Quantitation of sodium ion in water

[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??

[lmh]

flame photometry?

[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.

[cody84]

I only have access to a PDA detector
Was hoping there is some derivitization or something I could do to add a chromophore.

[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.

[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.

[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.