Add time:09/01/2019         Source:sciencedirect.com

A cheap and simple procedure for the simultaneous colorimetric determination of glycerol, magnesium and calcium in biodiesel samples using a paper-based analytical device (PAD) was developed. A reversed-phase air-assisted dispersive liquid-liquid microextraction (RP-AA-DLLME) approach was proposed and used for glycerol, magnesium and calcium separation from biodiesel samples into aqueous phase (sodium periodate solution). After RP-AA-DLLME the obtained hydrophilic emulsion (biodiesel fuel in water) containing target analytes was introduced to a sample zone of the PAD, and as the emulsion penetrated through hydrophilic cellulose fibers to detection zones its destruction was observed. Colorimetric detection of calcium and magnesium with Eriochrome Black T and derivative of glycerol (formaldehyde) with acetylacetone on the detection zones of the PAD was implemented using conventional scanner and Corel® PHOTO-PAINT™ X7 software. Under optimal conditions, the calibration curves were linear in the ranges 100–300 μg g−1 for glycerol and 1–15 μg g−1 for calcium and magnesium. The limits of detection, calculated from a blank test based on 3σ, were 30 μg g−1 for glycerol and 0.3 μg g−1 for calcium and magnesium. The PAD was successfully applied for biodiesel samples analysis.

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