A new approach to on-site liquid analysis

Robert U. Seidel, Sim Y. Sim, Wolfgang Menz, Masayoshi Esashi

Research output: Contribution to journalArticlepeer-review


A mixer with an integrated analysis chamber for (bio-) chemical analysis is presented. This mixer as a stand-alone component provides the full functionality of an integrated multicomponent mixing system for one measurement, as both reactants are supplied by capillary forces instead of pumps. Mixing is done by diffusion. Therefore, no additional fluidic components are needed. To evaluate the properties of the mixing process and the suitability for optical sensing, pH values of different solutions have been measured using a universal indicator. The results agreed with macroscopic determination of pH values. An iodine-iodide-reaction was observed using a modified UV/VIS spectrometer and the results agreed with tests performed using cuvettes.

Original languageEnglish
Pages (from-to)57-68
Number of pages12
JournalSensors and Materials
Issue number2
Publication statusPublished - 2000 Dec 1


  • Capillary force
  • Diffusion
  • Microanalysis
  • Mixer
  • On-site analysis
  • Total analysis system
  • μ-TAS

ASJC Scopus subject areas

  • Instrumentation
  • Materials Science(all)


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