Method for Pd, Rh, Cu, and Li

We are currently developing a method for Pd, Rh, Cu, and Li. We have previously used an yttrium internal standard, but have been receiving samples with a residual basic pH that has caused problems with our runs, ending with the exclusion of the internal standard yttrium. I then saw on this site that yttrium and basicity to not get along. Do you have any advice on other possible internal standards that work fine in a variety of pH?

Since you are using Y already it would be a shame to switch. If you could complex the Y with EDTA i.e. add EDTA to your final solution then it will hold Y in solution at PH values up to 11.0. If your pH is in the 7-11 range this may be worth a try. If you pH can go up to as high as 12.5 to 13 then DTPA will keep the Y in solution (diethylenetriaminepentaacetic acid). It is not a good idea to switch internal standards unless absolutely necessary.

Serving you in chemistry,

Paul R. Gaines, Ph.D.
CEO of Inorganic Ventures & Fellow Chemist

DISCLAIMER: Advice offered by the chemists at Inorganic Ventures is intended for the individual posing the question. Feel free to contact us to verify whether these suggestions apply to your unique circumstances.