3 years ago

Effect of growth rate and pH on lithium incorporation in calcite

A. Füger, F. Konrad, A. Leis, M. Dietzel, V. Mavromatis

Publication date: Available online 8 January 2019

Source: Geochimica et Cosmochimica Acta

Author(s): A. Füger, F. Konrad, A. Leis, M. Dietzel, V. Mavromatis

Abstract

Carbonates are only a minor sink of oceanic lithium, yet the presence of this element and its abundance relative to other metal cations in natural carbonate minerals is routinely used as a paleo-environmental proxy. To date, however, experimental studies on the influence of physicochemical parameters that may control lithium incorporation in calcite, like pH and precipitation rate, are scarce. Therefore, we experimentally studied Li incorporation in calcite to quantify the apparent partitioning coefficient (DLi=cLi/cCacalcitemLi+/mCa2+solution) between calcite and reactive fluid as a function of calcite growth rate and pH. The obtained results suggest that DLi increases with calcite growth rate, according to the expression:LogDLi=1.331(±0.116)×LogRate+6.371(±0.880)(R2=0.87;10-8.1Rate10-7.1molm-2s-1)

Additionally the experimental results suggest that DLi values exhibit a strong pH dependence. For experiments conducted at similar growth rates (i.e. Rate=10-7.7±0.2 mol m-2 s-1), DLi decreases with increasing pH as described by:LogDLi=-0.57(±0.047)×pH+0.759(±0.366)(R2=0.90;6.3<pH<9.5)

The positive correlation of

Publisher URL: https://www.sciencedirect.com/science/article/pii/S001670371930002X

DOI: S001670371930002X

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.