Biodiesel samples (1 g) were digested in a solution prepared with 10.0 mL nitric acid 65%, 2.0 mL sulfuric acid PA and 6.0 mL of 30% hydrogen peroxide.
Biodiesel samples (1 g) were digested in a solution prepared with 10.0 mL nitric acid 65%, 2.0 mL sulfuric acid PA and 6.0 mL of 30% hydrogen peroxide.