Abstract
In this study, a fast and simple method has been developed for the determination of nitrite in different aqueous samples. The method, which can be applied for on-site as well as off-site analyses, is based on the reaction of nitrite with potassium iodide in an acid medium to liberate triiodide ions. These liberated triiodide ions react with starch adhesive to form a dark blue complex, which is quantified by digital imaging using an ordinary smartphone and a freely available mobile application. Image analysis was done in the RGB color space, and the B-channel values were used to obtain the analytical signal. Under the optimum conditions, the method showed a linear range of 0.05–1 mg/L and a detection limit of 0.013 mg/L. The relative standard deviation for the determination of 0.5 mg/L nitrite was found to be 2.2% (n = 6). The results obtained using the proposed method were evaluated by comparing them to those obtained by a commercial UV-Vis spectrophotometer and also by analyzing spiked samples to calculate recovery percentages.
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ACKNOWLEDGMENTS
The authors gratefully acknowledge Azarbaijan Shahid Madani University Research Council for the financial support to this work.
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This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.
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Khoshmaram, L., Tabaghchi, S. Feasibility of Digital Image-Based Colorimetry for On-Site Determination of Nitrite in Water Samples. J Anal Chem 79, 426–429 (2024). https://doi.org/10.1134/S1061934824040075
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DOI: https://doi.org/10.1134/S1061934824040075