At 12:23 PM 19/06/98 -0500, you wrote:
>I don't know about ideas, but I have two questions:
> 1. It's so basic I hesitate to ask, but so important I must. Do you
>perform the Hg profile each day before analyzing samples? If you don't,
>a small shift will eat your lunch.
Yes we do a mercury recalibration at the commencement of the run and during
the run at two-hourly intervals. As mentioned the spectra, when examined in
detail, overlap perfectly so there has been no spectral shift, and
reprocessing without MSF gives the expected result.
> 2. Are you also doing IEC's? Zn (in particular 213) has some
>coincidental emission spectra that cannot be corrected by MSF alone (Fe
>an Ni I believe). There are several other IEC's that still must be done
>in addition to the MSF, but substantially fewer than the traditional
I may be optimistic, but I believe that the spectral profiles for Fe and Cu
on Zn213 are resolved sufficiently to the degree that the overall spectra
can be managed by MSF, certainly we find with Zn that contamination in
single element solutions and blanks are dificult to avoid. Zn 206 is
relatively free of direct overlaps but also displays the apparent drift.
Thanks for the input
Are any PE boffins out there with ideas???