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Abstract Title: Variability of Wet Mercury Deposition Measurements Using Different Types of Samplers
Presenter Name: Guey-Rong Sheu
Company/Institution: National Central University
Session: Atmospheric Hg cycling: Source and Emissions
Day and Session: Wednesday 27th July - Session Three
Start Time: 14:00 UTC
Co-Authors: Guey-Rong Sheu,Da-Wei Lin,Kohji Marumoto,David Gay,David Schmeltz,Chihwei Chang

Abstract Information :

Wet mercury (Hg) deposition is usually quantified by analyzing the total Hg concentrations in rainwater samples that are collected by wet deposition samplers. However, there is no standard type of wet deposition sampler globally. For example, the N-CON collector is used at some sampling sites of Mercury Deposition Network (MDN) in North America, while MIC-B type collector is used by the Asia Pacific Mercury Monitoring Network (APMMN) and Taiwan?s wet Hg deposition monitoring network. KASC-02 collector is used in Japan. These wet deposition samplers vary in shapes, sensors, sampling trains, and hence sampling efficiencies, which may cause measurement bias in Hg concentrations of rainwater samples being collected by different types of samplers. To approach this issue, a sampler inter-comparison study has been conducted on the campus of National Central University in Taiwan in 2020-2021. One N-CON, one KASC-02 and two MIC-B wet deposition samplers were set up side by side to collect weekly rainwater samples concurrently. Rainwater Hg concentrations between the two MIC-B samplers were well correlated (R2 = 0.97) with a slope of 1.09. Rainwater Hg concentrations between N-CON and MIC-B samplers were also well correlated (R2 = 0.97) with a slope of 0.84, with N-CON rainwater Hg concentrations being 16% lower than those of MIC-B samples. Rainwater Hg concentrations between KASC-02 and MIC-B samplers were also well correlated (R2 = 0.96) with a slope of 0.99, indicating very good agreement between KASC-02 and MIC-B samplers.

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