Does anyone have any ideas on what might give a phosphorus signal at negative 74 ppm (cf phosphoric acid)? There's a very small signal in many of my 31P spectra at -74 ppm. It's not a spectrometer artefact and it it present in samples prepared by different people on- and off-site using different tubes and different sources of solvents. The samples are chemically variable too, alkyl/aryl-phosphines in organic solvents, phosphates in water but there's this little curiousity at -74 ppm.
Thank-you.
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31P signal at negative 74 ppm
Linear Mode
