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CWEA LAB ANALYST COMPLETE SET EXAM QUESTIONS & VERIFIED ANSWERS

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CWEA LAB ANALYST COMPLETE SET EXAM QUESTIONS & VERIFIED ANSWERS

Institution
CWEA LABORATORY
Course
CWEA LABORATORY

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Settleable solids may be determined


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On a Gravimetric basis and reported as milligrams per liter




A dissolved oxygen sample should not be agitated or remain in contact with the
atmosphere because


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The gaseous content of the sample may change

Agitation exposure to the atmosphere may add more oxygen to the sample
then would normally be there.

,The ability to trace sample possession and handling from the time of collection
through analysis and final disposal is known as


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Chain of custody




Compared to a solution with a pH of four and acid solution with a pH of two is


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100 times as acidic




When performing an amperometric titration for chlorine, how many milliliters of
sample should be analyzed?


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200 mL




The correct preservation and hold time for samples being stored before acidity or
alkalinity measurements is


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, 14 days at 4°C




When computing the density of a fecal coliform plate, what is the desired range of
colonies?


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20 to 60 CFU/100 mL




The mercuric nitrate titration technique for measuring chloride is falling into disuse in
the laboratory because the:


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technique is lengthy and requires highly skilled instrument technicians to
accurately analyze the samples.




The intermediate oxidation stage of nitrogen between ammonia and nitrate nitrogen
is


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Nitrite nitrogen




Hood flow should be monitored and documented at:

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100 linear feet per minute




The oxygen depleted during the five day BOD test is used by


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microorganisms




When performing microbiological examinations, sterilize glassware by placing it in an
oven at


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170°C for at least 1 hour




Laboratory glassware that meets US specifications for certified glassware is
designated as


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Class A




The MPN test for coliform bacteria has three test phases, which are

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Institution
CWEA LABORATORY
Course
CWEA LABORATORY

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Uploaded on
May 30, 2026
Number of pages
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Written in
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Type
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Questions & answers

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