Titrator for semi-micro volume analysis
A
Metrohm UK product story
Edited by the Laboratorytalk editorial team
Aug 17, 2001
The Eco Titrator from Metrohm requires only small sample sizes, and small volumes of reagents, and consequently has lower runing costs and produces less waste
The semi - micro titrator has a titration analysis stand that significantly reduces the sample size needed for analysis, the reagent volumes, waste volume and subsequently the running costs for the analysis by a factor of four.
This is particularly important in the case of Karl Fischer (moisture content ) analysis where reagent can be very expensive.
The dosing burette in the titrator works with such precision that reagent consumption of 3-4 ml is sufficient to determine the content of a sample with a relative standard deviation better than +/- 0.2 %Sample sizes as low as 25 micro litres are analysed using this method.
Homogeneous solid samples can be weighed directly on a semi micro balance with an accuracy of 0.01mg.
If an adequate balance is not available or the sample is inhomogeneous the recommended procedure is to produce a stock solution and take aliquots.
Microvalves in the titration system prevent diffusion of reagent at the burette tip and titration modes that wait for an equilibrium to be established gives highly accurate results, even under non-optimal conditions.
The electrodes recommended with the Eco Titrator are the Metrohm Titrodes which are a combined electrode eg, Pt or Ag that do not need a reference electrolyte.
This means that no diaphragm problems are encountered or interference caused by outflowing reference electrolyte.
Smaller Metro sensors also allow the scaling down of almost any titration and some of the combined 'long life' micro electrodes have been developed for the Eco Titrator.
Smaller volumes allow the use of higher purity solvents, which have lower blank values.
Thanks to the automatic aspiration and rinsing section of the titrator and the closed system, it means that when one is dealing with toxic or volatile solvents a fume cupboard is not necessary.
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