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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: amitsachdeva on January 24, 2005, 11:52:11 PM

Title: Free Radical detection by wet chemistry??!!
Post by: amitsachdeva on January 24, 2005, 11:52:11 PM

I am desperately trying to detect the presence of free radicals (produced by Benzoyl Peroxide) in a solvent. I am looking for an indicator that can detect the presence of free radical species and not the presence of Benzoyl Peroxide itself. Being a preliminary investigation, I don't want to use anything but wet chemistry. I will be glad if I can get any suggestions. Thank you.

Title: Re:Free Radical detection by wet chemistry??!!
Post by: Mitch on January 25, 2005, 12:04:32 AM

okay, you should read the organic literature, I'm sure this has been done many times before.

I have a crazy idea that you could use cyclohexadiene and monitor the UV-Vis absorbance over time, but I haven't looked this up and you should read-up on radical indicators.

Title: Re:Free Radical detection by wet chemistry??!!
Post by: amitsachdeva on January 25, 2005, 12:44:59 AM

Thanks for the reply. Is there a direct method that I can use instead of using any kind of sophisticated techniques? At this level, I just want to use pure wet chemistry methods. Thanks.

Title: Re:Free Radical detection by wet chemistry??!!
Post by: Donaldson Tan on January 25, 2005, 05:23:57 AM

how about using iodine to trap free radicals?

Title: Re:Free Radical detection by wet chemistry??!!
Post by: amitsachdeva on January 25, 2005, 09:54:58 AM

I found a reference to an article that describes the use of Iodine to detect the presence of peroxides. I wonder if it will show a different color after the dissociation of Benzoyl Peroxide. Dichlorofluorescin is an indicator used detecting free radicals in the medical industry.