In this study, we developed an effective method to detect hypochlorite acid (HClO) by using methylene blue (MB) derivative (BPY1). BPY1 was selectively oxidized through HClO, and the solution color changed from colorless to blue. In the presence of HClO, the ultraviolet–visible (UV–vis) spectra and concentration of HClO had a linear relationship with a detection limit of 0.5 μM. Furthermore, a test paper for HClO monitoring was successfully prepared using the BPY1 probe, and the observed detection limit by the naked eye was estimated at 5 μM. Additionally, using the BPY1 probe, HClO could also be detected through smartphone colorimetry, and the method showed a good recovery ranging from 98.7 to 104.0% for HClO detection in an actual water sample. Especially for developing countries, such a low-cost and highly sensitive detection method provides a simple and practical method for monitoring HClO in water.
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GB 5749–2006, Set by the standardization a dministration of the people’s republic of China
We are grateful to the National Natural Science Foundation of China (Nos. U1404215, 22074089, 21804085, 21675109), Innovation Scientists and Technicians Troop Construction Projects of Henan Province (No: 41) and Key Scientific Research Projects of Colleges and Universities in Henan Province (No: 21A150043) for support.
Conflict of interest
The authors declare that there are no conflicts of interest.
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He, S., Dong, H., Hao, Y. et al. Quantifying Hypochlorous Acid Concentration in Environmental Water Using Smartphone Colorimetry. J. Anal. Test. (2021). https://doi.org/10.1007/s41664-021-00156-1
- Smartphone colorimetry
- Test strips
- Hypochlorite acid
- Methylene blue