Pollution characteristics of micro plastics and heavy metals in the intertidal zone sandy sediments of the offshore area of Qinhuangdao

Chen Yueqin; Luo Wei; Sun Conghui; Wu Guanghong

doi:10.3969/j.issn.0253-4193.2020.04.013

Volume 42 Issue 4

Nov. 2020

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Chen Yueqin，Luo Wei，Sun Conghui, et al. Pollution characteristics of micro plastics and heavy metals in the intertidal zone sandy sediments of the offshore area of Qinhuangdao[J]. Haiyang Xuebao，2020, 42(4)：113–121，doi:10.3969/j.issn.0253−4193.2020.04.013

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Pollution characteristics of micro plastics and heavy metals in the intertidal zone sandy sediments of the offshore area of Qinhuangdao

doi: 10.3969/j.issn.0253-4193.2020.04.013

1.
Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin 300387, China
2.
State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

Received Date: 2019-06-04
Rev Recd Date: 2019-09-15

Available Online: 2020-11-18

Publish Date: 2020-04-25

Abstract

Abstract

Micro plastics in sandy sediments collected from the intertidal zone of the offshore area of Qinhuangdao were floated by saturated NaCl solution and filtrated with membrane filter. Micro plastic particles were observed using microscope and infrared spectroscopy to discuss the origin and morphology. The surface morphology of micro plastics particles was characterized by scanning electron microscopy-energy dispersive spectrometer (SEM-EDS) to analyze surface morphology and elements. The geo accumulation indexes (I_geo) and enrichment factors (EF) were used to study the pollution level and enrichment of heavy metals (Hg, Cd and Pb) in sandy sediments. Total organic carbon (TOC), total nitrogen (TN) and loss on ignition (LOI) and stable isotopes of carbon and nitrogen (δ¹³C and δ¹⁵N) in sandy sediments were determined in order to analyze the source characteristics. The results indicated that there were three types of micro plastics: fiber, foam and film. Fiber was in the majority of micro plastics. Micro plastic particles were enriched with Si, Al, Mg, Fe and Ca in the surface. Hg and Cd were seriously enriched, and Pb was not enriched in the sandy sediments. The concentrations of TOC and TN were low; TOC/TN ratio and stable isotopic composition of C and N (δ¹³C and δ¹⁵N) indicated that TOC originated from marine plankton algae.
- Qinhuangdao,
- intertidal zone,
- micro plastics,
- heavy metals,
- nutrients

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References(30)

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