Sample Preparation - Chromium Oxidation State

 
Hello, I am analyzing a powder for % Cr. The sample is a very dark purple powder, I add HNO3 and HCl and let it sit for an hour to dissolve. I then bring it up to a final weight (final matrix is 2.5% HNO3, 5% HCl). When I am diluting to the final weight the sample is green, indicating Cr is in the 3+ oxidation state. My working and stock standard samples are orange (Cr 6+). Is this ok? I have heard Cr has slow kinetics, how do I know all the Cr is in solution and I will get accurate % Cr for my samples? Thank you,
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admin Total posts: 529

Thanks for answering.

Posted: 11/16/21 08:01:48
admin Total posts: 529

Thanks a  lot!

Posted: 10/29/21 07:01:37
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Posted: 09/14/21 03:43:23
Jamie King Total posts: 1

This whole oxidation process should be recorded by the live monitoring security services camera.

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Posted: 09/10/21 02:49:15

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