Potassium fluoride as a selective moisture trapping agent for SPE-TD-GC-FID determination of volatile organic compounds in air

Abstract

Anhydrous potassium fluoride has been proposed as a novel selective moisture trapping agent for gas chromatography to remove water vapor during adsorption concentration of low molecular weight volatile organic compounds (VOCs) from moist air.

Sensitivity Increase in Headspace Analysis of Hydrocarbons in Water by Using Online Selective Elimination of Gas Extractant

“…For example, popular desiccants such as CaCl 2 and Mg(ClO 4 ) 2 are not suitable, as they can retain lower alcohols and ketones together with steam [21]. Potentially, potassium fluoride, which is not soluble in polar organic solvents compared to ordinary dehydrators [22], might be used as a selective absorbent of water vapor. Hydrogen is widely used in gas chromatography (GC) in terms of its application with flame ionization detector (FID) and is readily absorbed by palladium, its alloys, and some other metals at room temperature [23].…”

A General, Multimetallic Cross-Ullmann Biheteroaryl Synthesis from Heteroaryl Halides and Heteroaryl Triflates

“…The initial reaction optimization using 6-methylpyridin-3-yl triflate ( 1a ) and 3-bromopyridine ( 2a ) as starting materials (Table and Table S6 in Supporting Information) revealed that nonsymmetric biheteroaryl 3a could be formed in 50% yield in the presence of 5 mol % NiBr 2 (dme)/ N1 and 5 mol % PdCl 2 / P1 as catalysts, 2 equiv of Zn as reductant, and 2 equiv of KF as additive in DMF at 60 °C (Table , entry 1). A series of control reactions confirmed the necessity of metal catalysts, reductant, and salt additive. , Replacement of the highly hygroscopic KF additive with KBr did not lead to any decrease in yield of 3a (entry 2). Further screening of the amine ligands on nickel showed that, while dtbbpy ( N1 ) remained the most promising for the model substrate pair, 1,10-phenanthroline ( N2 ) and substituted terpyridine ligands ( N3 and N4 ) were also relatively effective (entries 3–5).…”