Li 670.783 by 5900 ICP-OES

For Li 670nm, it should not make any difference between SVDV and radial only, because in SVDV Li is being measured radially as well.   I would examine my calibration curve fit. Are you using weighted fit? through blank? 

The calibration is linear with weighted fit and force through blank.  Also, the sensitivity is about 10X greater in SVDV than in radial.  Why is that?

The calibration is linear with weighted fit and force through blank.  Also, the sensitivity is about 10X greater in SVDV than in radial.  Why is that?

I would try it without weighted fit and without forcing through the blank because you are calibrating up to 50ppm. I'm sorry but I cannot be more specific on how the DSC works for SVDV mode in this forum. Consult your local applications engineer support person or sales person.

I would also check what viewing height you are using in radial mode and change the viewing height in your SVDV condition to that same viewing height

Thanks.  It worked great without weighted fit.

Do you know why the wavelength calibration is failing for K in radial mode?  I am using the Agilent Wavelength Calibration Solution that came with the instrument.  I have also tried using a single analyte K solution with the same concentration.  Is this indicative of any problems with my instrument?

Which viewing mode should I perform the wavelength calibration in?  I am using SVDV for analysis.

Thanks.

Although you have an SVDV instrument, you can perform the wavelength calibration in either axial or radial mode. If it is passing in axial mode, I don't think there is anything wrong with your instrument. I would recommend the following: perform a dark current with the plasma off. Then turn on the plasma and let it warm up for 20 minutes. Then perform a wavelength calibration in axial mode, then in radial. If it is still failing for K in radial mode, you could try cleaning the radial pre-optic window and using the default sample intro system: Seaspray nebulizer and double-pass spray chamber.