apparatus listed in 2540B2a-h is required, and addition:
a. Glass-fiber filter disk* without organic binder.
b. Filtration apparatus: One of the following , suitable for the filter disk selected:
1. membrane filter funnel.
2. Gooch crucible ,25 ml to 40 ml capacity, with Gooch crucible adapter.
3. filtration apparatus with reservoir and coarse (40-60 um) frited disk as filter support.
c. Suction flask, of sufficient capacity for sample size selected.
d. Drying oven, for operation at