摘要

研究了香港沉积微塑料（0.25-5毫米）的疏水性有机化合物（HOCs）的空间分布，组成和来源，包括多环芳烃（PAHs），多氯联苯（PCBs）和有机氯农药（OCPs）。 ΣPAHs的浓度在70.8和1509ngg-1之间，具有位点间差异，尽管区域差异不显着，表明PAHs的局部热解和石油输入。 ΣPCBs（13-1083ngg-1）的浓度随着研究地点和西部水域浓度较高的地区而变化，可能是由于珠江的输入。东海岸的OCP浓度显着提高，凸显了南海的捕捞和水产养殖活动，这是OCP的潜在主要来源。滴滴涕及其代谢产物（DDX，范围为1.96至626ngg-1）是OCP的主要形式（45％-80％）。由于大部分DDX都以滴滴涕的形式存在，这表明DDT在微塑料中有新的输入。由于微塑料和HOC不能有效地从环境中去除，减少潜在的生态毒理学风险应该依赖于最小化塑料和HOC的使用。

The spatial distribution, composition and source of hydrophobic organic compounds (HOCs) including polyaromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) and organochlorinated pesticides (OCPs) of the sedimentary microplastics (0.25-5 mm) in Hong Kong were investigated. The concentration of ΣPAHs ranged between 70.8 and 1509 ng g-1 with inter-site differences although the regional difference was insignificant, indicating localised pyrolytic and petrogenic input of PAHs. The concentration of ΣPCBs (13-1083 ng g-1) varied with both study sites and regions with higher concentrations obtained in the western waters, possibly due to the input from Pearl River. Significantly higher concentrations of OCPs on eastern shores highlighted fishing and aquaculture activities in South China Sea a potential major source of OCPs. DDT and its metabolites (DDX, ranged from 1.96 to 626 ng g-1) were the dominant forms of OCPs (45%-80%). Since most of the DDX existed as DDT, this suggested that there was a fresh input of DDT into the microplastics. As microplastics and HOCs cannot be removed effectively from the environment, reduction of potential ecotoxicological risks should rely on minimizing the use of plastics and HOCs.

https://www.ncbi.nlm.nih.gov/pubmed/30551108