Application of confocal laser Raman spectroscopy on marine sediment microplastics

作者：LIU Jing,ZHANG Xin,DU Zengfeng,LUAN Zhendong,LI Lianfu,XI Shichuan,WANG Bing,CAO Lei,YAN Jun

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.

发文机构：Key Laboratory of Marine Geology and Environment&Center of Deep Sea Research Laboratory for Marine Geology University of Chinese Academy of Sciences Center for Ocean Mega-Science

关键词：microplasticsCONFOCALRamanspectroscopymarinesediment

分类号： P73[天文地球—海洋科学]