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Mercury emissions monitoring & detection 

 

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In the mercury emissions monitoring & detection application, Atomic Absorption Spectrometers (AAS) is one of the typical analytical instruments to determine the mercury content. AAS is based upon the principle that free atoms in the ground state can absorb light of a certain wavelength. Absorption for each element is specific, and no other elements absorb this wavelength.

This single-element method is used for trace metal analysis of e.g. biological, metallurgical, pharmaceutical and atmospheric samples. Spectroscopic determination of atomic species can only be performed on a gasified sample in which the individual atoms such as Hg, Ag, Al, Au, Fe and Mg are well separated from each other.

The most common source for atomic absorption measurements is the hollow cathode lamp. It consists of a tungsten anode and a cylindrical cathode seated in a glass tube containing inert gas, such as HiQ Argon. The cathode is made of the element to be analyzed. HiQ Acetylene, HiQ Air & HiQ Nitrous Oxide can be used as detector gas in flame AAS. AAS instrument needs to be calibrated regularly to ensure the analysis accuracy. HiQ Gaseous Mercury Calibration Standards (≤ 1 µg/m3) can be supplied by Linde for this application.



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