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Comparative studies of the determination of cyanide at low concentration levels in waste waters

✍ Scribed by P.C. do Nascimento; G. Schwedt

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 508 KB
Volume: 283
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(93)85290-z

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✦ Synopsis

Different methods for the determination of cyanide in waste waters were compared. After formation of the stable tetracyanonickelate(II1 anion complex spectrophotometric, polarographic and atomic absorption spectrometric methods were used as off-line systems. Potentiometric determination with a flow-injection system was used on-line. Criteria for the comparison of methods were the limit of detection, linear range, precision, recovery and analysis time. The on-line analysis provided the simplest and most rapid method with a limit of detection of 60 pg 1-l. All the methods used showed a cyanide recovery in waste waters in the range 90-104%. The influence of some interfering ions was also tested.

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