Hello.
A student here is measuring proton spectrum of very dilute samples in D2O.
He needs to be able to accurately integrate a small peak at around 3.5 ppm,
but there is a broad peak or hump located there.
We are unsure of the cause of this hump. We have tried looking at different
solvents, different samples, different sample tubes, and different
spectrometers, and the peak is visible in both D2O and CDCl3 spectra. It
doesn't appear to be present in acetone-d6 or DMSO spectra. The hump is
independent of spectrometer frequency, sweep width, and spinning.
I would appreciate any ideas of what this contaminant is, and (more
importantly) how to remove it.
Thanks!
Stephanie Mabry
--------------------------------------------
Stephanie Mabry, Ph.D., Instrument Manager
University of Maryland, Baltimore County
Dept. of Chemistry and Biochemistry
1000 Hilltop Circle
Baltimore, MD 21250
office (410)455-1031
fax (410)455-2608
mabry_at_umbc.edu
Received on Thu Oct 04 2001 - 11:14:06 MST