Samples are often not useable for a direct analysis in their present form. Depending on the requirements we have various techniques for the preparation of the analyte available. In addition to the following standard work also complex sample preparations can be provided on request.

Preparation of homogeneous samples and subsamples

Our routine work includes the homogenization or pulverization of various solid matrices. This step has a significant influence on the quality of the analysis. Only by choosing suitable materials, grinding tools and parameters a homogeneity without disturbing contamination can be achieved. For this purpose we have sets of different materials as well as several grinding systems available (from mini-vibrating-grinder for a few mg of sample material to mortar-, disc-, ball- and planetary-mills to jaw crushers for large sample quantities). Sample dividers are used for the production of representative subsamples.


The samples, that we process, are often in such small quantities available that only a single analysis is possible. An extremely precise weighing is therefore necessary. For handling the smallest sample quantities ultra-microbalances with a resolution of 0.1 µg (microgram) are available.

Digestion methods

A decisive influence on the quality of the analysis has the choice of an applicable digestion method.

Precipitation or interfering matrix effects can only be considered upon front and stable compounds can only be digested completely by the use of suitable procedures. To avoid contaminations by reagents during the digestion, we only work with acids in subboiled-quality depending on the matrix.

Our digestion methods and systems include:

  • Pressure digestion in quartz-, PTFE- and PFA-vessels
  • Microwave digestion
  • HPA – high pressure digestion in quartz vessels
  • Bomb tube digestion
  • Digestion by Fusion
  • Acido-Rapid

Further preparative steps

Depending on the task and requested analytics the sample preparation may include additional steps. Regularly performed working-steps include:

  • Handling of air-sensitive samples under inert gas
  • Drying with the determination of the loss of drying
  • Extractions
  • Grinding, sawing and drilling as well as pickling and degreasing (for metal analysis)
  • Sample storage (e.g. under inert gas or in freezers)
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