Analysis of Isotopic Compositions of Mercury Species in Atmospheric Particulates Based on Thermo-Desorption Technique
Mercury is a global environmental pollutant,its atmospheric transport,deposition,and cycling posing significant threats to ecosystems and human health.Atmospheric particulate matter serves as a crucial carrier for the phase transformation of mercury.Isotopes of particulate-bound mercury(PBM)are commonly utilized in studying the sources and transformation of atmospheric mercury.However,existing research has been limited to composition of total mercury isotope,lacking a comprehensive understanding of species-specific isotope signature and of atmospheric mercury behavior and transformation mechanisms.This study aims to establish a thermal decomposition method to separate different mercury forms in atmospheric particulate matter for accurate analysis of their isotopic compositions.This study employed a self-constructed pyrolysis apparatus to separate mercury species in atmospheric particulate matter samples.It identified the major forms of mercury in the actual atmospheric particulate matter(PBM)in Tianjin as organic-bound mercury(Hg-OM),β-mercury sulfide(β-HgS),and α-mercury sulfide(α-HgS).Additionally,the isotopic composition of different mercury species was analyzed.Results demonstrated the effectiveness of this method in discerning isotopic characteristics of various mercury forms in PBM,offering a new avenue for understanding the source-sink processes and environmental behavior of atmospheric mercury.
万方数据
维普
