九龙江河口区水体中<sup>238</sup>U、<sup>234</sup>Th地球化学行为的研究

蔡平河; 黄奕普; 邱雨生

九龙江河口区水体中²³⁸U、²³⁴Th地球化学行为的研究

基金项目: 国家自然科学基金(编号:49376272)

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出版历程
- 收稿日期: 1995-07-23
- 修回日期: 1996-02-12

摘要

摘要: 对采自九龙江河口区盐度介于0～21.97的10个表层水样,铀、钍同位素的测定结果表明,九龙江河口区水体中溶解态的²³⁸U含量与盐度之间存在着良好的相关关系,其相关系数可达0.972,表明九龙江河口区水体中的²³⁸U呈现保守行为.当S=0时,溶解态²³⁴U/²³⁸U放射性比值为1.19和1.55(两份水样);而当S=0.90～21.97时,该比值=1.02～1.14,分别呈现河水及河口水铀同位素组成的特征.对于颗粒态铀,其²³⁸U含量则介于0.50～9.83×10^-3Bq/dm³,且随盐度的增大而呈逐步降低的趋势.九龙江河口区水体中²³⁴Th的地球化学行为属于非保守行为,不可逆稳态清除模型计算的结果表明,当盐度介于9.76～17.07时,²³⁴Th相对于化学清除的停留时间为6～19d,远低于盐度为0和21.97所对应的停留时间(分别为203d及117d),反映了在该盐度范围内,胶体絮凝沉降对溶解态234Th的快速清除作用.
- ²³⁸U /
- ²³⁴Th /
- 河口区 /
- 地球化学行为

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