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.
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.
Solvent Filtering Dispenser.