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Topic: Which method can quantitative analysis 1,3-Dibromo-5,5-dimethylhydantoin?  (Read 6080 times)

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Offline plain

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Which method can quantitative analysis 1,3-Dibromo-5,5-dimethylhydantoin?
« on: May 26, 2006, 04:41:45 AM »
I can't find a method which can apply to quantitative analysis 1,3-Dibromo-5,5-dimethylhydantoin, please help me.Thanks!
« Last Edit: May 26, 2006, 11:09:14 PM by plain »
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Offline dls

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Re: Which method can quantitative analysis 1,3-Dibromo-5,5-dimethylhydantoin?
« Reply #1 on: August 27, 2006, 06:19:13 AM »
Quote from: plain on May 26, 2006, 04:41:45 AM
I can't find a method which can apply to quantitative analysis 1,3-Dibromo-5,5-dimethylhydantoin, please help me.Thanks!

The bromine is considered active and has a formal charge of +1.  Analysis is by adding KI and simple thiosulfate reaction with starch indicator.  Remember there will be 4I- used for each DBDMH molecule
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Offline Hispania

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Re: Which method can quantitative analysis 1,3-Dibromo-5,5-dimethylhydantoin?
« Reply #2 on: September 04, 2006, 04:06:49 PM »
How about HPLC?
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Offline dls

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Re: Which method can quantitative analysis 1,3-Dibromo-5,5-dimethylhydantoin?
« Reply #3 on: September 05, 2006, 06:56:09 AM »
Quote from: Hispania on September 04, 2006, 04:06:49 PM
How about HPLC?

I have tried RP-HPLC on these kinds of molecules.  The active bromine oxidizes organics and causes all kinds of extra peaks.  Also,the DBDMH in any aqueous solvent will be in equilibrium with BrO-, mono BrDMH and DMH itself.  The whole mess is not good for quantitation
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