent to the microplastic. Moreover, seven heavy metals (Pb, Cd, Cr, As, Ba, Co, and Ni) inherent in microplastic were identified using ICP-OES, revealing that the concentrations varied in different sampling plots were typically higher than in the surrounding soil. In particular, the concentration of Ba in microplastic was 103 orders of magnitude higher than in soil. Indeed, Ba in the form of BaSO4 is widely used as a filler in numerous plastics. Furthermore, microplastic-associated microorganisms were examined using 16S rRNA sequencing, and the relationships between the top 50 genera of microplastic-bound bacteria and soil environmental factors were analyzed using the Spearman's rank correlation coefficient. Microorganisms primarily originated from the surroundings of microplastics; therefore, environmental factors could directly affect the microbial communities associated with this type of pollutant. Importantly, different dismantling methods were associated with distinct soil environmental factors, and their correlations with microplastic-associated microorganisms also varied. © 2021, Science Press. All right reserved.
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页码：1073 / 1080
页数：7
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