11.2.6
instructions on the analysis sequence, appropri-
Place a test tube in the vacuum flask or mani-
ate dilutions, establishing daily retention time
fold such that it fits over the funnel exit when the
windows, and identification criteria. Include a
flask or manifold is reattached to the fritted base.
mid-level standard after each group of 10 sam-
The actual size of the test tube depends upon the
ples in the analysis sequence.
brand of vacuum flask or manifold.
13.0 POLLUTION PREVENTION
11.2.7
All containers of organic solvents and extrac-
Add a 5-mL aliquot of acetonitrile to the reser-
tion solutions should be kept capped to prevent
voir, and allow this acetonitrile to soak into the
evaporation. A large tray should be used under
disk for three minutes. Apply the vacuum, draw-
the work area to contain any spilled solvents.
ing the acetonitrile through the disk into the test
tube. Use a Pasteur pipet to transfer the solvent
extract to a 5-mL graduated cylinder, and mea-
14.0 WASTE MANAGEMENT
sure the actual volume (0.1 mL) of the solvent
extract.
All waste should be disposed of according to fed-
eral, state, and local regulations.
11.2.8
If the extract is turbid, filter through a Millex-
15.0 REFERENCES
SR filter unit.
Hable, M., C. Stern, C. Asowata, and K. Williams
(1991) The determination of nitroaromatics and
11.2.9
nitramines in ground and drinking water by
Store extracts in a freezer until analysis.
wide-bore capillary gas chromatography. Journal
of Chromatographic Science, 29: 131135.
12.0 DATA ANALYSIS AND CALCULATIONS
USEPA (1996) Test method for evaluating solid
waste: Physical/chemical methods (SW-846).
Analyze the samples using the chromatographic
U.S. Environmental Protection Agency, Office of
conditions given for the GC in Section 10.8.
Solid Waste, Washington, D.C.
Follow Section 7 in SW-846, Method 8000B, for
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