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An easily performed stepwise injection (SWIA) procedure based on on-line dilution of biodiesel samples and the formation of color-forming calcium (II) and magnesium (II) complexes with Eriochrome Black T (EBT) in an organic medium followed by spectrophotometric determination is presented. A sample of biodiesel was placed at the bottom of a mixing chamber connected to an automatic SWIA manifold. Isopropyl...
Recently suggested multicommutated stepwise injection analysis (MCSWIA) coupled with classical least squares method (CLS) has been developed for silicon, phosphorus, iron and aluminum determination in biodiesel samples after a microwave digestion. This method allows to carry out four color-forming reactions simultaneously: aluminum (III) and iron (III) with chromazurol S and phosphate and silicate...
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