Comparability of calibration strategies for measuring mercury concentrations in gas emission sources and the atmosphere

Abstract. A primary mercury gas standard was developed at Van Swinden Laboratory (VSL) to establish an International System of Units (SI)-traceable reference point for concentrations emission and background levels in the atmosphere. The majority concentration measurements are currently made traceable empirically determined vapour pressure mercury. can be used accurate precise calibration analytical systems measuring air. It has been especially support related ambient air monitoring (1–2 ng m?3), indoor workplace-related according health standards (from 50 m?3 upwards) as well stationary source emissions 1 µg upwards). is based on diffusion ISO 6154-8. Calibration mixtures obtained by combining calibrated mass flows nitrogen through a generator holding cells containing elemental In this paper, we present results comparisons between methods maintained NPL (National Physical United Kingdom), National Metrology Institute (NMI), Jozef Stefan (JSI), Designated (DI). JSI bell-jar apparatus combination with Dumarey equation or NIST Standards Technology States) material. For comparisons, sampled sorbent traps obtain transfer 2 1000 expanded uncertainty not exceeding 3 % (k=2). performed show that material comparable, whereas difference ?8 exists equation.