The importance of cylinder passivation for preparation and long-term stability of multicomponent monoterpene primary reference materials
<p>Monoterpenes play an important role in atmospheric chemistry due to their large anthropogenic and biogenic emission sources and high chemical reactivity. As a consequence, measurements are required to assess how changes in emissions of monoterpenes impact air quality. Accurate and comparabl...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-12-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://www.atmos-meas-tech.net/11/6429/2018/amt-11-6429-2018.pdf |
| Summary: | <p>Monoterpenes play an important role in atmospheric chemistry due
to their large anthropogenic and biogenic emission sources and high chemical
reactivity. As a consequence, measurements are required to assess how changes
in emissions of monoterpenes impact air quality. Accurate and comparable
measurements of monoterpenes in indoor and outdoor environments require
gaseous primary reference materials (PRMs) that are traceable to the
international system of units (SI). PRMs of monoterpenes are challenging to
produce due to the high chemical reactivity and low vapour pressures of
monoterpenes and also their propensity to convert into other compounds,
including other terpenes. In this paper, the long-term stability of
gravimetrically prepared static monoterpene PRMs produced in differently
passivated cylinders, including sampling canisters, was assessed. We
demonstrate that static PRMs of multiple monoterpenes can be prepared and
used as a suitable long-term standard. For the first time the effect of
cylinder pressure and decanting from one cylinder to another on the chemical
composition and amount fraction of monoterpenes was also studied.
Gravimetrically prepared PRMs of limonene in high pressure cylinders were
compared to a novel portable dynamic reference gas generator based on
dilution of pure limonene vapour emitted from a permeation tube.</p> |
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| ISSN: | 1867-1381 1867-8548 |