Geräteausstattung Chromatographie Bild oben (3)


Proficiency tests

Within the framework of the external quality assurance according to DIN EN ISO/IEC 17025 we examine the result and the competence of accredited and non-accredited measurement methods through regular proficiency tests and laboratory comparison measurements.

We have passed the following external aptitude test in the past 3 years without any errors (z-score < 2) above the determination limit:


  • r-concept: E-1617 (As, Pb, Cd, Cr, Fe, Cu, Mn, Ni, Hg and Zn in water and wastewater)
  • nanoAnalytics: laboratory comparison EDX 2016 (O; Si; Na; Ca; Mg)
  • IFA of DGUV: aldehydes with sample collection 25./26. October 2016; formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde


  • NLGA Aurich: chemical testing of drinking water 4-2017: Al, NH4, Fe, electrical conductivity (25°C), Cu, Mn, NO3-, NO2-, pH-value and turbidity
  • IFA TULLN: LHKW in water; 13 various chlorine and bromine alkanes, and chlorine alkenes
  • CEC: comparative test number 162 for particulate measurement systems according to VDA 19 part 1
  • DRRR: RVEP 170042 Identifikation von Kunststoffgranulat mittels FTIR-Spekroskopie; EVOH, PA, PE, PBT, ABS und PMMA
  • CEC: Vergleichsprüfung Nr. 171 für partikuläre Messsysteme nach VDA 19 Teil 1
  • Participation AGÖF – laboratory comparison measurement: „house dust – sharing of real samples („Hausstaub – Austausch realer Proben“)


  • r-concept: NaCL-1805; electrical conductivity, pH-value, Na, K, Mg, Ca, chromium (VI), chloride and sulphate
  • nanoAnalytics: laboratory comparison EDX 2018 intermetallic phase; Ni, Y and Si
  • r-concept: E-1817-a in water and wastewater; As, Pb, Cd, Cr, Fe, Cu, Mn, Ni, Hg and Zn