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Topic: method of analysis  (Read 8034 times)

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Offline lubnashraf

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method of analysis
« on: November 22, 2007, 04:38:50 AM »
 ??? i want to know the method of analysis of (purity and moisture content)ethyl acetate by titration method with all calculation?

secondly whats the mobile phase in GC analysis of pentaerythritol, or tell me method of  analysis of pentaerythritol?

thanful to all,

lubna
analytical student
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Offline AWK

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Re: method of analysis
« Reply #1 on: November 22, 2007, 04:45:34 AM »
Read forum rules
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Offline Nick.Sparrow

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Re: method of analysis
« Reply #2 on: November 22, 2007, 05:41:56 PM »
I think it is impossible to perform ethyl full acetate analysis by titration. At least you can use Fischer Moisture Analysis (Better to read about it more). Other impurities better to determine by GC.

The second question is funny, since in GC the mobile phase is an inert gas such as helium, and there is nothing to choose from  ;)
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Offline lubnashraf

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Re: method of analysis
« Reply #3 on: December 05, 2007, 03:28:35 AM »
Quote from: Nick.Sparrow on November 22, 2007, 05:41:56 PM
I think it is impossible to perform ethyl full acetate analysis by titration. At least you can use Fischer Moisture Analysis (Better to read about it more). Other impurities better to determine by GC.

The second question is funny, since in GC the mobile phase is an inert gas such as helium, and there is nothing to choose from  ;)

sorry in hurry i wrote GC uh, i want to know the mobile phase used in HPLC in pentaerythritol analysis?
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Offline sondakem

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Re: method of analysis
« Reply #4 on: December 10, 2007, 11:27:02 AM »
HPLC analysis of PE is made difficult because detectors are relatively insensitive to it - all except MS and a light scattering detector.  Even so, it can be done by reversed phase (C18 column and water/methanol mobile phase).  The exact composition of the mobile phase will vary from brand to brand of column.
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Offline mylkoa

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Re: method of analysis
« Reply #5 on: December 15, 2007, 11:40:38 PM »
Quote from: AWK on November 22, 2007, 04:45:34 AM
Read forum rules

Why did the moderator tell the poster to read the forum rules?

I just re-read the rules and didn't catch any mistakes... except maybe a broad topic title?

Thanks,
Andy
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Offline Borek

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Re: method of analysis
« Reply #6 on: December 16, 2007, 04:56:32 AM »
Quote from: mylkoa on December 15, 2007, 11:40:38 PM
I just re-read the rules and didn't catch any mistakes... except maybe a broad topic title?

You are required to show some effort.
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Offline mylkoa

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Re: method of analysis
« Reply #7 on: December 16, 2007, 04:08:06 PM »
Quote from: Borek on December 16, 2007, 04:56:32 AM
You are required to show some effort.

Hello,

I don't mean to be a pest, but what indicated a lack of effort to you?

Perhaps I don't see what you see because I am a beggining organic chemistry student...

Happy Holidays,
Andrew
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Offline Borek

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Re: method of analysis
« Reply #8 on: December 16, 2007, 05:25:56 PM »
Quote from: mylkoa on December 16, 2007, 04:08:06 PM
what indicated a lack of effort to you?

What indicates any effort here?
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