Measurement of nitrate gradients with an ion-selective microelectrode

  • de Beer D
  • Sweerts J
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Abstract

Nitrate-selective microelectrodes (1-μm tip diameter) with a liquid membrane ion exchanger were prepared. The response of the electrode is linear from 10-1to 10-5M nitrate and the response time is 30 s. Selectivity coefficients are of the same order as specified for macroelectrodes. Measurements in sediments of a mesotrophic lake and measurements in spherical agar gels with immobilized denitrifying bacteria are presented. © 1989.

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Authors

  • Dirk de Beer

  • Jean Pierre R.A. Sweerts

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