Behavior of KCl sorbent traps and KCl trapping solutions used for atmospheric mercury speciation: stability and specificity
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Published:2021-10-13
Issue:10
Volume:14
Page:6619-6631
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Gačnik Jan, Živković IgorORCID, Ribeiro Guevara SergioORCID, Jaćimović Radojko, Kotnik Jože, De Feo Gianmarco, Dexter Matthew A., Corns Warren T., Horvat Milena
Abstract
Abstract. Atmospheric mercury speciation is of paramount importance
for understanding the behavior of mercury once it is emitted into the
atmosphere as gaseous elemental mercury (GEM), gaseous oxidized mercury (GOM) and
particulate-bound mercury (PBM). GOM and PBM can also be formed in the
atmosphere; their sampling is the most problematic step in the atmospheric
mercury speciation. GOM sampling with speciation traps composed of KCl
sorbent materials and KCl trapping solutions are commonly used sampling
methods, although the research conducted with them at ambient air
concentrations is limited. The results of the specificity test demonstrated
that the KCl sorbent traps are highly specific when using new traps, while
their specificity drops dramatically when they are reused. The results of
the stability test indicated that the highest Hg2+ losses (up to
5.5 % of Hg2+ loss) occur when low amounts of Hg2+ (< 1 ng) are loaded, due to a reduction of Hg2+ to Hg0. KCl trapping solutions have also been considered as a selective trapping media for GOM in atmospheric samples. A dimensionless Henry law constant was experimentally
derived and was used to calculate the solubility of elemental Hg in KCl
solution. The degree of GEM oxidation was established by purging elemental
Hg calibration gas into a KCl solution and determining the GOM trapped using
aqueous-phase propylation liquid–liquid extraction and gas chromatography–atomic fluorescence spectrometry (GC-AFS) measurement. A positive GOM
bias was observed due to the solubility and oxidation of GEM in KCl trapping
solutions, strongly suggesting that this approach is unsuitable for
atmospheric mercury speciation measurements.
Funder
Urad Republike Slovenije za Meroslovje Javna Agencija za Raziskovalno Dejavnost RS European Metrology Programme for Innovation and Research Horizon 2020 Framework Programme
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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