Add time:08/03/2019         Source:sciencedirect.com

A simple method on dispersive liquid–liquid microextraction combining with smartphone colorimetric analysis was developed to determine trace calcium. The colored complex of calcium and glyoxal bis(2-Hydroxyanil) (GBHA) can be extracted into a mixture solvent of chloroform and 1,2-dichloromethane in the presence of tetradecyldimethylbenzylammonium chloride (zephiramine). The R, G and B value of organic phase after DLLME was caught by Android app Color Grab. The quantitative relationship between the color intensity and calcium content was constructed based on G channel as the analytical signal. The calibration curve was linear in the range of 0.06–1.5 μg mL−1 of calcium ion with a limit of detection (LOD) of 0.017 μg mL−1 and limit of quantification (LOQ) of 0.056 μg mL−1. The proposed method was successfully applied to analyze calcium in water and food samples and validated with FAAS method and CRM material.

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