review · Environmental Science & Technology
Recent advances over the past decade have improved the understanding of atmospheric mercury, particularly oxidised mercury which accounts for 2 to 20 percent of atmospheric mercury. However, notable technical challenges persist regarding existing measurement methods for atmospheric mercury concentrations and the chemical composition of oxidised mercury compounds. Current techniques for measuring gaseous oxidised and particulate-bound mercury exhibit clear limitations, highlighting a need for new, more accurate analytical approaches. The preferred long-term objective is the creation of ultrasensitive methods capable of direct, online detection of oxidised mercury from ambient air. As an interim measure, researchers require specialised collection surfaces that can quantitatively capture oxidised mercury and allow reversible desorption to analyse its chemical properties. Accurately calibrated measurements are vital because atmospheric transport drives the global distribution of mercury and dictates its biogeochemical cycle.
Mercury is transported globally through the atmosphere, affecting worldwide ecosystems and biogeochemical cycles. Current tools cannot reliably measure oxidised atmospheric mercury compounds or determine their exact chemistry. Identifying these analytical limitations is critical for developing trustworthy environmental monitoring techniques that clarify how mercury moves and transforms across the planet.
This work identifies requirements for instrumentation developers and environmental monitoring specialists seeking to design next-generation analytical tools. Potential applications include new sampling surfaces for quantitative capture and thermal desorption, as well as ultrasensitive online instruments for ambient air testing. The work describes early-stage research needs and performance targets rather than a ready-to-market product.
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Mercury (Hg) researchers have made progress in understanding atmospheric Hg, especially with respect to oxidized Hg (Hg<sup>II</sup>) that can represent 2 to 20% of Hg in the atmosphere. Knowledge developed over the past ∼10 years has pointed to existing challenges with current methods for measuring atmospheric Hg concentrations and the chemical composition of Hg<sup>II</sup> compounds. Because of these challenges, atmospheric Hg experts met to discuss limitations of current methods and paths to overcome them considering ongoing research. Major conclusions included that current methods to measure gaseous oxidized and particulate-bound Hg have limitations, and new methods need to be developed to make these measurements more accurate. Developing analytical methods for measurement of Hg<sup>II</sup> chemistry is challenging. While the ultimate goal is the development of ultrasensitive methods for online detection of Hg<sup>II</sup> directly from ambient air, in the meantime, new surfaces are needed on which Hg<sup>II</sup> can be quantitatively collected and from which it can be reversibly desorbed to determine Hg<sup>II</sup> chemistry. Discussion and identification of current limitations, described here, provide a basis for paths forward. Since the atmosphere is the means by which Hg is globally distributed, accurately calibrated measurements are critical to understanding the Hg biogeochemical cycle.
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DOI: 10.1021/acs.est.4c06011
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