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.

中文翻译：

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智能手机与纸质光极相结合：走向选择性氰化物检测

_{基于 5,10,15-tritoylcorrolatcobalt(III) 三苯基膦 CoTTCorr(PPh 3} )的低成本纸上传感器被开发用于水溶液中的氰化物检测。该传感器与智能手机耦合，并使用自制的颜色强度分析软件来记录和解释比色响应。氰化物的检测可能低至 0.053 mg/L，比世界卫生组织 (WHO) 为饮用水中氰化物的安全短期暴露设定的 0.5 mg/L 的值低一个数量级。比色传感器对氰化物离子的选择性优于阴离子 Cl-、Br、F-、NO ₂、SCN-、OAC-、ClO ₄ -、H ₂ PO ₄ - 和 HCO ₃ - 而 NO ₃ - 离子对传感器对氰化物的光学响应的​​影响通过优化传感材料内的离子载体/阴离子交换剂比来克服。离子载体与交换剂比率为 1:3 的光极获得了最佳性能。优化的光极用于量化添加到饮用水和唾液中的氰化物含量。