METROHM vario 940 - Sulfite and sulfate det.

Discussions about IC and related topics

5 posts Page 1 of 1
Dear all,

Have you got any experience with determination SULFATE and SULFITE in sample from technologycal waters. I can use for this app. METROHM vario 940 with SeS suppresion. Can I use Metrosep A Supp 10 250/4 for this app? Have you got experience with standard stability ? eg Will not it decompose SO3 to SO4 during calibration ?


Thank you
BR

Sam
Hello,

In order to separate and to make sure there is no decomposition you need to add about 1-2.5% acetone to your eluent. Also ASUPP 7 250 is the recommended column for this analysis.

-Doug Castrillo
dcastrillo@metrohmusa.com
Metrosep A Supp 10 also works.
The best stabilization of sulfite is adding 10 mmol/L formaldehyde to the sample /Diluent. Also 2% isopropanol showed to work.
Dr. Markus Laeubli
Manager Marketing Support IC
(retired)
Metrohm AG
9101 Herisau
Switzerland
Thank you,

I found IC-standard from Fluka (Sigma - Aldrich), 1000 μg/mL in 1% NaOH, do you have any experience with standard ?

Thank you
This standard is stable as it is. For dilution I would recommend to use one of the above mentioned stabilization methods. These dilutions should be renewed quite frequently.
Dr. Markus Laeubli
Manager Marketing Support IC
(retired)
Metrohm AG
9101 Herisau
Switzerland
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