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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: Cantacoxinha on April 01, 2019, 07:10:23 AM

Title: Isotope analysis
Post by: Cantacoxinha on April 01, 2019, 07:10:23 AM

Let's suppose you have a sample of pure LiAlH4 or LiAlD4 in the lab. Which analytical methods might be used to prove which of these two is in the bottle?

Title: Re: Isotope analysis
Post by: mjc123 on April 01, 2019, 07:26:57 AM

Infrared spectroscopy - Al-H and Al-D frequencies will be quite different.

Title: Re: Isotope analysis
Post by: Corribus on April 01, 2019, 11:34:04 AM

If you had no FTIR instrumentation, or didn't want to try to use such a reactive solid on it, I imagine you could also use the kinetic isotope effect to monitor a simple reaction rate. You would need a known sample as a control for comparison.

Title: Re: Isotope analysis
Post by: Babcock_Hall on April 01, 2019, 01:39:54 PM

Quote from: Cantacoxinha on April 01, 2019, 07:10:23 AM

Let's suppose you have a sample of pure LiAlH4 or LiAlD4 in the lab. Which analytical methods might be used to prove which of these two is in the bottle?

First, what are your thoughts?