Measurement and Results - Internal standard 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 do not get along. Do you have any advice on other possible internal standards that work fine in a variety of pH?
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Since you are using Y already it would be a shame to switch (and it's generally not a good idea unless absolutely necessary). 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. If your pH is in the 7-11 range this may be worth a try. If your pH can go up to as high as 12 to 13 then DTPA will keep the Y in solution (diethylenetriaminepentaacetic acid). |