Re: spinning problems
RDUDLEY (rdudley@ARSERRC.Gov)
Fri, 07 Nov 1997 14:22:02 -0400 (EDT)
>
>This is a very useful discussion, we have problems of this nature as well.
>I am not sure that it is a finger grease problem only, we also have seen some
>other gunk of a brownish color. We could not identify the stuff by MS, but
>the MW is about 471 (as I recall), and it is not a lubricant.
Chloroform dissolves the NMR caps. We haved used only red caps for a number of
years on an old JEOL 400MHz spectrometer. The bore tube had a red ring around
it from where the chloroform dissolved a bit of the caps.
Bob Dudley