Measurement of pH by NMR Spectroscopy in Concentrated Aqueous Fluoride Buffers.

ABSTRACT: An NMR spectroscopic technique has been developed to give rapid, accurate pH measurements on tenth-milliliter samples of concentrated acidic aqueous solutions buffered by fluoride ion in the pH 1.5 - 4.5 range. The fluoride (19)F chemical shift has been calibrated as a function of pH at 0.1 and 1.0 M concentration by reference to an internal 3-fluoropyridine standard. Subsequent measurements of fluoride buffer pH required no additives and only two NMR spectra in the presence of an external reference standard.

SUBMITTER: Gerken JB 

PROVIDER: S-EPMC3029024 | biostudies-literature | 2011 Jan

REPOSITORIES: biostudies-literature