Temperature dependence of Hg vapour mass concentration at saturation in air: New SI traceable results between 15 and 30°C
| Autor: | Richard J. C. Brown, Christophe R Quétel, Mariavittoria Zampella |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010504 meteorology & atmospheric sciences
Analytical chemistry chemistry.chemical_element Trapping Isotope dilution 01 natural sciences Analytical Chemistry Isotope dilution mass spectrometry Measurement procedure validation Environmental Chemistry Inductively coupled plasma mass spectrometry Closed circuit Spectroscopy 0105 earth and related environmental sciences Hg vapour mass concentration Temperature dependent evolution Gaseous mercury ISO/IEC 17025 SI traceable results Chemistry Internationally recommended reference datasets 010401 analytical chemistry 0104 chemical sciences Mercury (element) Reference values Saturation (chemistry) Combined uncertainty estimation |
| Zdroj: | TrAC Trends in Analytical Chemistry. 85:81-88 |
| ISSN: | 0165-9936 |
| DOI: | 10.1016/j.trac.2015.12.010 |
| Popis: | There is a need internationally for an agreement on reference values for the calibration of mercury vapour concentration measurements. These reference values are obtained from the relationship between Hg vapour mass concentrations at saturation in air (ɣHg, in ng cm−3) and temperature (T, in K). This relationship was re-evaluated by fitting replicated (n = 3,4) SI traceable measurement results obtained for mL size mercury-saturated air samples at temperatures of around 288.4, 293.3, 298.2 and 303.1 K (2.4%, 0.20%, 0.51% and 1.6% relative standard errors of the means, respectively). It gave ɣHg = C/T*10(−B/T) with B = 3282.92 K and C = 6.73257 × 1014 K ng cm−3, at an estimated relative expanded (combined) uncertainty of 5.9% (k = 2). The measurement procedure was based on temperature controlled automated sampling of the gaseous mercury, isotope dilution of the mercury following trapping into the liquid phase under closed circuit conditions, and inductively coupled plasma mass spectrometry for the signal acquisition. |
| Databáze: | OpenAIRE |
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