We have observed a strange phenomenon using the Optima 3000 and MSF
Fistly let me qualify that I believe MSF is the best inter-element
interference correction method bar none, however...
We run a multi element QC control sample for drift monitoring, and
recallibrate if the QC falls outside set tolerance limits.
We read three lines for Zinc, 206, 213 and 334nm
On occasion we note that the Zinc in the control falls outside tollerance
on the 206 and 213 lines but not the 334 line.
It is usually low by a hefty 20 to 30% but the other elements in the QC
control are not affected.
The strange thing is that when we examine the spectra for the abberrant QC
sample vs an acceptable control sample they overlap almost perfectly on
both lines. Intensity data are closely comparable. If we reprocess the data
without MSF then the QC standards give acceptable data.
We are using Winlab V1.2 and have been using the Optima with MSF
successfully for two years. Two instruments are set up with identical
calibrations and MSF models, this happens only on one instrument, and has
been a feature of this instrument for its lifetime, the MSF model has been
re-built from scratch several times.