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A Portable Cyanide Analyzer Using Gold Wire Electrodes
Author(s) -
Sequeira Margaret,
Hibbert D. B.,
Alexander P. W.
Publication year - 1999
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199906)11:7<494::aid-elan494>3.0.co;2-s
Subject(s) - repeatability , electrode , spectrum analyzer , reproducibility , analytical chemistry (journal) , calibration , materials science , potentiometric titration , cyanide , calibration curve , peristaltic pump , chemistry , detection limit , optics , chromatography , mathematics , physics , statistics , meteorology , metallurgy
We report on a continuous flow potentiometric analyzer for cyanide incorporating multiple gold‐wire electrodes. The portable apparatus comprised a low‐powered peristaltic pump, a Perspex multicell incorporating six indicator and six reference electrodes connected to an eight channel A/D converter. Real‐time data may be displayed on a notebook computer. The system performance was optimized for sample peak heights, reproducibility, working ranges and calibration slopes. Well‐ defined peaks and fast response times (with peak widths <20 s) were observed using a carrier of 0.1 M sodium hydroxide at a flow rate of 5 mL min –1 . The repeatability of the electrode response was 2.3 % n=. The log–linear range was 0.25 to 70 ppm (9.6 to 2700 μAM) with slopes 96, 205 and 450 mV decade –1 for one, three and six electrodes in series, respectively.