DISTRIBUTION AND ACCUMULATION OF ARSENIC, CADMIUM AND MERCURY IN COASTAL WETLAND SEDIMENT OF NORTHERN BEIBU GULF

GAN Huayang; LIANG Kai; LIN Jinqing; ZHENG Zhichang; YAN Zhangcun

doi:10.3724/SP.J.1140.2013.03015

2013 Vol. 33, No. 3

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Article navigation > Marine Geology & Quaternary Geology > 2013 > 33(3): 15-28

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GAN Huayang, LIANG Kai, LIN Jinqing, ZHENG Zhichang, YAN Zhangcun. DISTRIBUTION AND ACCUMULATION OF ARSENIC, CADMIUM AND MERCURY IN COASTAL WETLAND SEDIMENT OF NORTHERN BEIBU GULF[J]. Marine Geology & Quaternary Geology, 2013, 33(3): 15-28. doi: 10.3724/SP.J.1140.2013.03015

Citation:

GAN Huayang, LIANG Kai, LIN Jinqing, ZHENG Zhichang, YAN Zhangcun. DISTRIBUTION AND ACCUMULATION OF ARSENIC, CADMIUM AND MERCURY IN COASTAL WETLAND SEDIMENT OF NORTHERN BEIBU GULF[J]. Marine Geology & Quaternary Geology, 2013, 33(3): 15-28. doi: 10.3724/SP.J.1140.2013.03015

DISTRIBUTION AND ACCUMULATION OF ARSENIC, CADMIUM AND MERCURY IN COASTAL WETLAND SEDIMENT OF NORTHERN BEIBU GULF

Division of Marine Environmental and Engineering Geology, Guangzhou Marine Geological Survey, Guangzhou 510760, China

Received Date: 28 February 2012

Revised Date: 30 May 2012

Abstract

Abstract

The spatial distribution, accumulation mechanism and controlling factors of Arsenic, Cadmium and Mercury in the last hundred years were studied based on the chemical and 210Pb, 137Cs dating data from the surface and coring sediments retrieved from the coastal wetland of north Beibu Gulf within a water depth of 0~6 m. The surface sediment is dominated by sand. The grain size of the sediment in the eastern part is coarser than that in the western part to the Dafeng river estuary. The contents of As, Cd, Hg and organic matter in the surface sediment are 8.11±5.80 μg/g、0.08±0.11 μg/g、0.034±0.028 μg/g and (0.73±0.74)%, respectively. High anomalies are found in the top part of the Tieshangang bay, the east estuary of the Nanliu river, the Qinzhou bay and the middle part of the Dafeng river estuary. Grain size is the principle factor controlling the elements distribution pattern in the surface sediment. The average sedimentation rates are 0.93 cm/a, 1.75 cm/a and 1.35 cm/a for the three cores collected from the Qin river estuary, Nanzhou (Nanliu) river estuary and Shankou mangrove conservation area during the period from 1920s to 2008, determined by 210Pb and 137Cs dating. The contents of As, Cd and Hg show an increasing trend in the period from 1985s to 2008, particularly for the cores retrieved from the estuaries of Qin river and Nanliu river due to the impacts of human activities.
- Arsenic,Cadmium,Mercury /
- distribution and accumulation /
- sediment /
- coastal wetland /
- northern Beibu Gulf

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