Gas chromatographic determination of admixtures of permanent gases, CO, CO2, and hydrocarbons in methylsilane

A recyclable polyoxometalate-based supramolecular chemosensor for efficient detection of carbon dioxide

“…For example, monitoring of dissolved CO 2 in arterial blood allows a timely clinical response in the case of patients with pneumonia or acute respiratory distress syndrome. 2 Nowadays, CO 2 detecting and sensing methods, including electrochemical systems, 3 near-infrared spectroscopic techniques, 4 gas chromatography 5 and optical chemosensors 6 are well-established. Among these, state-of-the-art Severinghaus-type electrochemical CO 2 sensors are widely used in commercial clinical blood gas analyzers, but these probes still suffer from a long response time and are only capable of detecting a relatively high CO 2 concentration, because their working performance relies on diffusion and the establishment of an equilibrium between the internal pH electrode and the sample.…”

Intra-molecular hydrogen bonding stabilization based-fluorescent chemosensor for CO 2 : Application to screen relative activities of CO 2 absorbents

“…After refluxing for 1 h, the resulting mixture was allowed to cool to ambient temperature. The precipitate was filtered and recrystallized from a water-ethanol mixture to give compound 4 as a pale yellow crystal 13 …”

“…Solubility of compound 4 was poor in various deuterated solvent (CDCl 3 , DMSO-d 6 , CD 3 OD, D 2 O), so the NMR spectrum of compound 4 was obtained from compound 4 HCl salt. mp 229 ~ 230 ⁰C; 1 H-NMR (300 MHz, DMSO-d 6 ) δ 8.80 (s, 1H), 8.60 (d, 2H, J = 9.7 Hz), 8.19 (d, 2H, J = 8.7 Hz), 7.74 ~ 7.59 (m, 4H), 5.29 (s, 2H), 4.17 (s, 2H) ppm 13. C-NMR(150 MHz, DMSO-d 6 ) δ 168.71, 131.31, 131.24, 130.32, 129.49, 127.44, 125.94, 124.88, 123.45, 47.85, 43.07 ppm.…”

Research on the minimum detection limit for measuring high-purity gases by gas chromatography

“…In various fields, including semiconductor, medical, aerospace, energy, and chemical industries, the demand for various industrial gases is increasing day by day, not only in terms of quantity but also quality, that is, the demand for high-purity gases is more and more [4,5] . The detection of trace impurities in gases is a key link in the production of high-purity gases and gases for the electronics industry, and the analysis of trace impurities in these gases has always been a difficult point for chromatographic analysis [6,7] .…”