Automated calibration of atmospheric oxidized mercury measurements

Seth Lyman, Colleen Jones, Trevor O'Neil, Tanner Allen, Matthieu Miller, Mae Sexauer Gustin, Ashley M. Pierce, Winston Luke, Xinrong Ren, Paul Kelley

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The atmosphere is an important reservoir for mercury pollution, and understanding of oxidation processes is essential to elucidating the fate of atmospheric mercury. Several recent studies have shown that a low bias exists in a widely applied method for atmospheric oxidized mercury measurements. We developed an automated, permeation tube-based calibrator for elemental and oxidized mercury, and we integrated this calibrator with atmospheric mercury instrumentation (Tekran 2537/1130/1135 speciation systems) in Reno, Nevada and at Mauna Loa Observatory, Hawaii, U.S.A. While the calibrator has limitations, it was able to routinely inject stable amounts of HgCl2 and HgBr2 into atmospheric mercury measurement systems over periods of several months. In Reno, recovery of injected mercury compounds as gaseous oxidized mercury (as opposed to elemental mercury) decreased with increasing specific humidity, as has been shown in other studies, although this trend was not observed at Mauna Loa, likely due to differences in atmospheric chemistry at the two locations. Recovery of injected mercury compounds as oxidized mercury was greater in Mauna Loa than in Reno, and greater still for a cation-exchange membrane-based measurement system. These results show that routine calibration of atmospheric oxidized mercury measurements is both feasible and necessary.

Original languageEnglish
Pages (from-to)12921-12927
Number of pages7
JournalEnvironmental Science and Technology
Volume50
Issue number23
DOIs
Publication statusPublished - 6 Dec 2016

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    Lyman, S., Jones, C., O'Neil, T., Allen, T., Miller, M., Gustin, M. S., ... Kelley, P. (2016). Automated calibration of atmospheric oxidized mercury measurements. Environmental Science and Technology, 50(23), 12921-12927. https://doi.org/10.1021/acs.est.6b04211