Distribution and environmental significances of radionuclides in sediments of Dalian coastal area
DU Jin-qiu1,2, GUAN Dao-ming1,2, YAO Zi-wei2, GAO Hui2, WANG Zhen2, MENG Shu-feng2,3
1. Department of Marine Chemistry, Ocean University of China, Qingdao 266100, China;
2. National Marine Environmental Monitoring Center, Dalian 116023, China;
3. School of Marine Technology and Environment, Dalian Ocean University, Dalian 116023, China
Levels and distribution of 238U, 226Ra, 210Pb, 40K and 137Cs in surface sediment and sediment core samples collected from Dalian coastal area were analyzed, the influencing factors and sedimentation rates were discussed. The results showed that the horizontal level of individual radionuclide was similar. Characteristic of terrestrial input was obvious. On the vertical level, the content of 40K displayed no apparent change with depth, while the levels of other radionuclides fluctuated with depth increase, there was no significant change in the material input. A deficit in 226Ra was recorded in comparison with matrix 238U, excessive of 210Pb was recorded in comparison with matrix 226Ra, and a positive correlation between 137Cs and 40K existed .The sedimentation rate in Dalian coastal area was 0.49 and 0.43cm/a based on the methods of 210Pbex and 137Cs, respectively.
杜金秋, 关道明, 姚子伟, 高会, 王震, 孟书锋. 大连近海沉积物中放射性核素分布及环境指示[J]. 中国环境科学, 2017, 37(5): 1889-1895.
DU Jin-qiu, GUAN Dao-ming, YAO Zi-wei, GAO Hui, WANG Zhen, MENG Shu-feng. Distribution and environmental significances of radionuclides in sediments of Dalian coastal area. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(5): 1889-1895.
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