Metrohm combines conductivity and pH measurement with Inline Dilution and subsequent ion chromatography (IC)
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20.07.2011, 14:52
Metrohm combines conductivity and pH measurement with Inline Dilution
and subsequent ion chromatography (IC)
Metrohm is pleased to present a system that is able to calculate any
required dilution factor for IC from the conductivity of the sample
solution. In combination with Metrohm Inline Dilution (MIDT), this
system makes sure that the ionic concentration of the solution is ideal
for the subsequent analysis by IC. Moreover, by including inline pH
measurement in this procedure, Metrohm enables users to determine the
most important parameters in water analysis on a single system.
Excessive ionic concentrations are a challenge in ion chromatography as
they are likely to stress the column leading to incorrect results. To
prevent this, solutions are usually diluted prior to injection in the
ion chromatograph. The conductivity of the solution is usually taken as a
measure to determine the optimum dilution factor. However, conductivity
measurement and the dilution itself are still very often performed
manually – something that is both laborious and time-consuming.
The Metrohm technique presented here combines all of these steps in a
single system. To this end, sample is transferred into the measuring
cell equipped with a 5-ring electrode of an 856 Conductivity Module by
means of an 858 Professional Sample Processor and an 800 Dosino. From
the measured conductivity the software calculates the required dilution
factor. Subsequently, the sample is transferred to an external vessel,
exactly diluted there and then injected in the ion chromatograph for
analysis.
Apart from the conductivity, the pH value is determined in almost any
water analysis. The Metrohm system presented here enable users to simply
determine the pH value in the original solution by including an 867 pH
module in the system setup. As there is no manual work required the pH
measurement is fast. Alternatively, the pH value can also be determined
in the solution after it has been diluted. The pH measurement is carried
out to protect the column as there are some columns with only a limited
pH working range. This means that sample will only get injected in the
ion chromatograph, if the pH value is within the pH working range of the
column.
Ultimately, the MagIC Net™ software of the 850 Professional IC presents
the results of the conductivity and pH measurement together with the
results of the ion chromatographic analysis in a detailed report.
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