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Application of confocal laser Raman spectroscopy on marine sediment microplastics

查看全文 作　　者：LIU [1,3,4]Jing;ZHANG [1,2,3,4]Xin;DU [1,4]Zengfeng;LUAN [1,4]Zhendong;LI [1,3,4]Lianfu;XI [1,3,4]Shichuan;WANG [1,4]Bing;CAO [1,4]Lei;YAN [1,4]Jun 高影响力作者 机构地区：[1]Key Laboratory of Marine Geology and Environment&Center of Deep Sea Research,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;[2]Laboratory for Marine Geology,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China;[3]University of Chinese Academy of Sciences,Beijing 100049,China;[4]Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao 266071,China高影响力机构 出　　处：《Journal of Oceanology and Limnology》索引2020年第38卷第5期,共15页高影响力期刊 基　　金：Supported by the Laboratory for Marine Geology,Qingdao Pilot National Laboratory for Marine Science and Technology(No.MGQNLMTD201904);the NSFC-Shandong Joint Fund for Marine Science Research Centers(No.U1606401);the Key Research Program of Frontier Sciences,CAS(No.QYZDB-SSW-DQC004);the Young Taishan Scholars Program(No.tsqn201909158)。 摘　　要：Marine sediment is the primary sink of microplastics and is an indicator of pollution levels.However,although there are well-developed detection methods,detection is rarely focused on lowmicrometer-sized particles,mainly due to technique limitations.In this study,a simplifi ed process omitting digestion procedures was developed to pretreat microplastics obtained from marine sediment and was coupled with micro-Raman spectroscopy to identify microplastics.Based on the overall analysis of the characteristic peak assignments,a Raman spectral reference library was constructed for 18 types of plastic.In addition,the eff ects of the measurement parameters were systematically described.Field research was then conducted to validate the developed process and investigate microplastic contamination in Huiquan Bay,Qingdao,China.This simplifi ed process could retain the original appearance of microparticles and accomplish the detection of<500μm-sized microplastics in environmental samples.Microplastics in the size range of 10-150μm accounted for 76%of all microplastics,and 56%of the total particles was particles smaller than 50μm.Polypropylene(42%)and polyethylene(20%)were predominant components of the particles.In particular,polypropylene particles smaller than 10μm were identifi ed in marine sediment.This work demonstrates that Raman spectroscopy is not only an eff ective tool for detecting environmental particles but also highly applicable for identifying particles extracted from marine sediment. 关 键 词：microplastics CONFOCAL Raman spectroscopy marine sediment
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