Project Details Critical evaluation of homogeneous equilibrium and solubility constants of gadolinium in environmental and biological-relevant conditions

Project No.:
Start Date:
15 October 2018
End Date:


There are a number of trace elements that until recently were only considered to be laboratory curiosities but which have now become essential components in a variety of applications ranging from information and communication technologies, semiconductors, electronic displays and optic/photonic and ‘green energy’ related technologies. Their current strategic importance is such that these elements have now been labeled as ‘energy-critical elements’ or ‘technology-critical elements’ (TCEs) and initiatives at national levels are underway to secure their availability in the coming years. TCEs have diverse chemistries and uses. The degree of the current knowledge on their environmental fate and (eco)toxicity is not uniform, ranging from relatively well studied elements, such as the platinum group, to essentially unknown ones, such as tellurium. But for all of them, fundamental thermodynamic data are lacking.

The objective of this project is the compilation and critical evaluation of existing data for gadolinium. This will allow a ‘best set’ to be immediately used by stakeholders and the sound identification of the systems that require urgent data acquisition. Gadolinium is an element of increasing concern because its concentration are steadily increasing in surface waters world-wide.


The project will follow the usual procedure in SSED critical compilations: gathering of data, extraction, analysis of their quality, publication of the results.
Working plan:
– 1 January 2019 – 31 December 2019: gathering of all published data.
– 1 January 2020 – 30 June 2020: extraction of data and circulation among some SSED members.
– 1 July 2020 – 31 December 2020: preparation and publication of critical account.


New project announced in Chem Int Jan 2019, p. 40

April 2020 update: The work is progressing as scheduled. It is focused now on the extraction of available data for inorganic ligands.

Page last update 13 Apr 2020