Optimal acid concentration to run on ICP-OES

Hi all,

I am currently using the ICP-OES 5800 to run some microwave-digested samples. Since the sample digestion uses concentrated nitric acid, I would like to know what the maximum accepted %acid concentration is optimal to run in the ICP-OES? I usually use 1-5% nitric acid to prepare my standards, but the digested samples will need to be very diluted to reach 1% (which I may not see my analyte).

Thank you so much!

0 carwogill 1 day ago

Hi, I am not familiar with the ICP-OES equipment/technique, but I use 14% nitric acid solutions all the time with ICP-MS.

After digestion with nitric acid and dilution to 50 ml my sample solutions are 14%. With ICP-MS there are two Ni cones before the torch. Those can deteriorate after long exposure to acids. Therefore I use Pt coated cones.

I would assume ICP-OES can handle the same acid concentrations. After all. acid digestion is a common type of sample prep.
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