11.
The preferred method for sterilizing the funnel and filter--support assembly is in an
________________ when using the bacteriological water testing kit.
12.
Membrane filters and absorbent pads must be autoclaved for ____ minutes
at ______oC.
13.
What is the recommended basic filtering volume (BFV) of an average coliform
density if the previous tests on a given water source of same shows an average
coliform density of 67 colonies per 100 ml? ____________ ml.
14.
If three sample volumes (as noted in 13 above) are to be filtered, what should they
be? _____, _____, and _____ ml.
15.
After filtering, the filter and absorbent pad are incubated for __________ hours
at ______oC.
16.
If a petri dish contains 36 typical coliform colonies, and the volume of sample
filtered was 60 ml, what is the coliform count? ______ per 100 ml.
17.
Which of the following test(s) is (are) used to specifically identify the source of
water contamination (human or animal origin)?
a. Multiple-tube fermentation.
b. Fecal coliform.
c.
Total coliform.
d. Fecal streptococci.
18.
How many water samples are required per month from a water supply system
serving a military installation with a population of 6,000 persons? __________
MD0160
3-32
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