A magnetic record of heavy metal pollution in the Yangtze River subaqueous delta

Chenyin Dong, Weiguo Zhang, Honglei Ma, Huan Feng, Honghua Lu, Yan Dong, Lizhong Yu

Research output: Contribution to journalArticleResearchpeer-review

32 Citations (Scopus)

Abstract

The rapid industrial development in the Yangtze River watershed over the last several decades has drawn great attention with respect to heavy metal pollution to the Yangtze River estuary and nearby coastal areas. In this study, a 236cm long sediment core was retrieved from the Yangtze River subaqueous delta (122°36' E, 31°00' N) in 2008 and analyzed for magnetic properties and geochemical compositions to investigate heavy metal pollution history. The activity of 137Cs peaked at depth 140cm, with a broad plateau between 120cm and 140cm, suggesting an average sedimentation rate of 3.11cmyr-1 for the upper 140cm layer. Magnetic susceptibility (χ), saturation isothermal remanent magnetization (SIRM), anhysteretic remanent magnetization (χARM) and heavy metal enrichment factors (EF) all showed an upward increase trend above depth 140cm, suggesting that increased ferrimagnetic mineral concentration was accompanied by heavy metal enrichment in the sediment. Geochemical and granolumetric analyses showed that sediment sources and particle sizes played minor roles in the variations of magnetic properties. The effect of diagenesis, which can lead to the selective removal of magnetic minerals, was noticeable in the lower part of the core (140-236cm). Co-variation between magnetic properties (χ, SIRM and χARM) and EF of Cu and Pb suggests that the elevated ferrimagnetic mineral concentration can be used as an indicator of heavy metal pollution in the reconstruction of environmental changes in estuarine and coastal settings.

Original languageEnglish
Pages (from-to)368-377
Number of pages10
JournalScience of the Total Environment
Volume476-477
DOIs
StatePublished - 1 Apr 2014

Fingerprint

Heavy Metals
Heavy metals
remanent magnetization
Pollution
Rivers
heavy metal
Magnetization
magnetic property
pollution
Minerals
Magnetic properties
Sediments
river
saturation
magnetic mineral
Estuaries
industrial development
mineral
magnetic susceptibility
Watersheds

Keywords

  • Diagenesis
  • Heavy metal pollution
  • Magnetic properties
  • Particle size
  • Yangtze River subaqueous delta

Cite this

Dong, Chenyin ; Zhang, Weiguo ; Ma, Honglei ; Feng, Huan ; Lu, Honghua ; Dong, Yan ; Yu, Lizhong. / A magnetic record of heavy metal pollution in the Yangtze River subaqueous delta. In: Science of the Total Environment. 2014 ; Vol. 476-477. pp. 368-377.
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A magnetic record of heavy metal pollution in the Yangtze River subaqueous delta. / Dong, Chenyin; Zhang, Weiguo; Ma, Honglei; Feng, Huan; Lu, Honghua; Dong, Yan; Yu, Lizhong.

In: Science of the Total Environment, Vol. 476-477, 01.04.2014, p. 368-377.

Research output: Contribution to journalArticleResearchpeer-review

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