Ashing for 50–80 s was suitable for less than 10 mg of dried samples of grain and
animal foods; ashing for 40 s at 60 W followed by 60 s at 100 W was suitable for 25–30 mg
of fresh and high-fiber samples of vegetable, fruit and animal foods. The ashing procedure
could be adjusted according to the ashing result of real sample residue on the basis of this
proposed program.