CWEA - Lab Analyst III Questions and Correct Answers
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Course
CWEA
Institution
CWEA
CWEA - Lab Analyst III Questions and Correct
AnswersCWEA - Lab Analyst III Questions and Correct
AnswersCWEA - Lab Analyst III Questions and Correct
Answers
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CWEA - Lab Analyst III Questions and Correct
Answers
What does COLOR measure?
✓ ~: Amount of color units (CU) in a sample. Color caused by natural metallic ions (Fe &
Mg) & industrial wastes.
What is the test summary for COLOR?
✓ ~: Sample -> Tubes -> Compare to color standards over light source
Which of the following techniques is used to isolate anionic surfactants (as MBAS) from the
sample matrix?
✓ ~: Extraction
In the cyanide determination, which one of the following is not an interference?
✓ ~: Halogenated aromatics
Which of the following is not a major interference in phenol determination?
✓ ~: Hydroxy derivatives of benzene
A freshly prepared sodium hydroxide (NaOH) solution is standardized against primary
standard potassium acid phthalate (KHC8H4O4). 0.8000 grams of potassium acid phthalate
was dissolved into 50 mL CO2-free water. 2-3 drops of phenolphthalein were added. The
sample was titrated to a faint pink endpoint with 22 mLs sodium hydroxide. What is the
normality of the sodium hydroxide?
, <<<<< Elscores <<<<<>>>>> 19/08/2024 20:17>>>>>
✓ ~: 0.178 N
What does an ICP source consist of?
✓ ~: A flowing stream of argon gas ionized by an applied radio frequency
In gas chromatography, electron capture detectors (ECD) are used to detect which of the
following compounds?
✓ ~: Chlorinated hydrocarbon pesticides
Why is methlyene chloride replaced by hexane in sample preparation for analyses detected by
GC electron capture detection (ECD)?
✓ ~: Chlorine compounds are detected by ECD
Which of the following methods is used to determine pesticides?
✓ ~: EPA Method 608
What analysis uses the purge and trap technique?
✓ ~: Volatile organic compound analysis
The test for inhibitory residues on glassware and plastic ware determines the toxic or
stimulatory effects of dishwashing detergents used for bacterial analysis. Which bacterial
genera is used for this test?
✓ ~: Enterobacter
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