Abstract
Filter paper-based optical sensors (FPOS) offer rapid and sensitive quantification of analytes. Herein we report, a simple, sensitive, selective and low-cost FPOS for Th(IV) determination. Filter paper strips, impregnated with Morin reagent are reacted with Th(IV) yielding an intense yellow complex whose RGB (red/green/blue) color intensities made the basis of the assessment. A plot of the blue channel color absorbance versus Th(IV) concentration was linear up to 4.0 µg mL− 1 with a detection limit of 0.1 µg mL− 1. The proposed method was accurate, precise and reliable for analyzing complex certified rock samples in excellent compliance with the certified values.
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Mohamed, A.A., Abd El-Hay, I.M., El Wakil, A.F. et al. Filter paper-based optical sensor for the highly sensitive assessment of thorium in rock samples. J Radioanal Nucl Chem 326, 387–391 (2020). https://doi.org/10.1007/s10967-020-07286-3
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DOI: https://doi.org/10.1007/s10967-020-07286-3