Na + K analysis low level

[t***@gmail.com]

Hi,

I'm looking a good way to analyse Na and K on 10 microg/l level. Does
any one have a good suggestions what method shoud I use. I don't have
an ICP on my disposal.

[David Stone]

In article

Post by t***@gmail.com
Hi,
I'm looking a good way to analyse Na and K on 10 microg/l level. Does
any one have a good suggestions what method shoud I use. I don't have
an ICP on my disposal.

Flame atomic emission might work for the sodium, depending on your
sample matrix; not sure about the lod for K by that technique, but
it ought to be feasible.

You might get away with ion chromatography, but I suspect it would
depend on how sensitive you can dial up your detector, and how
pure your running buffer is.

[Bob M]

Most sensitive method is flame emission but flame temperature must low
LPG/ air would probably be most suitable. High temperatures result in
greater ionisation and reduction of elemental material in flame.
Photometer sensitivity and traces in reagents are the largest factors
limiting sensitivity. I have a geriatric EEL (mid 1950s) still in use
it is certainly capable of what is required for sodium I have never
pushed the limits for potassium.

Bob M

[jose_gregorio_contreras]

Hi,
I use a strong cation resin procedure; I have tested with the flame emision
and teh resukts are the same.
First you elude the Na an titulate de H- and after that eluded the K.
The procedure is low but is good if you hava a low number of samples.
Or you can make the analysis in parelel.

[Marvin]

Post by jose_gregorio_contreras
Hi,
I use a strong cation resin procedure; I have tested with the flame emision
and teh resukts are the same.
First you elude the Na an titulate de H- and after that eluded the K.
The procedure is low but is good if you hava a low number of samples.
Or you can make the analysis in parelel.

In blood analysis by flame emission, sodium affects the
intensity at the wavelength of the K lines by increasing the
continuum background. For this reason, a separation
followed by flame emission is a more reliable procedure. If
the flame emission includes background correction, the
separation isn't important.

[jose_gregorio_contreras via NatScience.com]

The Mn has a line that interfer with the K too.

Post by Marvin

Post by jose_gregorio_contreras
Hi,
I use a strong cation resin procedure; I have tested with the flame emision
and teh resukts are the same.
First you elude the Na an titulate de H- and after that eluded the K.
The procedure is low but is good if you hava a low number of samples.
Or you can make the analysis in parelel.

In blood analysis by flame emission, sodium affects the
intensity at the wavelength of the K lines by increasing the
continuum background. For this reason, a separation
followed by flame emission is a more reliable procedure. If
the flame emission includes background correction, the
separation isn't important.

[r***@gmail.com]

Post by t***@gmail.com
Hi,
I'm looking a good way to analyse Na and K on 10 microg/l level. Does
any one have a good suggestions what method shoud I use. I don't have
an ICP on my disposal.

Hello Timo,

Please describe your matrix so that we may help you. Also, do you
need a minimum detection limit of 10 ppb? What instrumentation do you
have (AA, CE, IC, AE, XRF etc.).

David

[Samite Alchemist]

Post by r***@gmail.com
Hello Timo,
Please describe your matrix so that we may help you.  Also, do you
need a minimum detection limit of 10 ppb?  What instrumentation do you
have (AA, CE, IC, AE, XRF etc.).
David

Contamination issues at that level will be a killer. Na is
everywhere!

Samite Alchemist

[JJ]

Cation chromatography. Dionex is by far the industry leader. With
concentrating columns you can get unreal LODs.
It is that simple.

Post by t***@gmail.com
Hi,
I'm looking a good way to analyse Na and K on 10 microg/l level. Does
any one have a good suggestions what method shoud I use. I don't have
an ICP on my disposal.