I´ve a large amount of chromium when measuring any kind of samples (deionized water, blank solutions from the company...). I would like to know if it is due to a lack of cleanliness (especially of the cones) or it may be due to something else.
What isotope do you detect? A complex consisting of ArC could be a source for interferences mainly on mass 52...
Dear Ana,
You can minimize the residual carbon in the sample by emploing acid digestion in microwave closed system. In relation to ICP-MS instrumentation you can inject, if posible, colision (He) or reaction gases (H2 or NH3) in order to minimize the polyatomic interferences by Ar, C, S and Cl cluster. If I were you I will employ internal standardization with 5 micrograms of Sc in order to determine Cr by ICP-MS. I send you an article of mine. Good job. Best Regards
Article Performance evaluation of collision-reaction interface and i...
Thank you very much!
We have tested the sample using a KED system (kinetic energy discrimination) and almost all the inteference have dissapeared. There is only some Mg that we think that could be C2+. We would look for others methods to try to minimize it. Anyway, thank you very much for your answers!!
Hi there, I have some experience with interferences when measuring chromium, I usually do speciation, but newer the less this publication might help. If you are performing HPLC, there might also be some interferences coming from your eluting solution (like chlorine interference). Depends also which isotopes you are measuring. Probably best to measure all 4 and use correction equation on mass 54 for interfering elements such as 54Fe
http://pubs.rsc.org/en/Content/ArticleLanding/2012/JA/c2ja10270f#!divAbstract
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