3月28日，课题组题为“Microplastics and polycyclic aromatic hydrocarbons (PAHs) in Xiamen coastal areas: implications for anthropogenic impacts”的研究论文被《Science of the Total Environment》期刊接收。

本研究选择微塑料和多环芳烃（PAHs）为代表物质，以快速工业化和城市化发展的厦门沿岸作为研究区域，采集并分析了海水与沉积物中微塑料与PAHs的分布，以及人为活动影响和二者之间潜在的关系。研究结果表明，表层海水微塑料丰度范围为103-2017个/m³，平均值为514.3个/m³；沉积物微塑料丰度范围为76-333个/kg，平均值为181个/kg；表层海水溶解态Σ13PAHs含量范围为18.1-248 ng L^-1，平均值为61.6 ng L^-1。在半封闭的西港中，表层海水和沉积物中微塑料丰度最高，可能是由于西港微弱的水动力交换过程所致。泡沫是表层海水中丰度最高的一种微塑料形态，而沉积物中却没有发现。镜检和傅里叶变换红外显微镜（FTIR）分析结果表明，聚乙烯（PE）和聚丙烯（PP）是研究区分布最广泛的塑料类型。

我们利用聚类分析（CA）探究不同形态微塑料和不同环数PAHs之间的关系，结果表明，纤维和颗粒具有相似的来源，薄膜和各种PAHs（3环PAHs、4环PAHs和烷基化PAHs）之间都存在良好的相关性。而相关性分析结果表明，农业活动中使用的塑料薄膜可能是研究区域内一种潜在的微塑料来源。我们的工作可以为未来研究河流径流量、流域面积、人口和城市化增长速率等对于河口表层水微塑料分布之间的关系提供数据支撑，以便在全国范围内更好地监测微塑料污染。

作者：唐国文，刘萌阳，周倩，何海霞，陈凯，章海波，胡佳慧，黄清辉，骆永明，柯红伟，陈斌，徐向荣，蔡明刚^*

^*通讯作者：mgcai@xmu.edu.cn

                                             图1 表层海水微塑料分布图

                                              图2 沉积物微塑料分布图

                                       图3 表层海水中PAHs含量分布图

Abstract

Microplastics and polycyclic aromatic hydrocarbons (PAHs) were investigated to study the influence of human activities and to find their possible relationship on the coastal environments, where the coastal areas around Xiamen are undergoing intensive processes of industrialization and urbanization in the southeast China. The abundance of microplastics in Xiamen coastal areas was 103 to 2017 particles/m³ in surface seawater and 76 to 333 particles/kg in sediments. Concentrations of dissolved PAHs varied from 18.1 to 248 ng/L in surface seawater. The abundances of microplastics from the Western Harbor in surface seawater and sediments were higher than those from other areas. Foams were dominated in surface seawater samples, however, no foams were found in sediments samples. The microscope selection and FTIR analysis suggested that polyethylene (PE) and polypropylene (PP) were dominant microplastics. The cluster analysis results demonstrated that fibers and granules had the similar sources, and films had considerably correlation with all types of PAHs (3 or 4-ring PAHs and alkylated PAHs). Plastic film mulch from agriculture practice might be a potential source of microplastics in study areas. Results of our study support that river runoff, watershed area, population and urbanization rate influence the distribution of microplastics in estuarine surface water, and the prevalence of microplastics pollution calls for monitoring microplastics at a national scale.