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Natural Science Forum / Chemistry / Analytical Chemistry / July 2008Na + K analysis low level
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. In article <9210a27a-8066-4961-82eb-3ab340603d48@d1g2000hsg.googlegroups.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. 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 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. > 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. The Mn has a line that interfer with the K too. >> Hi, >> I use a strong cation resin procedure; I have tested with the flame emision [quoted text clipped - 9 lines] >the flame emission includes background correction, the >separation isn't important. On Jul 14, 3:58 am, timo.mamm...@gmail.com wrote: > 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 > Hello Timo, > [quoted text clipped - 3 lines] > > David Contamination issues at that level will be a killer. Na is everywhere! Samite Alchemist |
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