Application of ion-selective electrodes in environmental analysis. Determination of Acid and Fluoride concentrations in Rain-water with a Flow-Injection System

J. Fucskó, K. Tóth, E. Pungor, J. Kunovits, H. Puxbaum

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A flow-injection method is described for the measurement of acid and fluoride concentrations. The conditions were optimized to ensure small sample and reagent consumption, low detection limit and the highest rate of analysis allowed by the potentiometric sensor. With a microcapillary pH-sensitive glass electrode, 20-μl sample volumes and 1.0-1.5 ml min-1 carrier flow rates, strong acids were determined at concentrations as low as 10-5 M (0.2 nmol of acid in 20 μ1). The relative standard deviation was about 1% at 10-4 M strong acid concentration at an injection rate of 500-550 h-1. With a flow- through fluoride-selective electrode, 250-μl sample volumes and a 1 ml min-1 carrier flow rates, fluoride concentrations as low as 10-7 M were measured (ca. 0.5 ng of fluoride in 250 μ1). The injection rate was 40 h-1 at concentrations below 10-6 M, but 60 h-1 above 10-5 M. The methods were used successfully for determining the acid and fluoride concentrations in rain-waters.

Original languageEnglish
Pages (from-to)163-170
Number of pages8
JournalAnalytica Chimica Acta
Issue numberC
Publication statusPublished - 1987


ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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