Operating TOPwave
32
23 Water DIN EN 1189, ISO 6878
24 Water Aqua Regia
25 Water EPA 3015
NOTICE
Program 5 evaporation is used for evaporation of acid solutions only! Ti
mes may be
T must be set to <20°C.
6.1.4 Developing new Applications
Digestion of new sample material, that is, of samples for which you have no previous ex-
perience, requires a special, systematic procedure. We recommend the following process
when developing such an application:
Check for the questionable ancillary sample or similar substances whether a work in-
struction or an application document at the Analytik Jena is available (see section
"Applications" p. 76).
Should you not be able to find your sample material, search through the relevant
technical literature for a corresponding process instructions.
For safety reasons first reduce the specified weight of the samples by 30-50 % (in
terms of the maximum permissible sample weight for the type of vessel) while how-
ever using the stated quantity of acid and digesting with the temperature program
indicated.
Optimize the acid mixture and the temperature profile until you obtain a clear solu-
tion.
In the final step you can gradually increase the sample amount until the higher pres-
sure causes the rupture disc to activate. The maximum sample quantity to be used
should be approx. 30 % of this amount. If the pressure control system is installed the
maximum sample quantity may also be estimated from the measured pressures in
the digestion vessels.
For unknown sample material (e.g. for method development), you should only digest in-
dividual samples. Use at least two vessels and observe the minimum filling quantity.
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