مشخصات پژوهش

Health risks of heavy metals (HMs) contribute to advances in diagnosis and treatment of polluted water is an important subject for scientific society [1]. New methods of point of care testing (POCT) include tests in which samples are analyzed at the sampling site [2, 3]. This article describes smartphone-based POCT for cadmium in water. In this study, cadmium quantification was done by a light control box that contains a white light-emitting diode (LED). The dithizone ligand was used to produce a specific dye solution. The results of the free Color Grab application confirm that the cadmium concentration is proportional to the intensity of the red color. The calibration graph was linear range in the range of 0.05‒1.0 mg L −1 with a limit of detection (LOD) of 0.01 mg L ‒1 , whereas the quantification limit was 0.04 mg L ‒1 . The average recovery rate for cadmium spiked in the water samples was 99.4%. Cadmium was determined in well water, tap water, and commercial water samples. The accuracy of smartphone-based digital imaging method was acceptable compared to atomic absorption spectrophotometric data (paired t-test). Smartphone-based POCT tests are costeffective, accurate, and easy to perform in areas with limited resources. Therefore, they are considered a potential for routine diagnostic tests.