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CWEA - LAB ANALYST III|2023/24 UPDATE|GRADED A+
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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...

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  • August 29, 2023
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  • 2023/2024
  • Exam (elaborations)
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  • cwea lab analyst iii202324 updategraded a

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CWEA - LAB ANALYST III
What does COLOR measure? - correct answer 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? - correct answer 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? - correct answer Extraction


In the cyanide determination, which one of the following is not an interference? - correct
answer Halogenated aromatics


Which of the following is not a major interference in phenol determination? - correct answer
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? - correct answer 0.178 N


What does an ICP source consist of? - correct answer 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? - correct answer Chlorinated hydrocarbon pesticides


Why is methlyene chloride replaced by hexane in sample preparation for analyses detected by
GC electron capture detection (ECD)? - correct answer Chlorine compounds are detected by ECD

, Which of the following methods is used to determine pesticides? - correct answer EPA Method
608


What analysis uses the purge and trap technique? - correct answer 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? - correct answer Enterobacter


The Water Suitability Test (Test for Bacteriological Quality of Reagent Water) determines the
toxic or stimulatory effects of the distilled or deionized water system. Which bacteria genera is
used for this test? - correct answer Enterobacter


Short-term toxicity tests are inappropriate for: - correct answer determining chronic toxicity.


Basic requirements for toxicity tests do not include: - correct answer documented re-use of
control test organisms.


A test in which solutions and test organisms are placed in test chambers and kept there for the
duration of the test is called a: - correct answer static test.


A test in which solution is replaced continuously in test chambers through the test duration is
called a: - correct answer flow through test.


A preliminary test designed to establish approximate toxicity of a solution is called a: - correct
answer range finding test.


A toxicity test designed to establish concentration at which a particular end point occurs is
called a: - correct answer definitive test.

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