اندازه‌گيري مقادير كم برومات در نمونه‌هاي آبي با استفاده از سيستم رنگ‌سنجي مبتني بر تلفن هوشمند و روش ريز استخراج مايع مايع پخشي (DLLME)

In this study, a rapid, sensitive, an‎d cost-effective method was developed for the determination of bromate anions in aqueous samples using a smartphone-based colorimetric detection system. The method is based on the dispersive liquid–liquid microextraction (DLLME) of bromate via ion-pair formation with trimethylalkylammonium chloride, followed by a colorimetric reaction with pararosaniline to produce a stable pink-colored product. After extraction, the organic phase was transferred to a microtube, an‎d the developed color was captured using a smartphone camera. Quantitative analysis was performed by direct eva‎luation of the RGB color components using a colorimetric mobile application. A linear correlation between color intensity an‎d bromate concentration was established, with the green channel selec‎ted as the analytical signal due to its superior sensitivity. The effects of key experimental parameters, including sample pH, type an‎d volume of extraction an‎d dispersive solvents, ion-pair concentration, an‎d reagent amount, were systematically optimized. Under optimal conditions, the calibration curve was linear over the concentration range of 10–900 µg L⁻¹, with limits of detection (LOD) an‎d quantification (LOQ) of 4 an‎d 13 µg L⁻¹, respectively. The proposed method was successfully applied to real water samples, yielding satisfactory recoveries in the range of 91–101%. Owing to its simplicity, low solvent consumption, portability, an‎d adequate sensitivity, the developed approach represents an effective an‎d practical tool for on-site determination of bromate in water samples

محمد سراجي

اسماعيل حيدري بفرويي , محمد تقي جعفري