5. Use one of the following methods to prepare filter samples and blanks:
a. Low Temperature Ashing: Place the filters in 50-mL beakers within the low temperature asher
so that the sample exposure to the plasm a is optim ized. Ash according to manufacturer's
instructions. After ashing, carefully add 15 mL 2-propanol to each beaker; or
b. Muffle Furnace Ashing: