Study on sorption, desorption behaviors and enrichment mechanism of iridium in marine sediments by radioactive tracer

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Study on sorption, desorption behaviors and enrichment mechanism of iridium in marine sediments by radioactive tracer

更新时间：2021-03-12

- Study on sorption, desorption behaviors and enrichment mechanism of iridium in marine sediments by radioactive tracer
- NUCLEAR TECHNIQUES Issue 3, (2000)
- 作者机构：
  
  1. 中国科学院高能物理研究所核分析技术开放研究实验室,北京,100080
  2. 中国科学院高能
- 作者简介：
- 基金信息：
  
  国家自然科学基金!29771031;中国科学院重大项目!21039751;核分析技术开放实验室资助
- DOI：
  CLC： O614.8
- Published：01 March 2000
- 稿件说明：
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[1]戴雄新,柴之芳,毛雪瑛,欧阳宏,张朝晖.用放射性示踪技术研究海洋沉积物中铱的吸附和解吸行为及其富集机制[J].核技术,2000(03):181-186.

Study on sorption, desorption behaviors and enrichment mechanism of iridium in marine sediments by radioactive tracer[J]. Nuclear techniques, 2000, (3): 181-186.
[1]戴雄新,柴之芳,毛雪瑛,欧阳宏,张朝晖.用放射性示踪技术研究海洋沉积物中铱的吸附和解吸行为及其富集机制[J].核技术,2000(03):181-186. DOI：

Study on sorption, desorption behaviors and enrichment mechanism of iridium in marine sediments by radioactive tracer[J]. Nuclear techniques, 2000, (3): 181-186. DOI：

摘要

利用放射性示踪技术，结合静态吸附、解吸实验及可见分光光度分析，研究了海洋沉积物一海水体系中铱的吸附及解吸行为。结果表明，在极低的铱浓度范围内，铱的吸附一解吸等温线呈线性，且吸附一解吸不可逆。 IrＣ１２6－形态的铱极易被沉积物所吸附，一旦吸附后又很难解吸下来。沉积物沉积过程中不断地吸附海水中的IrＣ１２6－可能致使铱累积于沉积物中，从而引起铱富集。丹麦鱼粘土对铱的吸附能力弱于近海洋沉积物，说明丹麦鱼粘土高含量铱来源于其它成因机制，如火山或地外成因。

Abstract

By using radiotracer technique

the sorption and desorption behaviors of iridium in marine sediment-seawater system were studied through the sorption and desorption experiments and visible absorption spectrum analysis. The results indicated that

in the range of very low iridium concentration

the sorption and desorption isotherms were linear

and the sorption-desorption process was irreversible. Iridium in the form of IrCl62- was very easy to be sorbed by the sediments. Once being sorbed by the sediments

Ir was hard to be desorbed. In the sedimentary process

the sediment continuously absorbed the species of IrCl62- from the seawater

which might lead to the Ir accumulation in the sediment. The sorption ability of the Danish K/T Fish Clay was weaker than that of the coastal sediment

which indicated that the excessively high Ir content in the Fish Clay might be caused by the other enrichment mechanisms

such as volcanic or extraterrestrial origin.

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