Journal
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
Volume 24, Issue 5-7, Pages 964-972Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S1088424620500091
Keywords
5,10,15-tritolyl corrolate Co(III) triphenylphosphine; cyanide sensor; colorimetric detection
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Funding
- Robert A. Welch Foundation [E-680]
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A low-cost on-paper sensor based on 5,10,15-tritolylcorrolatocobalt(III) triphenylphosphine, CoTTCorr(PPh3), was developed for cyanide detection in aqueous solutions. The sensor was coupled to a smartphone and used a home-written color intensity analysis software in order to record and interpret the colorimetric response. The detection of cyanide was possible down to 0.053 mg/L an order of magnitude lower than the value of 0.5 mg/L set by the World Health Organization (WHO) for safe short-term exposure of cyanide in potable water. The colorimetric sensor had selectivity toward cyanide ions over the anions Cl-, Br, F-, NO2-, SCN-, OAc- ,ClO4-, H2PO4- and HCO3- while the influence of NO3 ions on the sensor optical response towards cyanide was overcome by optimization of the ionophore/anion-exchanger ratio inside the sensing material. The best performance was obtained for the optode with an ionophore to exchanger ratio of 1:3. The optimized optodes were employed for quantification of cyanide content added to potable water and saliva.
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