A large excess of 210Po in the overlying water of the Zhubi Coral Reef flat, in the South China Sea

► Large excess of 210Po was observed in the overlying water of the Coral Reef flat. ► Different mechanisms control the input of 210Po and removal of 210Pb. ► Diffusion of 210Po contributes more than 60% of the total 210Po. ► Preferential recycling of 210Po is related to interaction between 210Po and...

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Bibliographic Details
Published in:Marine pollution bulletin 2011-05, Vol.62 (5), p.912-917
Main Authors: Yang, W.F., Huang, Y.P., Chen, M., Qiu, Y.S., Li, H.B., Zhang, L.
Format: Article
Language:English
Subjects:
210Pb
210Po
Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
China
Coral Reef lagoon
Coral Reefs
Diffusion
Fractionation
Fundamental and applied biological sciences. Psychology
Geologic Sediments - chemistry
Lead Radioisotopes - analysis
Marine
Oceans and Seas
Pollution abatement
Polonium - analysis
Radiation Monitoring
Recycling
Sea water ecosystems
Seawater - chemistry
South China Sea
Synecology
Temporal logic
Water Pollutants, Radioactive - analysis
Water pollution
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Summary:► Large excess of 210Po was observed in the overlying water of the Coral Reef flat. ► Different mechanisms control the input of 210Po and removal of 210Pb. ► Diffusion of 210Po contributes more than 60% of the total 210Po. ► Preferential recycling of 210Po is related to interaction between 210Po and POM. The temporal variability of 210Po and 210Pb was examined in the overlying water of the Zhubi Coral Reef flat to detect nutrient-like behavior of 210Po. Different mechanisms influencing their geochemical behaviors were observed. Excess 210Po relative to 210Pb revealed an additional input of 210Po other than in situ production from 210Pb. The 210Po input comes from the reef flat sediment through diffusion. The diffusion contributes 62% of the total 210Po. This diffusion of 210Po directly highlights its nutrient-like behavior. No input, but the slight removal, of 210Pb was observed. Fractionation factors indicate that particulate matter prefers to adsorb 210Po rather than 210Pb. In combination with particulate composition, 210Po diffusion was closely related to organic matter. These results reveal that 210Po might be a potential tracer for quantifying nutrient recycling in the Coral Reef system.
ISSN:0025-326X
1879-3363
DOI:10.1016/j.marpolbul.2011.02.057