| 铀、钍在碳酸钙-海水界面的附着行为研究 |
| 其他题名 | Experimental study on the uptake of uranium and thorium at the interface of CaCO_3-seawater
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| 郭晓月; 王丕波; 王海荣; 瞿成利 ; 王卓
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| 发表期刊 | 海洋科学
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| ISSN | 1000-3096
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| 2014
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| 卷号 | 38期号:10页码:6-11 |
| 关键词 | 铀
钍
碳酸钙
海水
附着行为
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| 产权排序 | 烟台大学环境与材料工程学院; 国家海洋局北海分局北海海洋工程勘察研究院; 中国科学院烟台海岸带研究所 |
| 作者部门 | 支撑部门
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| 英文摘要 | 运用实验模拟的手段, 对铀(U)、钍(Th)在碳酸钙-海水界面的附着行为进行了初步研究, 通过测定相关的分异系数(D)定量评估了文石和方解石两种碳酸钙矿物对U 和Th 的捕集作用。实验结果显示,不仅U 和Th 之间存在显著差异, 而且两种碳酸钙矿物之间也存在明显不同。U 介于碳酸钙和海水之间的分异系数(D_U)分别在1.5~3.5(文石)和0.04~0.19(方解石)区间内变化, 分异行为非常微弱但其分异系数随着碳酸钙沉淀速率的增加而逐渐上升。这表明U 元素主要是以共沉淀的方式进入到文石或方解石沉淀中, 但由于其在海水溶液中主要以UO_2(CO_3) _n~(2-2n)的形式存在, 因而只能以占据晶格缺陷的方式进入碳酸钙。与之相反的是, 文石和方解石都对Th 表现出极强的捕集能力, 所测定的分异系数(D_(Th))分别在240~6330(文石)和430~6160(方解石)范围内变化, 但D_(Th)与碳酸钙沉淀速率之间无明显关联。 Th 在碳酸钙表面的附着行为可界定为单纯的吸附作用, 这一行为应与Th 主要以Th(OH)_4的形式赋存于溶液中有关。 |
| 中文摘要 | Using the constant addition system, the uptake of uranium and thorium at the interface of CaCO_3-seawater was investigated. Significant differences were observed not only between U and Th but also between aragonite and calcite. Partition coefficients of U (D_U) between CaCO_3 and seawater were determined to range from 1.5 to 3.5 for aragonite and 0.04 to 0.19 for calcite. The partitioning of U is very weak, but the value of D_U was observed to increase with increasing precipitation rates of aragonite or calcite. It suggests that U was incorporated into CaCO_3 precipitates via coprecipitation. However, because U(VI) is present in seawater in the form of UO_2 (CO_3)_n~(2-2n), the incorporation of U(VI) could only be achieved by the occupation of defect sites. As compared to U, Th could be strongly gathered by both calcite and aragonite. The partition coefficients of Th (D_(Th)) between CaCO_3 and seawater range from 240 to 6330 for aragonite and 430 to 6160 for calcite. However, there is no correlation between D_(Th) and CaCO_3 precipitation rates. The uptake of Th at the interface of CaCO_3-seawater was achieved simply via adsorption. Such behavior of Th(IV) should be related to dominance of Th(OH)_4 in our solutions. |
| 文章类型 | 期刊论文
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| 资助机构 | 国家自然科学基金项目,国家海洋局青年基金项目,山东省科技厅
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| 收录类别 | CSCD
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| 语种 | 中文
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| CSCD记录号 | CSCD:5300077
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://ir.yic.ac.cn/handle/133337/8489
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| 专题 | 支撑部门_所级公共技术服务中心
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推荐引用方式
GB/T 7714 |
郭晓月,王丕波,王海荣,等. 铀、钍在碳酸钙-海水界面的附着行为研究[J]. 海洋科学,2014,38(10):6-11.
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| APA |
郭晓月,王丕波,王海荣,瞿成利,&王卓.(2014).铀、钍在碳酸钙-海水界面的附着行为研究.海洋科学,38(10),6-11.
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| MLA |
郭晓月,et al."铀、钍在碳酸钙-海水界面的附着行为研究".海洋科学 38.10(2014):6-11.
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