Adsorption of Th and Pa onto particles and the effect of organic compounds in natural seawater

Xinxing ZHANG; Weifeng YANG; Yusheng QIU; Minfang ZHENG

doi:10.1007/s00343-021-0297-5

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Adsorption of Th and Pa onto particles and the effect of organic compounds in natural seawater

Chemistry | Updated：2023-05-20

- Adsorption of Th and Pa onto particles and the effect of organic compounds in natural seawater
- Journal of Oceanology and Limnology Vol. 39, Issue 6, Pages: 2209-2219(2021)
- Affiliations：
  
  1.College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
  2.North China Sea Environmental Monitoring Center, State Oceanic Administration, Qingdao 266033, China
  3.State Key Laboratory of Marine Environmental Science, Xiamen 361102, China
- Author bio：
  
  Weifeng YANG, E-mail: wyang@xmu.edu.cn
- Funds：
- DOI：10.1007/s00343-021-0297-5
  CLC：
- Received：01 August 2020，
  
  Accepted：25 November 2020，
  
  Online First：24 December 2020，
  
  Published：2021-11
- Accepted：
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Xinxing ZHANG, Weifeng YANG, Yusheng QIU, et al. Adsorption of Th and Pa onto particles and the effect of organic compounds in natural seawater[J]. Journal of Oceanology and Limnology, 2021, 39(6): 2209-2219.
DOI：

Xinxing ZHANG, Weifeng YANG, Yusheng QIU, et al. Adsorption of Th and Pa onto particles and the effect of organic compounds in natural seawater[J]. Journal of Oceanology and Limnology, 2021, 39(6): 2209-2219. DOI： 10.1007/s00343-021-0297-5.

摘要

Abstract

231

Pa and

230

Th are two crucial isotopes in the ongoing GEOTRACES Project. However

the controversy on

231

Pa/

230

Th proxy pertaining to archiving ocean circulation or recording paleoproductivity

is still unresolved

partly owing to the unclear understanding of fractionation between

231

Pa and

230

Th during adsorption. In this study

controlled experiments were conducted to examine the adsorption of

234

Th and

233

Pa onto biogenic particles (SiO

and CaCO

)

authigenic minerals (MnO

and Fe

)

and lithogenic minerals (kaolinite

attapulgite

montmorillonite

and aluminum oxyhydroxides)

and the role of organic compounds in regulating the adsorption of

234

Th and

233

Pa in natural seawater was evaluated. The distribution coefficients (

presented as log

) varied from 3.56 to 6.05 and from 3.27 to 5.82 for

234

Th and

233

respectively. Fe

is the strongest sorbent for both

234

Th and

233

Pa. Most of the particles showed comparable log

values for either

234

Th (~4.8) or

233

Pa (~3.9) in the presence of dextran

indicating that the adsorption of Th and Pa is likely controlled by organic coating on particle surfaces. The fractionation factors (

Th/Pa

) of SiO

(3±1) and CaCO

(33±1) suggest in situ observed preferential scavenging of

230

Th to

231

Pa in the surface water of low- to mid-latitude regions and the nearly equal removal in the Antarctic Ocean where biogenic silica dominates the particle regime. The

Th/Pa

values of the lithogenic and biogenic particles indicate that

230

Th is scavenged prior to

231

Pa in the particle-scarce ocean interior. The equal scavenging of

230

Th and

231

Pa at the ocean margins and the ridge crests is dominated by high particle fluxes instead of particle composition control. These results imply that

230

Th/

231

Pa can be used as different proxies in different oceanic settings.

关键词

Keywords

references

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