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Topic: Digestion of MnIrCr  (Read 885 times)

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Offline Ithakaz

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Digestion of MnIrCr
« on: November 07, 2018, 12:20:09 PM »
Hello!

Does anyone have any suggestions on getting some MnIrCr alloy into solution for ICP-OES analysis? Its around 49% Mn, 48% Ir and 3 % Cr

Obviously the issue is the Iridium, I've tried just nitric/water, aqua regia, and adding HF, but nothing seems to be working.

Offline wildfyr

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Re: Digestion of MnIrCr
« Reply #1 on: November 07, 2018, 03:42:59 PM »
Holy cow, I never realized quite how unreactive iridium is. This fun paper (https://www.jim.or.jp/journal/e/pdf3/52/11/2067.pdf) and wikipedia basically say there aren't room temp conventional wet processes for dissolving it.

What about using electrochemical methods to dissolve it?

Offline Ithakaz

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Re: Digestion of MnIrCr
« Reply #2 on: November 07, 2018, 04:23:03 PM »
Right? I came across that paper as well, didn't seem to encouraging, haha.

What confuses me is that our Standard Solution from SCP is 1000ppm Iridium, and it says its just in 10% HCl.

Offline Borek

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Re: Digestion of MnIrCr
« Reply #3 on: November 07, 2018, 05:57:02 PM »
What confuses me is that our Standard Solution from SCP is 1000ppm Iridium, and it says its just in 10% HCl.

Aren't you mistaking kinetics with thermodynamics? Just because it is very difficult to dissolve doesn't mean it can't be stable in the solution.
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