TY - JOUR
T1 - Evaluating the performance of oxidized Hg reference gas generators in the range ng m−3 to μg m−3 by improved coupling with ICP-MS
AU - Petrov, Panayot
AU - Rajamäki, Timo
AU - Corns, Warren T.
AU - Goenaga-Infante, Heidi
N1 - Funding Information:
This project (MercOx 16ENV01, Metrology for oxidized mercury) has received funding from the EMPIR programme co-financed by the Participating States and from the European Union's Horizon 2020 research and innovation programme. The authors are grateful to prof. Milena Horvat from JSI for the valuable discussions regarding linearity and accuracy of liquid evaporative generators and to Steve Long (from NIST, USA) for providing two SRM materials used at the early stage of this project.
Funding Information:
This project (MercOx 16ENV01, Metrology for oxidized mercury) has received funding from the EMPIR programme co-financed by the Participating States and from the European Union's Horizon 2020 research and innovation programme . The authors are grateful to prof. Milena Horvat from JSI for the valuable discussions regarding linearity and accuracy of liquid evaporative generators and to Steve Long (from NIST, USA) for providing two SRM materials used at the early stage of this project.
Publisher Copyright:
© 2020
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/12
Y1 - 2020/12
N2 - We demonstrate a novel way to introduce a so-called Hg reference gas, produced by a gas generator, into an elemental detector, such as ICP-MS, and to directly measure gaseous oxidized mercury (GOM as HgCl2) at a wide range of concentrations, covering 4 orders of magnitude. The approach was tested using two types of generators based on the dilution of a gas saturated with mercury chloride vapours (from dry HgCl2 salt) and on the evaporation of aqueous HgCl2 standards. The former generator provided reference gas at μg m−3 concentrations, while the latter was applicable from low ng m−3 to μg m−3. The generation and measurement of gaseous Hg was achieved in real time without significant memory effects, and with a response time shorter than 5 min. This unique approach of direct measurement (without thermal conversion) of both gaseous elemental mercury (GEM) and GOM from environmentally relevant to industrial concentrations has been shown to offer the potential to significantly improve the reliability of Hg determination from gas generators. This, in the longer term, will be invaluable to improve accuracy of in-field Hg measurements.
AB - We demonstrate a novel way to introduce a so-called Hg reference gas, produced by a gas generator, into an elemental detector, such as ICP-MS, and to directly measure gaseous oxidized mercury (GOM as HgCl2) at a wide range of concentrations, covering 4 orders of magnitude. The approach was tested using two types of generators based on the dilution of a gas saturated with mercury chloride vapours (from dry HgCl2 salt) and on the evaporation of aqueous HgCl2 standards. The former generator provided reference gas at μg m−3 concentrations, while the latter was applicable from low ng m−3 to μg m−3. The generation and measurement of gaseous Hg was achieved in real time without significant memory effects, and with a response time shorter than 5 min. This unique approach of direct measurement (without thermal conversion) of both gaseous elemental mercury (GEM) and GOM from environmentally relevant to industrial concentrations has been shown to offer the potential to significantly improve the reliability of Hg determination from gas generators. This, in the longer term, will be invaluable to improve accuracy of in-field Hg measurements.
KW - Direct measurement
KW - Gaseous elemental mercury
KW - Gaseous oxidized mercury
KW - GEM
KW - GOM
KW - ICP-MS
KW - Reference gas
UR - http://www.scopus.com/inward/record.url?scp=85091904815&partnerID=8YFLogxK
U2 - 10.1016/j.aeaoa.2020.100090
DO - 10.1016/j.aeaoa.2020.100090
M3 - Article
AN - SCOPUS:85091904815
SN - 2590-1621
VL - 8
JO - Atmospheric Environment: X
JF - Atmospheric Environment: X
M1 - 100090
ER -