CWEA LABORATORY ANALYST EXAM SCRIPT
2026 ACCURATE REAL EXAM QUESTIONS
WITH SOLUTIONS GRADED A+
◉ What is the test summary for COLOR? 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? Answer: Extraction
◉ In the cyanide determination, which one of the following is not an
interference? Answer: Halogenated aromatics
◉ Which of the following is not a major interference in phenol
determination? 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? Answer: 0.178 N
, ◉ What does an ICP source consist of? 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? Answer: Chlorinated
hydrocarbon pesticides
◉ Why is methlyene chloride replaced by hexane in sample
preparation for analyses detected by GC electron capture detection
(ECD)? Answer: Chlorine compounds are detected by ECD
◉ Which of the following methods is used to determine pesticides?
Answer: EPA Method 608
◉ What analysis uses the purge and trap technique? 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? Answer: Enterobacter
◉ The Water Suitability Test (Test for Bacteriological Quality of
Reagent Water) determines the toxic or stimulatory effects of the
2026 ACCURATE REAL EXAM QUESTIONS
WITH SOLUTIONS GRADED A+
◉ What is the test summary for COLOR? 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? Answer: Extraction
◉ In the cyanide determination, which one of the following is not an
interference? Answer: Halogenated aromatics
◉ Which of the following is not a major interference in phenol
determination? 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? Answer: 0.178 N
, ◉ What does an ICP source consist of? 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? Answer: Chlorinated
hydrocarbon pesticides
◉ Why is methlyene chloride replaced by hexane in sample
preparation for analyses detected by GC electron capture detection
(ECD)? Answer: Chlorine compounds are detected by ECD
◉ Which of the following methods is used to determine pesticides?
Answer: EPA Method 608
◉ What analysis uses the purge and trap technique? 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? Answer: Enterobacter
◉ The Water Suitability Test (Test for Bacteriological Quality of
Reagent Water) determines the toxic or stimulatory effects of the
