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Mar Pollut Bull. 2018 Oct;135:1035-1041. doi: 10.1016/j.marpolbul.2018.08.038. Epub 2018 Aug 23.

Distribution and enrichment of trace metals in surface marine sediments collected by the manned submersible Jiaolong in the Yap Trench, northwest Pacific Ocean.

Author information

1
National Deep Sea Center, State Oceanic Administration, Qingdao 266237, China; Ocean University of China, Qingdao 266100, China.
2
National Deep Sea Center, State Oceanic Administration, Qingdao 266237, China. Electronic address: cz891111@ndsc.org.cn.
3
Dept. of Marine Science & Technology, Federal University of Technology, Akure 340252, Nigeria.
4
National Deep Sea Center, State Oceanic Administration, Qingdao 266237, China. Electronic address: yym@ndsc.org.cn.
5
National Deep Sea Center, State Oceanic Administration, Qingdao 266237, China.

Abstract

In this study, we carried out grain size and heavy metal analyses and also assessed heavy metal enrichment and ecological risk indices in ten sediment samples collected by the manned submersible Jiaolong at different segments of the Yap Trench. The results showed that the sediments in the Yap Trench were mainly slumping deposits composed of sandy silt. Heavy metals in the sediments showed different spatial distribution patterns from north to south direction of the trench. The distribution pattern of these heavy metals also differed in the eastern and western flanks of the trench. From the results of the enrichment factors, only arsenic, chromium, and manganese showed a slight enrichment. However, all elements were affected by natural factors. Further, most elements showed a low ecological risk, and only arsenic showed a moderate risk at two stations. Finally, the potential ecological risk of the whole study area was at a low level.

KEYWORDS:

Deep-sea sediment pollution; Ecological risk; Hadal zone; Heavy metals; Manned submersible Jiaolong; Yap Trench

PMID:
30300997
DOI:
10.1016/j.marpolbul.2018.08.038
[Indexed for MEDLINE]

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