Analysis of perfluorocarboxylic acids in air.

Perfluorocarboxylic acids have been used in limited but important applications, such as in the production of fluoroelastomers and as components of fire-fighting foams. A method for the measurement of perfluorocarboxylic acids of different chain lengths in air is presented. Chain lengths tested included those having 8, 9, 10, 11, and 13 carbon atoms.

Method for trace level analysis of C8, C9, C10, C11, and C13 perfluorocarbon carboxylic acids in water.

A method was developed for the trace level analysis of pentadecafluorooctanoic acid (C8), heptadecafluorononanoic acid (C9), nonadecafluorodecanoic acid (C10), heneicosafluoroundecanoic acid (C11) and pentacosafluorotridecanoic acid (C13) in water. Samples were concentrated by solid-phase extraction (SPE) before analysis by combined liquid chromatography/electrospray tandem mass spectrometry (LC/MS/MS). A surrogate standard, 9-hydrohexadecafluorononanoic acid (9H), was used to monitor recovery.