| 咸水环境下沉积物中镭的解吸特点 |
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| 关键词:sediments radium isotopes desorption diffusion salt water |
| 基金项目:国家自然科学基金项目(编号: 41072174) |
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| 摘要: |
| Characteristics of Radium Desorption from Sediments in the Salt Water Environment |
| Radium diffusion from sediments to overlying water is one of the important sources of radium isotopes in ocean water. A series of laboratory desorption/diffusion experiments were conducted to help elucidate the characteristics of sediments on 224Ra and 226Ra desorption and diffusion, which included 1) 224Ra and 226Ra desorption from sediments in water of different salinities, 2) 224Ra and 226Ra desorption from sediments of different grain sizes in water of the same salinity, 3) 224Ra and 226Ra diffusive fluxes by observing Ra enrichment with time in the overlying water of incubated sediments. The experimental results show that there is an increase in the amount of 224Ra and 226Ra with the increase of salinity from 5 to 30, and Ra desorption is strongest at the salinity of 25. Under the same salt water condition, 224Ra and 226Ra desorption activities of the four grain sizes (2000~1000 μm, 1000~500 μm, 500~250 μm and 250~125 μm) of sediments are very close to each other. When the grain sizes of sediments are larger than 2000μm, the 224Ra and 226Ra desorption activities are slightly higher than those of the sediments of the above-mentioned four grain sizes. When the grain sizes of sediments are less than 125 μm, the 224Ra and 226Ra desorption activities are much larger than those of the above-mentioned five grain sizes. The average diffusive fluxes of 224Ra and 226Ra of sediments from Jiaozhou Bay are 0.85 Bq?m-2?d-1 and 0.022 Bq?m-2?d-1, respectively. |
| YUAN Xiao-jie,GUO Zhan-rong,LIU Jie,MA Zhi-yong,WANG Bo.2014.Characteristics of Radium Desorption from Sediments in the Salt Water Environment[J].Acta Geoscientica Sinica,35(5):582-588. |
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