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引用本文:孔凡翠,沙占江,杜金洲,苏维刚,胡菊芳,王求贵,马玉军,翟玉乐,王转,马海英.青海湖西岸镭同位素的解吸和扩散特征.湖泊科学,2016,28(5):1103-1114. DOI:10.18307/2016.0521
KONG Fancui,SHA Zhanjiang,DU Jinzhou,SU Weigang,HU Jufang,WANG Qiugui,MA Yujun,ZHAI Yule,WANG Zhuan,MA Haiying.Desorption and diffusion characteristics of radium isotopes from particles in the western part of Lake Qinghai. J. Lake Sci.2016,28(5):1103-1114. DOI:10.18307/2016.0521
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青海湖西岸镭同位素的解吸和扩散特征
孔凡翠1, 沙占江1,2, 杜金洲3, 苏维刚4, 胡菊芳1,5, 王求贵1,5, 马玉军2, 翟玉乐2, 王转2, 马海英6
1.中国科学院青海盐湖研究所, 青海省盐湖地质与环境重点实验室, 西宁 810008;2.青海师范大学, 青海省自然地理与环境过程重点实验室, 西宁 810008;3.华东师范大学, 河口海岸国家重点实验室, 上海 200062;4.青海省地震局预报中心, 西宁 810001;5.中国科学院大学, 北京 100049;6.青海省德令哈市国土资源局, 德令哈 817000
摘要:
对青海湖布哈河河口悬浮颗粒物、底部沉积物和青海湖湖底沉积物中的镭(Ra)同位素进行不同盐度和pH值的解吸实验以及扩散实验,得到不同盐度湖水(2.8‰、5.8‰、8.8‰、11.8‰和14.8‰)对悬浮颗粒物中镭的解吸活度,和不同时间段沉积物中镭同位素的扩散速率,探讨盐度、pH值与颗粒物中镭同位素解吸的关系.结果表明,224Ra的解吸活度均高于226Ra和228Ra的解吸活度;在盐度为12‰附近时布哈河河口悬浮颗粒物中223Ra、226Ra和228Ra的解吸程度达到最大值,当盐度<9‰时,226Ra解吸活度大于228Ra,当盐度>9‰时,228Ra的解吸活度大于226Ra,这可能与当地岩石中富铀矿有关.河流沉积物226Ra和228Ra的扩散速率分别是0.039和0.290 dpm/(m2·h);湖底沉积物226Ra和228Ra的扩散速率分别为0.018和0.092 dpm/(m2·h),湖底沉积物扩散速率小于河流沉积物扩散速率.
关键词:  镭同位素  解吸  扩散  布哈河口  青海湖
DOI:10.18307/2016.0521
分类号:
基金项目:中国科学院百人计划项目“高原内陆盐湖水环境生物地球化学过程”、中国科学院青海盐湖研究所青年引导基金B类项目和青海省科技厅自然基金项目“大柴旦周围水体中锂的地球化学分布规律及对盐湖补给通量研究”(2016-ZJ-921Q)联合资助.
Desorption and diffusion characteristics of radium isotopes from particles in the western part of Lake Qinghai
KONG Fancui1, SHA Zhanjiang1,2, DU Jinzhou3, SU Weigang4, HU Jufang1,5, WANG Qiugui1,5, MA Yujun2, ZHAI Yule2, WANG Zhuan2, MA Haiying6
1.Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, P. R. China;2.Key Laboratory of Natural Geography and Environmental Process in Qinghai Province Education, Qinghai Normal University, Xining 810008, P. R. China;3.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, P. R. China;4.Qinghai Seismological Bureau Forecast Center, Xining 810001, P. R. China;5.University of Chinese Academy of Sciences, Beijing 100049, P. R. China;6.The Land and Resources Bureau of Delingha City, Delingha 817000, P. R. China
Abstract:
Two laboratory experiments for Radium desorption and diffusion were conducted in this work, which included 1) the Radium desorption of sediments that were under different salinities (2.8‰, 5.8‰, 8.8‰, 11.8‰ and 14.8‰) from the lake water and the potential of hydrogen from Buha River estuary. 2) Radium diffusive fluxes with time in the overlying water of lake sediments and in river sediments. We have got the desorbed activity of Radium from the suspended particles and Radium diffusion fluxes from surface sediments. The results show that the desorption activities of 224Ra are higher than those of 226Ra and 228Ra, and the desorption degrees of 224Ra, 226Ra and 228Ra have reached the maximum value when the salinity near 12‰. The desorption of 226Ra activities are greater than that of 228Ra when salinity<9‰, however, when salinity>9‰, the desorption activities of 226Ra is less than that of 228Ra, which may be associated with the local rich uranium. The diffusion fluxes of 226Ra and 228Ra of sediments from Buha River are 0.039 and 0.290 dpm/(m2·h), respectively, and they are 0.018 and 0.092 dpm/(m2·h) from Lake Qinghai, respectively. The Radium diffusion fluxes of sediments in Lake Qinghai are less than that of the river.
Key words:  Radium isotopes  desorption  diffusion  Buha River estuary  Lake Qinghai
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