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Quantitation of sodium ion in water
Posted: Mon Nov 28, 2011 12:58 pm
by cody84
Is this feasible with a PDA? I found a crown ether with a chromophore attached at Sigma. It's quite expensive though.
Has anyone done HPLC for sodium ions before??
Re: Quantitation of sodium ion in water
Posted: Mon Nov 28, 2011 1:41 pm
by lmh
flame photometry?
Re: Quantitation of sodium ion in water
Posted: Mon Nov 28, 2011 3:38 pm
by krickos
Hi
With ELSD perhaps :
http://www.sequant.com/files/documents/ ... ations.pdf
nothing we use, use AAS or flame for identity or quantification in water solutions.
Re: Quantitation of sodium ion in water
Posted: Mon Nov 28, 2011 5:11 pm
by cody84
I only have access to a PDA detector
Was hoping there is some derivitization or something I could do to add a chromophore.
Re: Quantitation of sodium ion in water
Posted: Mon Nov 28, 2011 8:41 pm
by tom jupille
In principle, you could do it using ion exchange or ion pair chromatography with a UV-absorbing cation.
In practice, you can get an ion-selective electrode to hook up to your pH meter (you *do* have a pH meter, right?) for about $500. Unless there are interferences or you are looking at *very* low levels, using an HPLC for sodium would be like using a chain saw to prune your houseplants.
Re: Quantitation of sodium ion in water
Posted: Mon Nov 28, 2011 8:57 pm
by cody84
Hahahaha I know, I'm just looking into what I was asked, even though we have an AA and plenty of pH meters...
It's for ppb - ppm levels. I think I've convinced them its a waste of my time...hopefully.
Re: Quantitation of sodium ion in water
Posted: Tue Nov 29, 2011 4:13 pm
by Markus Laeubli, Metrohm
Dear cody84
IC with conductivity detection would be a perfect solution. But as you only have access to a PDA that does not really help.