Historical evolutions of metal contamination in the Guangdong-Hong Kong-Macao Greater Bay Area: A risk assessment based on the fuzzy comprehensive assessment in the Daya Bay

Qu Baoxiao; Song Jinming; Yuan Huamao

doi:10.3969/j.issn.0253-4193.2020.10.006

Volume 42 Issue 10

Nov. 2020

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Qu Baoxiao，Song Jinming，Yuan Huamao. Historical evolutions of metal contamination in the Guangdong-Hong Kong-Macao Greater Bay Area: A risk assessment based on the fuzzy comprehensive assessment in the Daya Bay[J]. Haiyang Xuebao，2020, 42(10)：59–69 doi: 10.3969/j.issn.0253-4193.2020.10.006

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Historical evolutions of metal contamination in the Guangdong-Hong Kong-Macao Greater Bay Area: A risk assessment based on the fuzzy comprehensive assessment in the Daya Bay

doi: 10.3969/j.issn.0253-4193.2020.10.006

Qu Baoxiao^{1, 2, 3, 4
,},
Song Jinming^{1, 2, 3, 4
,
,},
Yuan Huamao^{1, 2, 3, 4}

1.
Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.
Marine Ecology and Environmental Sciences Laboratory, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China
4.
Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China

Received Date: 2019-07-05
Rev Recd Date: 2019-09-17

Available Online: 2020-11-13

Publish Date: 2020-10-25

Abstract

Abstract

The metal contents in the core sediments collected from the Daya Bay, a typical marine environment in the Guangdong-Hong Kong-Macao Greater Bay Area were measured in this study. National standard for marine sediment quality and fuzzy comprehensive assessment were applied to evaluate the historical evolution of the sediment quality in the past one hundred years. Our results indicate that the metal contamination in the bay experienced three major stages: (1) Before 1980s, the concentrations of most metals were low and the sediment quality fell into the category of class I. Accordingly, the metal risk was low in this period. Cr contributed most and Cd contributed least to the risk, respectively. (2) Between 1980 and 2000, the metal contents were significantly higher than the background values, suggesting that there was a sharp increase of metal input. The category of sediment quality fell down to class II and class III. However, the sediments in the margin areas of the Daya Bay were only slightly affected and still belonged to class I quality. Cu acted as a major metal pollutant instead of Cr in this period. (3) After the year of 2000, the metal levels and the metal risk decreased sharply. The sediment quality recovered back to class I and Cr contributed most to the risk at the time.
- Guangdong-Hong Kong-Macao Greater Bay Area,
- Daya Bay,
- sediment,
- heavy metals,
- pollution,
- fuzzy comprehensive assessment

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References(19)

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