Colorimetric determination of 1-naphthol on a polymethacrylate sensor
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https://doi.org/10.32523/3107-278X-2026-154-1-60-74Keywords:
polymethacrylate matrix, 1-naphthol, colorimetry, solid phase extraction, diazotizationAbstract
A method for the in-laboratory determination of the degradation product of carbamate pesticides using a colorimetric polymethacrylate sensor has been developed, which ensures the portability and efficiency of the analysis. 1-naphthol is extracted into the sensor volume, followed by colorimetric determination of its amount from a digital image. The digital images of the sensor are converted into red, green and blue (RGB) channels of color coordinates using a smartphone, then a color image processing algorithm is used, which calculates the average value of the RGB color coordinates. The fundamental possibility of using a polymethacrylate matrix as an analytical medium for test systems and digital colorimetry in the determination of 1-naphthol has been experimentally confirmed. It is shown that modified polymer transparent sensors measuring 4.0×4.0 mm provide an optimal combination of extraction ability and optical characteristics. The method of using PMM showed sufficient sensitivity for most definitions with a detection limit of 0.1 mg/kg and a linear range of 0.5-8.0 mg/kg for visual detection and 0.2-16.0 mg/kg for digital colorimetric detection.
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