What you say means NO reliable measurements can be made. Take please a look at the Web for *Ni isotope measurements*. Inductively coupled mass spectrometry is very performant, even the small variations in natural abundance of the Ni isotopes can be measured and evaluated. If you wish I can found you an analytical lab relatively near to Atlanta and you could ask them about precision and price both for Ni and Cu. I can ask at my former workplace- however they have worked mainly with lighter elements/isotopes. Peter
On Fri, Apr 15, 2011 at 4:48 PM, Jed Rothwell <jedrothw...@gmail.com> wrote: > Peter Gluck <peter.gl...@gmail.com> wrote: > > The simplest explanation of this contradiction is that "they" do not want >> to tell what the isotopic ratio of Cu is > > > No, the simplest explanation is that they are having difficulty doing mass > spectroscopy, and they keep getting conflicting results. Many people do, > even experienced researchers at major universities. > > Mizuno used to send a sample to three different groups of experts and get > three different answers. With some samples, that is. It depends on the > element, the extent of the shift, and the type of spectrometer. Some shifts > are large and easily detected. > > - Jed > > -- Dr. Peter Gluck Cluj, Romania http://egooutpeters.blogspot.com
