Hello all. I am new to this forum. i have been using an Agilent 7500 and 7800 mass spec for years and recently purchased a Cary Eclipse.
The purpose of the Cary is to analyze low level (ppm and ppb levels) of uranium in our waste stream processes. We currently use our 7800 for this, but have an old ChemChek phosphorescence instrument we use as well. I replaced that with the Cary to opt for a better company, software and the use of fluorescence.
However, I am having issues with the application. I am not sure if it is something in the software or my prep that is incorrect. I tried complexing with NaF, and at different concentrations of a uranium standard i am getting lower than blank results and all concentrations are the same and negative. Its like it isn't fluorescencing and giving me nothing.
I found some literature where someone had fluorescence uranium by using phosphoric acid as a complexant. I tried that and had the same results as I did with the NaF.
I even tried the standards themselves with no complexant and it too was giving me nothing.
Any literature, or direction would be greatly appreciated.
Thanks in Advance