Abstract：
Most previous measurements of oxidized mercury were collected using a method now known to be biased low. In this study, a dual-channel system with an oxidized mercury detection limit of 6-12 pg m-3 was deployed alongside a permeation tube-based automated calibrator at a mountain top site in Steamboat Springs Colorado, USA, in 2021 and 2022. Permeation tubes containing elemental mercury and mercury halides were characterized via an International System of Units (SI)-traceable gravimetric method and gas chromatography/mass spectrometry before deployment in the calibrator. The dual-channel system recovered 97 ± 4 and 100 ± 8% (±standard deviation) of injected elemental mercury and HgBr2, respectively. Total Hg permeation rates and Hg speciation from the gravimetric method, the chromatography system, the dual-channel system, and an independent SI-traceable measurement method performed at the Jožef Stefan Institute laboratory were all comparable within the respective uncertainties of each method. These are the first measurements of oxidized mercury at low environmental concentrations that have been verified against an SI-traceable calibration system in field conditions while sampling ambient air, and they show that accurate, routinely calibrated oxidized mercury measurements are achievable.
摘要：
以前大多数氧化汞的测量是使用现在已知的低偏置方法收集的。在这项研究中,在科罗拉多州SteamboatSprings的山顶站点上，与基于渗透管的自动校准器一起部署了氧化汞检测极限为6-12pgm-3的双通道系统，美国,2021年和2022年。含有元素汞和卤化汞的渗透管在部署到校准器之前，通过国际单位制（SI）可追溯的重量分析法和气相色谱/质谱法进行了表征。双通道系统分别回收了97±4和100±8％（±标准偏差）的注入元素汞和HgBr2。重量法测定的总汞渗透率和汞形态，色谱系统，双通道系统，在JoçefStefan研究所实验室进行的独立SI可追溯测量方法在每种方法的各自不确定度内都具有可比性。这些是在低环境浓度下对氧化汞的首次测量，在对环境空气进行采样的同时，在现场条件下对SI可追踪校准系统进行了验证。他们显示了准确的，常规校准的氧化汞测量是可以实现的。
