D.Procedures
(a) Pre-treatment. -Homogenize product if necessary, using
noncontaminating equipment. Check for leaching metals if
the apparatus consists of metal parts.
(b) Drying. -In a crucible, weigh 10-20 g test portion to nearest
0.1 g. Dry in a drying over, on a water-bath, or a hot plate at 100 C
if there is arisk of heavy boiling in the ashing step. Proced according
to type of furnace.
(c) Ashing. - (1) Ashing in a programmable