A simple solution for the water determination of difficult samples has samples introduced to the oven in their own tightly-sealed vials rather than in boats
Based on the Metrohm 774 automated oven processor, the new Metrohm 832 Thermoprep has been developed for single determinations.
The vial technique is applied, ie, the samples are no longer introduced into the oven by means of a sample boat, but in their own tightly-sealed vials.
Combined with the refined methodology of the compact KF Thermoprep this brings decisive advantages.
Various substances (eg, ascorbic acid) that undergo side reactions with KF reagents and or are not soluble in KF solvents can be analysed easily.
Strictly reproducible analysis conditions for all samples, this is shown by the considerably improved precision of the results.
Manual sample preparation is reduced to a minimum, just 'weigh, crimp and analyse'. Considerable savings in time and money, less reagent costs for example.
No contamination of the oven, consequently there is no carryover and memory effects.
Improved water release from the sample as the carrier gas does not just pass over the sample but directly through it.
Fast analysis times; typically three minutes.
Depending upon the samples water content, the analysis can be carried out volumetrically, for high levels, or coulometrically, for trace amounts.
The construction of the 832 Thermoprep oven is so flexible that it can be used for all vial sizes, both larger and smaller than the standard Metrohm vials.
