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- W2900106906 abstract "Methanol is used in transesterification reaction for biodiesel production, being an important quality parameter to evaluate the purity of the final product. Methanol concentrations higher than 0.20% (m/m) reduce the biofuel efficiency. The Brazilian, United States, and European standards recommend the reference method based on gas chromatography with flame ionization detection, which involves a time-consuming procedure and requires high-cost equipment. In this work, it is proposed a simple and low cost spot test based on digital images acquired with a smartphone camera for the determination of methanol in biodiesel. The procedure was based on the oxidation of methanol to formaldehyde and subsequent reaction with Schiff reagent, resulting in a violet product. Analytical signals were based on the reflected radiation measured on the G channel (RGB system), which refers to the complementary color of the reaction product. Linear responses were obtained within 20-500 mg kg-1 and 500-2000 mg kg-1 methanol for 600 and 150 µL of sample aqueous extracts, respectively. The coefficient of variation (n = 10) and the limit of detection (99.7% confidence level) were estimated as 4.8% and 10 mg kg-1 (600 µL of sample), respectively. The procedure requires only 75 µg of potassium permanganate, 6 mg of oxalic acid, and 1.5 mg of p-rosaniline and generates ca. 1.2 mL of residue per determination. The results agreed with those obtained by the reference procedure at the 95% confidence level, demonstrating that the proposed method is an alternative for routine analysis of the biofuel." @default.
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- W2900106906 date "2019-04-01" @default.
- W2900106906 modified "2023-10-14" @default.
- W2900106906 title "A novel spot test based on digital images for determination of methanol in biodiesel" @default.
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- W2900106906 doi "https://doi.org/10.1016/j.talanta.2018.11.028" @default.
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