MIL-STD-1330D(SH) APPENDIX B
20 September 1996
B.5 Apparatus.
(a) A balance accurate to 0.1 mg with a zero drift less than 0.1 mg. A
balance with an accuracy of 0.05 mg with a zero drift less than
0.05 mg is suggested. The balance shall be calibrated in
accordance with the Navy Metrology and Calibration Program, or
equivalent. Between calibrations, the accuracy of the balance
should be verified using certified balance weights. Suitable
balances, such as A&D Model ER-182A or OHAUS Model AP250D, are
available through laboratory supply houses such as Thomas
Scientific.
(b) Balance weights of 1.0, 2.0, 5.0, and 10.0 mg, accurate to 0.02 mg
(NIST Class S or ASTM Class 2) and made from non-magnetic
material.
(c) Disposable Teflon membrane filters of 0.45 or 0.50 micrometer pore
size and 47 millimeter diameter supplied by Savillex Corp., 6133
Baker Rd, Minnetonka, MN 55345, (612) 935-4100, part number 1121;
Millipore Corp., 80 Ashby Rd, Bedford, MA 01730, (617)275-9200,
part number FHUP04700, or equal.
(d) Stainless steel vacuum filtration column with not less than 250 mL
capacity available from laboratory supply houses such as Fischer
Chemical is preferred. Alternately, an inexpensive teflon vacuum
or pressure filtration reservoir of 250 mL capacity minimum is
available from Savillex Corp., 6133 Baker Rd, Minnetonka, MN
55345, (612) 935-4100, consisting of cap with connection for 1/4-
inch tube, part number 501-4; upper segment, part number 504;
lower segment, part number 504-47; and upper/lower segment
connector, part number 502, or equal.
(e) Laboratory homogenizer with 500-1000 watt motor power with a no-
load speed control of 10,000 to 30,000 revolutions per minute
(rpm), and a 20 millimeter diameter saw tooth generator capable of
homogenizing a 1 liter sample into a 1-5 micrometer emulsion at
about 7,500 rpm loaded speed. Suitable homogenizers and
generators are available from Omni International Inc., 6530
Commerce Court, Gainsville, VA (800)776-4431, homogenizer part
number GLH-115 and generator part number G20-195ST; or PRO
Scientific, PO Box 448, Monroe, CT (203)452-9431, homogenizer part
number 01-01250 and generator part number 02-20200. A holder or
stand for the homogenizer is recommended.
(f) A drying oven capable of maintaining a temperature of 55EC (131EF)
to 60EC (140EF).
(g) NOC sample/homogenizing bottles of 1-liter volume for collecting
and homogenizing NOC effluent from oxygen systems or NOC effluent
from oxygen components. Ensure the opening is large enough to
allow insertion of the homogenizer generator (item (e)). Wide
mouth glass sample bottles with external safety coatings and
Teflon lined caps are acceptable, as are sampling containers
manufactured from Teflon, Teflon lined glass, Teflon lined
plastic, or stainless steel. Suitable containers are available
from laboratory supply houses such as Thomas Scientific.
(h) Graduated cylinders of 250 mL minimum volume with minimum
graduations of 50 mL to measure 200 mL of homogenized NOC sample
to be filtered. Cylinders should be glass or polypropylene.
(i) A vacuum collector of 500 mL capacity to collect filtered NOC when
using a vacuum to draw the NOC through the membrane filter,
preferably made of plastic. The stopper used to seal the
collector should be made of Teflon. The stopper requires a 1/4-
inch outside diameter hole for the tube from the filter support.
(j) Beakers of 250 mL capacity to collect the filtered NOC, preferably
plastic, when pressurizing the NOC sample.
(k) Beakers of 250 mL capacity to measure 100 mL of demineralized water
used to wash the membrane filter.
(l) Erlenmeyer flasks of 1 liter capacity, plastic or glass, for
rinsing the homogenizer. Ensure the opening is large enough to
allow insertion of the homogenizer generator (item (e)).
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