Accreditation and Quality Assurance

, Volume 9, Issue 1–2, pp 82–89 | Cite as

Evaluation of the long-term performance of water-analyzing laboratories

  • Wolfgang KandlerEmail author
  • Rainer Schuhmacher
  • Susanne Roch
  • Patricia Schubert-Ullrich
  • Rudolf Krska
Practitioner’s Report


After 7 years of successful operation, the database of the proficiency testing (PT) scheme for water analysis organized by the Institute for Agrobiotechnology (IFA), Tulln contains nearly 4,000 data sets from over 300 interlaboratory comparison samples. About 70 analytical parameters (major ions, metals, trace ions, herbicides, volatile halogenated hydrocarbons, organochlorine pesticides and polycyclic aromatic hydrocarbons) were covered by the PT scheme. The data were evaluated using robust statistics in order to determine a set of coefficients of variation (CV) for each analytical parameter. Concentration and time dependence of the CV were checked. The CV were combined to obtain standard deviations for proficiency assessment (Z-score criteria). Furthermore, a viewer program was designed to facilitate monitoring of the analytical performance of participating laboratories.


Interlaboratory comparisons Proficiency testing PT scheme Z-scores Water analysis 



The authors gratefully acknowledge the financial support of the Federal Ministry for Forestry and Agriculture, Environment and Water Management.


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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Wolfgang Kandler
    • 1
    Email author
  • Rainer Schuhmacher
    • 1
  • Susanne Roch
    • 1
  • Patricia Schubert-Ullrich
    • 1
  • Rudolf Krska
    • 1
  1. 1.Institute for Agrobiotechnology (IFA-Tulln)Centre for Analytical Chemistry TullnAustria

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