Figure 2-11. Solvent Filtering Dispenser.

TM 5-6640-213-14

4. Consult ASTM D-86 petroleum testing refer-

ences for detailed description of test procedure.

(6) Microporous Filtering Disk Holder.

(a) Description. Pyrex filter holders are used in the

laboratory to collect particulate material from liquids in accordance

with ASTM D-2276. One gallon (3.785 liters) of liquid is filtered

using the holder, a laboratory vacuum and a side-arm flask. The

sample volume actually used must be reported.

(b) Operating Instructions. Complete instructions

for preparation of the test and control membrane filters and field

monitors are described in ASTM D-2276.

(7) Solvent Filtering Dispenser.

(a)

Description.

1. The solvent filtering dispenser (fig. 2-11)

cleans small volumes by millipore filtration at the point of use,

which eliminates the need for precleaning and the possibility of

contaminating clean liquids. The dispenser is a combination of a

millipore filter holder and a Guth wash bottle. Hand pressure forces

solvents through the millipore filter as they are needed. The

dispenser consists of a pyrex l-liter flask with a neoprene bulb and

stopper, a stainless steel filter holder and support screens with

teflon gaskets and teflon tubing.

Delivery tube

Flask

Filter holder

Uptake tube

Bulb

Pressure release

Solvent Filtering Dispenser.