Molecular absorption spectrophotometric method for the determination of phosphorus in biodiesel

► Determination of phosphorus in biodiesel. ► Molecular absorption spectrophotometric quantitative analysis. ► Molybdenum blue complex. ► Reducing agent 1-amino-2-naphthol-4-sulfonic acid. ► Applied to biodiesels from soy, canola and sunflower oils and from bovine fat.