1-20
REQUIRED APPARATUS
Description Unit Cat. No.
Filter Discs, glass 47 mm . . . . . . . . . . . . . . .100/pkg . . . . . . . . 2530-00
Filter Holder, membrane . . . . . . . . . . . . . . . .each . . . . . . . . . . . 2340-00
Flask, filter, 1000 mL . . . . . . . . . . . . . . . . . .each . . . . . . . . . . . . 546-53
Many of the procedures in this manual may be filtered with gravity
filtration. The only labware required is filter paper, a conical funnel and
a receiving flask. This labware is included under the Optional
Apparatus listing for each procedure. Gravity filtration provides better
retention of fine particles. For optimum filtering speed, add solution
until the filter paper cone is three-fourths filled. Never fill the cone
completely. Gravity filter (see Figure 5) as follows:
1. Place a filter paper into the funnel.
2. Wet the filter with deionized water to ensure adhesion to the funnel.
3. Place the funnel into an erlenmeyer flask or graduated cylinder.
4. Pour the sample into the funnel.
Figure 5 Gravity Filtration
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