Elemental analysis



>> click here to subscribe <<


Fabian Töpfer
NC 2/74
Fon +49(0)234 32 - 28378

Maurice Paaßen
NC 2/74
Fon: +49(0)234 32 -28378

sample pick up and return NC 2/28

Please note the measuring conditions

In  the  future  we are  going  to measure at least two samples  for one  determination. One  of the  samples  is used  for conditioning the device.

  • Order  forms  won’t  be  printed out anymore. On the homepage of the elemental analysis department, there is an order form(Excel), which has to be filled out correctly and comprehensively before sending it to our new mail address elementaranalytik[ät]
  • Save the filled-out order formas “Sample chiffre + consecutive No. “, i.e. FT-123-1.
  • The form contains three work sheets:
          Info –Fill-in help for the form
          Input mask–Contains fields to write down all relevant data
          Formular–Printable version, containing the input masks content

The results will be noted on that form before sent back.

  • Please pay attention to only use the latest version of the order form. The version and date of change is presented in the top right corner of the actual form
  • One order form, even for the conditioning sample, must be submitted. A n-fold determination consists of n+1 samples and n+1 order forms.
  • The next measuring date will be announced as soon as there are enough measurements for a day. Sample material can be delivered right after sending the form, but has to be in room NC 2/28 until 12.00 o’clock at the measuring date.
  • Spare sample material has to be picked up the day after the results were sent.
  • For self-weighing please pay attention to the following criteria:
         After typing the formula into the form, please take note that it is demanding to stay inside the weighing-range.
         The deviation of the Net weight must be ≤ 15%.
  • If one or more criteria aren’t met we try to request another, valid sample. Otherwise the sample will be postponed.

Implementation of the form into the ELN is initiated. Questions or suggestions via Mail to Fabian.Toepfer[ät]

The costs for the use of the elementary analysis service are based on the following table:
A three-user distinction is used which leads to the different estimation of personnel costs and overhead. The work is always done by the staff of the Elemental Analysis Department. The estimated overhead is based on the specifications of the Ruhr University Bochum.

charges per sample in 2022
determination type internal user external user (RUB) non-RUB users
simple determination 13,22 € 34,68 € 72,34 €
double determination 19,83 € 52,02 € 108,51 €
multiple determination (n+1)·6,61 € (n+1)·17,34 € (n+1)·36,17 €

Notes: Users and calculated costs:

  • internal users = members of the Faculty of Chemistry and Biochemistry of the RUB Usage
    costs = 10% personnel costs + usage/wear costs
  • external users = members of other RUB faculties usage
    costs = 100% personnel costs + usage/wear costs
  • non-RUB users = non-members of the RUB Usage
    costs = 100% personnel costs + usage/wear costs + ancillary labour costs + VAT

user regulations


  • 120 samples up to 300 mg can be loaded into the integrated autosampler.  


  • In a first zone, a permanent combustion or pyrolysis temperature of up to 1200°C is the prerequisite for accurate S or O determination.
  • For special applications, e.g. in IRMS analysis, even 1400°C are applicable.
  • In a 2nd zone, NOx is reduced to N2 by heated copper. The user can choose between small or large tube diameters, depending on the sample volume.  


  • N2 is transferred by the helium carrier gas stream to the detector, while CO2, H2O and SO2 are adsorbed on a column. By heating the column step by step, "temperature programmed desorption" (TPD) of the gases takes place and complete separation is achieved even with large differences in concentration (patent pending).