English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

. As direct real-time analysis techniques, selective ion flow tubemass spectrometry (SIFT-MS) and proton-transfer reaction mass spectrometry(PTR-MS) provide online measurement of volatile organic compounds (VOCs).Both techniques are widely used across several disciplines, e.g., atmosphericchemistry, food science, and medicine. However, the humidity of the sampledair greatly influences the quantified mixing ratio and must be accountedfor. Here we present several improvements to a Voice200ultra SIFT-MSinstrument to reduce background levels and enhance sensitivity. Increasingthe sample gas flow to 125 sccm enables limits of detection (LODs) at the sub-parts-per-billion (sub-ppb) level, and theresulting humidity dependence is overcome by calibrating for humidity aswell. A comparison with a PTR-QMS 500 showed detection limits of the PTR-MSstill being an order of magnitude lower, whereas sensitivity was higher forSIFT-MS, and its calibration was still more robust against humidity. Thus,SIFT-MS is a suitable, lower-cost, and easy-to-use alternative foratmospheric trace gas measurements of more complex mixtures, even withisomers, at a varying humidity range.

SIFT-MS optimization for atmospheric trace gas measurements at varying humidity