Product category:
Chromatography accessories
News Release from: Metrohm UK | Subject: MSM
Edited by the Laboratorytalk Editorial
Team on 23 April 2007
Sequential suppression improves
detection limits
The MCS removes any residual CO2 and thus provides 20 to 50% larger peak areas, an extremely low background conductivity and an excellent linearity of calibration
In ion chromatography (IC), suppression techniques are designed to improve the analytical performance where conductivity detection is normally used Depending on the application, electronic or chemical suppression techniques can be applied
This article was originally published on Laboratorytalk on 2 May 2007 at 8.00am (UK)
Related stories
MSM guarantees the lowest limits of determination
Notes on the determination of sulphate in denatured ethyl alcohol by direct-injection ion chromatography and sequential suppressed conductivity
While the first technique is appropriate for most cation analyses, the latter technique is preferentially used for anion analysis.
Chemical suppressors utilise cation exchange (packed-bed suppressor, MSM) to replace the metal cations accompanying the anions of interest by the more conductive hydronium ions.
Moreover, the cation exchange transforms highly conductive eluents (hydroxide or carbonate/hydrogen carbonate eluents) to non-dissociated and thus weakly conductive substances.
The reduced baseline conductivity and the enhanced conductivity of the analytes results in a significant improvement of the detection limits.
Yet another outstanding sensitivity enhancement in suppressed IC is achieved by the installation of the MCS CO2 Suppressor between the MSM and the conductivity detector.
Moreover, the interfering injection and system peaks are largely eliminated. Request a free brochure from Metrohm UK ...
• Metrohm UK: contact details and other news
• Email this article to a colleague
• Register for the free Laboratorytalk email newsletter
• Laboratorytalk Home Page
Search the Pro-Talk network of sites
