Laser-based absorption spectroscopy is an important method for determining the concentration of gas components in a sample. Modern devices are highly specialised for detecting very specific gases, .
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Founded in February 2018 as an Empa spin-off, the start-up company "MIRO Analytical" received one of the coveted "Innosuisse Certificates" in October. The certificate reflects the remarkable progr .
Jun 01 2021
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A primary mercury gas standard was developed at VSL to establish an SI-traceable reference point for mercury concentrations at emission and background levels in the atmosphere. The primary gas standard has been developed as a mercury gas generator to establish metrological traceability of mercury concentration measurement results, based upon a gravimetric approach, for ambient air levels as well as higher concentrations.
The working principle of the primary mercury vapour generator is based on diffusion according to ISO 6145-8:2005. Specially developed stainless-steel diffusion cells are filled with approximately 2 mL of elemental mercury. The mercury vapour diffuses from the cell through a capillary. To obtain several diffusion ranges, cells with different capillary diameters are used. By weighing the diffusion cells at regular time intervals on a high-resolution analytical balance the mercury mass flow rate (diffusion) is