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A multi-pumping flow-based procedure with improved sensitivity for the spectrophotometric determination of acid-dissociable cyanide in natural waters

Frizzarin, Rejane M. ; Rocha, Fábio R.P.

Analytica chimica acta, 2013-01, Vol.758, p.108-113 [Periódico revisado por pares]

Amsterdam: Elsevier B.V

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  • Título:
    A multi-pumping flow-based procedure with improved sensitivity for the spectrophotometric determination of acid-dissociable cyanide in natural waters
  • Autor: Frizzarin, Rejane M. ; Rocha, Fábio R.P.
  • Assuntos: Acid-dissociable cyanide ; Analytical chemistry ; Chemistry ; Exact sciences and technology ; Flow analysis ; Gas-diffusion ; Liquid-core waveguide ; Multi-pumping ; Spectrometric and optical methods ; Spectrophotometry
  • É parte de: Analytica chimica acta, 2013-01, Vol.758, p.108-113
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: [Display omitted] ► Inexpensive, fast and environmentally friendly spectrophotometric determination of acid dissociable cyanide. ► Novel analytical method based on the reaction with the Cu(I) complex with 2,2′-biquinoline 4,4′-dicarboxylic acid. ► Long pathlength spectrophotometry exploited for the first time to increase sensitivity in discolorimetry. ► Pulsed flow to improve gas-diffusion efficiency. ► One of the lowest detection limits without impairing the sample throughput or using toxic chemicals. An analytical procedure with improved sensitivity was developed for cyanide determination in natural waters, exploiting the reaction with the complex of Cu(I) with 2,2′-biquinoline 4,4′-dicarboxylic acid (BCA). The flow system was based on the multi-pumping approach and long pathlength spectrophotometry with a flow cell based on a Teflon AF 2400® liquid core waveguide was exploited to increase sensitivity. A linear response was achieved from 5 to 200μgL−1, with coefficient of variation of 1.5% (n=10). The detection limit and the sampling rate were 2μgL−1 (99.7% confidence level), and 22h−1, respectively. Per determination, 48ng of Cu(II), 5μg of ascorbic acid and 0.9μg of BCA were consumed. As high as 100mgL−1 thiocyanate, nitrite or sulfite did not affect cyanide determination. Sulfide did not interfere at concentrations lower than 40 and 200μgL−1 before or after sample pretreatment with hydrogen peroxide. The results for natural waters samples agreed with those obtained by a fluorimetric flow-based procedure at the 95% confidence level. The proposed procedure is then a reliable, fast and environmentally friendly alternative for cyanide determination in natural waters.
  • Editor: Amsterdam: Elsevier B.V
  • Idioma: Inglês
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