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Carbonate analysis
Posted: Mon Oct 29, 2007 11:50 pm
by chenjie
We have an ICS 3000 from Dionex, and we need to develop an analytical method to analyze carbonate in samples. Does anyone have any idea where to start? Does CO2 in air interfere the analysis?
Posted: Tue Oct 30, 2007 4:01 am
by duantech
You may go dionex website for more info (column, application notes, etc). And you need to know what anions are in a sample preparation.
Precautional measures (degas, reagent, helium protection) are recommended to eliminate interference from CO2 dissolved in aqeous solution.
best
duantech
Posted: Tue Oct 30, 2007 10:24 am
by chili
I analyze carbonate on IC-3000. It is no problem. You can only inject from each vial once, because air interferes. I use degassed MQ-water as mobile fase.
Posted: Tue Oct 30, 2007 10:26 am
by HW Mueller
duantech, you want to get rid of CO2 without touching CO3- in the same solution?
Posted: Tue Oct 30, 2007 3:25 pm
by duantech
Hi, HW Mueller,
What I meant is for diluent and mobile phase preparation, not for sample. There is no way you can remove CO3- by normal degasing procedure. I should've made it clear. Sorry.
best
duantech
Posted: Wed Oct 31, 2007 7:43 am
by HW Mueller
Depends on the pH, if "H2CO3" is present you will loose carbonate in a degassing process.
Posted: Thu Nov 01, 2007 10:55 am
by Markus Laeubli, Metrohm
We are using suppressed ion exclusion for this analysis in IC. See the respective
Application Note.
But to be honest, acid/base titration is the more simple method. And it even gets you more information like carbonate / hydrogen carbonate ration.