The 808 Titrando from Metrohm can be used as an ECO titrator that requires only small sample sizes and small volumes of reagents.
The semi-micro titrator has a titration-analysis stand that significantly reduces the sample size needed for analysis, as well as the reagent volumes, waste volume and subsequently the running costs for the analysis by a factor of four.
The dosing burette in the titrator works with such precision that reagent consumption of 3-4ml is sufficient to determine the content of a sample with a relative standard deviation better than +/-0.2 per cent.
Sample sizes as low as 25 microlitres 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 non-homogeneous, 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 give highly accurate results, even under non-optimal conditions.
The electrodes recommended with the Eco Titrator are the Metrohm Titrodes, which are a combined electrode.
This means that no diaphragm problems are encountered or interference caused by outflowing reference electrolyte.
Smaller Metro sensors 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.
Due to the automatic aspiration and rinsing section of the titrator and the closed system, a fume cupboard is not necessary when dealing with toxic or volatile solvents.
