Complete digestion of chocolate samples
For the acid digestion, which was used as an alternate
technique to establish the accuracy of the proposed
method, approximately 0.25 g chocolate sample, 3.0 mL
concentrated nitric acid, and 2.0 mL hydrogen peroxide
were placed in a Teflon vessel, which was closed and
placed in a pressurized digestion system. Heating was
performed in an oven at 160C for 16