Welcome to MercOx project


The Need for the Project

Hg is one of the most toxic metals. In the atmosphere, three forms of Hg exists: gaseous elemental mercury (GEM), gaseous oxidised mercury (GOM), and particulate bound mercury (PBM). Currently, traceable calibration methods only exist for elemental mercury (Hg(0)). However, such measurements are also needed for oxidised Hg species, i.e. Hg(II) to meet the requirements of EU regulation and the implementation of the Minamata Convention. For the control and assessment of Hg concentrations in the environment, it is essential to be able to monitor all Hg species. Therefore, the main challenges of this project are:

the development of reliable and direct Hg(II) measurement techniques and reliable and traceable Hg(II) standards;
methods for accurately comparing the Hgtot concentration in generated elemental and oxidised Hg reference gas standards;
to improve sampling methods, traceable reference standards, validated methods for the on-line measurement of Hg in the atmosphere and under field conditions, and a comparison of Hg species inter-conversion;
to trace the origin and fate of atmospheric Hg by using the Hg isotopic signatures.
Mercury cycling in the environment (Adopted from Gustin et al., 2016)
Mercury cycling in the environment (Adopted from Gustin et al., 2016) - Click to enlarge
12 +
28 +
Letters of
136 +
Top scientists working
towards same goal.


On metrology, economy,
environment and health.

News & Activites

Latest Entries


EMPIR project coordinator given lifetime achievement award for mercury research

New measurements of reactive forms of mercury will support enforcement of effective air pollution monitoring The project EMPIR project Metrology for oxidised mercury (16ENV01, MercOx) has been working to address a previously existing gap in capability and traceable measurements for mercury. The aim is to enhance the monitoring and control of mercury and its different chemical forms, in both...

Read More ...

Stakeholder events

Global mercury assesment meeting: GMA Expert Group Meeting

will be held at the Jožef Stefan Institute, Department of Environmental Sciences, from November 21st to November 22nd, 2017.

Read More ...

Workshops & Courses

CENAM W5 Creating Impact (2018)

In the framework of the project: "Development and implementation of analytical tools for the assurance of quality and traceability in the measurements of toxic elements (Hg) in fish of the Amazon", financed by the "Regional Fund for the Quality Infrastructure for biodiversity and climate protection in Latin America and the Caribbean ", two meetings where carried out:Kick-off Meeting "Definition...

Read More ...

Our worldwide partners

Optoseven logo M1


  • Jožef Stefan Institute
  • Jamova cesta 39, 1000 Ljubljana, Slovenia
  • Phone: +386 1 477 39 00
  • Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
  • Project Coordinator
  • Prof. Milena Horvat, Ph.D.
  • Head, Department of Environmental Sciences
  • Phone: +386 1 5885 389
  • Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
QR Code
founder logo

The EMPIR initiative is co-funded by the European Union's Horizon 2020 research and innovation programme and the EMPIR Participating States