CWEA LAB ANALYST III CERTIFICATION EXAM-
CALIFORNIA WATER ENVIRONMENT AOCIATION
BANK | 2025 COMPLETE CWEA ANALYST III
CERTIFICATION ACCURATE REAL EXAM QUESTIONS
WITH DETAILED ANSWERS | ALREADY GRADED A+
| GUARANTEED EXCELLENCE PASS
Which of the below statements is NOT correct when collecting samples for the
detection of mercury by EPA 245.1 or SM 3112B? - ✔✔✔ Correct Answer > a.
Collect in polyethylene bottle and preserve with nitric acid and measure within
2 weeks.
b. Collect in glass bottle and preserve with nitric acid and measure within 28
days.
c. Collect in fluoropolymer bottle and preserve with nitric acid and measure
within 28 days.
d. All of the above are true.
A toxicity test designed to establish concentration at which a particular end point
occurs is called a: - ✔✔✔ Correct Answer > definitive test.
Which of the following is not a major interference in phenol determination? -
✔✔✔ Correct Answer > Hydroxy derivatives of benzene
Which of the following types of control samples may be used to determine
accuracy? - ✔✔✔ Correct Answer > Certified reference material
, Which of the following types of control samples may be used to determine
precision? - ✔✔✔ Correct Answer > Duplicate
Which of the below statements is correct when collecting samples for the
detection of mercury by EPA 1631? - ✔✔✔ Correct Answer > Collect in
fluoropolymer bottle and preserve with HCl within 48 hours.
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
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
CALIFORNIA WATER ENVIRONMENT AOCIATION
BANK | 2025 COMPLETE CWEA ANALYST III
CERTIFICATION ACCURATE REAL EXAM QUESTIONS
WITH DETAILED ANSWERS | ALREADY GRADED A+
| GUARANTEED EXCELLENCE PASS
Which of the below statements is NOT correct when collecting samples for the
detection of mercury by EPA 245.1 or SM 3112B? - ✔✔✔ Correct Answer > a.
Collect in polyethylene bottle and preserve with nitric acid and measure within
2 weeks.
b. Collect in glass bottle and preserve with nitric acid and measure within 28
days.
c. Collect in fluoropolymer bottle and preserve with nitric acid and measure
within 28 days.
d. All of the above are true.
A toxicity test designed to establish concentration at which a particular end point
occurs is called a: - ✔✔✔ Correct Answer > definitive test.
Which of the following is not a major interference in phenol determination? -
✔✔✔ Correct Answer > Hydroxy derivatives of benzene
Which of the following types of control samples may be used to determine
accuracy? - ✔✔✔ Correct Answer > Certified reference material
, Which of the following types of control samples may be used to determine
precision? - ✔✔✔ Correct Answer > Duplicate
Which of the below statements is correct when collecting samples for the
detection of mercury by EPA 1631? - ✔✔✔ Correct Answer > Collect in
fluoropolymer bottle and preserve with HCl within 48 hours.
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
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
