Abstract
The Berthelot reaction is a classic method for detection of ammonium (NH4+) and atmospheric ammonia (NH3) by using salicylic acid (SA) as the chromogenic substrate. However, there lacks a method for improving the activity of the Berthelot reaction to enhance the analytical performance for detection of NH4+ and NH3. Here, five SA analogues with electron-withdrawing groups (-F) and electron-donating groups (-CH3 and -OCH3) at different positions of the aromatic ring have been chosen as the alternative to SA for Berthelot reaction. Among these analogues, 4-methoxysalicylic acid (4-OCH3-SA) shows the best colorimetric response and color change at a NH4+ concentration of 30 μM, and the sensitivity of 4-OCH3-SA-based colorimetric assay for NH4+ increases 1.75-fold compared with that of SA-based colorimetric method. This enhancement effect is attributed to the strong electron-donating property of 4-OCH3 group, activating the two-step electrophilic aromatic substitution reaction in the Berthelot reaction. Additionally, visual and sensitive detection of NH3 is realized, along with a low limit of detection down to 0.037 ppm. Furthermore, we demonstrate that this assay is reliable and practical for detection of NH4+ and NH3 in real water and air samples with good accuracy.
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We received financial support of the National Natural Science Foundation of China (41831285).
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Yu, H., Zhang, G., Cai, Y. et al. Altering the substituents of salicylic acid to improve Berthelot reaction for ultrasensitive colorimetric detection of ammonium and atmospheric ammonia. Anal Bioanal Chem 413, 5695–5702 (2021). https://doi.org/10.1007/s00216-021-03485-3
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DOI: https://doi.org/10.1007/s00216-021-03485-3