Stabilized gravimetric standard for sulfites and sulfur dioxide

Interferences from aldehydes and peroxyacetyl nitrate when sampling urban air organic acids on alkaline traps

“…In fact, Irgum (31) reported that formaldehyde at concentrations of up to 0.05 M is stable in 0.5 N aqueous sodium hydroxide. When ambient air is sampled with alkaline traps, the sampling conditions, including low (ppb) aldehyde concentrations, low water content of the trap, and short contact time between the sampled air and the alkaline substrate, are not favorable to aldehyde disproportionation.…”

Polymeric ISE for Hydrogen Sulfite Based on Bis‐Urea Calix[4]diquinones as Neutral Lipophilic Ionophores

“…) include titration [1], gravimetry [2], spectrophotometry [3 ± 9], chromatography [10 ± 12], and electrochemistry [13 ± 19]. Among them, it was known that potentiometric analysis by ISE is simple, rapid, and less expensive.…”