碘酸盐
盐(化学)
检出限
试剂
基质(化学分析)
化学
色谱法
数字图像
分析化学(期刊)
材料科学
计算机科学
无机化学
人工智能
图像处理
图像(数学)
物理化学
碘化物
作者
Henley F. Galiga,Fortunato Sevilla
标识
DOI:10.1016/j.foodchem.2023.135741
摘要
A digital colorimetric sensor was developed for the on-site measurement of iodate in food-grade salt. It involved a paper-based analytical device (PAD) containing an immobilized iodide/starch reagent and a smartphone as the detection system. Iodate ions produce a blue-black coloration on the PAD, the smartphone captures a digital image of the PAD, and an installed mobile app performs an analysis to generate color values related to the intensity of the color in the PAD. Parameters in the image acquisition and PAD preparation were optimized, and a matrix-matched calibration plot was employed for quantification. The plot exhibited a linear response in the concentration range of 10 to 100 mg iodate kg-1 of salt, and a detection limit of 2.20 mg kg-1 was determined. The present method was applied to analyze real samples, and the results agreed well with those obtained using the reference method at the 95% confidence level.
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