CWEA LABORATORY ANALYST EXAM ALL
GRADES 2025/2026 BANK | ACCURATE REAL
EXAM VERSIONS | CURRENTLY TESTING
WITH A STUDY GUIDE AND KNOWLEDGE
CHECK FLASHCARDS | GUARANTEED PASS
WELL RESERCHED AND EXPERTLY
VERIFIED
BRAND NEW!!
When two of three successive determinations fall outside
the warning limits: - ....ANSWER...Another determination
should be made, and if it is within the warning limits no
action is needed.
1
,Which of the below statements is NOT correct when
collecting samples for the detection of mercury by EPA
245.1 or SM 3112B? - ....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.
Which of the below statements is correct when collecting
samples for the detection of mercury by EPA 1631? -
....ANSWER...Collect in fluoropolymer bottle and preserve
with HCl within 48 hours.
Alkalinity - Bottle, Preservation, Hold Time -
....ANSWER...250mL plastic/glass, unpres, 14 days
1,4 Dioxane - Bottle, Preservation, Hold Time -
....ANSWER...500ml amber, sulfite/bisulfate, 28 days
2
,Ammonia - Bottle, Preservation, Hold Time -
....ANSWER...500ml plastic/glass, pH<2 H2SO4, 28 days
BNAS - Bottle, Preservation, Hold Time -
....ANSWER...1L amber glass, sod thiosulfate, 7 days
BOD / cBOD - Bottle, Preservation, Hold Time -
....ANSWER...1L plastic/glass, unpreserved, 48 hr
Metals - Bottle, Preservation, Hold Time -
....ANSWER...500ml plastic, HNO3 pH<2, 6 mo
300.1 (Bromate, Chlorate, Chlorite) - Bottle, Preservation,
Hold Time - ....ANSWER...500ml plastic/glass, EDA, 28
days
300.0 + 300.1 (All Others)- Bottle, Preservation, Hold
Time - ....ANSWER...plastic/glass, unpres, 28 days
Chlorine Demand - Bottle, Preservation, Hold Time -
....ANSWER...amber, unpres, 24 hr
Chlorine, Total Residual - Bottle, Preservation, Hold Time
3
, - ....ANSWER...plastic/glass, unpres, 0.25hr
COD - Bottle, Preservation, Hold Time -
....ANSWER...plastic/glass, H2SO4 pH<2, 28 days
Color (Spec) - Bottle, Preservation, Hold Time -
....ANSWER...amber plastic/glass, unpres, 48 hr
Color (Vis) - Bottle, Preservation, Hold Time -
....ANSWER...amber plastic/glass, unpres, 24 hr
Cyanide - Bottle, Preservation, Hold Time -
....ANSWER...amber plastic/glass, absorbic
acid(dechlor) NaOH pH>11, 14 days
DOC - Bottle, Preservation, Hold Time -
....ANSWER...glass/voa, filter & pH<2 H3PO4, 28 days
HAA - Bottle, Preservation, Hold Time -
....ANSWER...amber glass, ammonium chloride, 14
days
4
GRADES 2025/2026 BANK | ACCURATE REAL
EXAM VERSIONS | CURRENTLY TESTING
WITH A STUDY GUIDE AND KNOWLEDGE
CHECK FLASHCARDS | GUARANTEED PASS
WELL RESERCHED AND EXPERTLY
VERIFIED
BRAND NEW!!
When two of three successive determinations fall outside
the warning limits: - ....ANSWER...Another determination
should be made, and if it is within the warning limits no
action is needed.
1
,Which of the below statements is NOT correct when
collecting samples for the detection of mercury by EPA
245.1 or SM 3112B? - ....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.
Which of the below statements is correct when collecting
samples for the detection of mercury by EPA 1631? -
....ANSWER...Collect in fluoropolymer bottle and preserve
with HCl within 48 hours.
Alkalinity - Bottle, Preservation, Hold Time -
....ANSWER...250mL plastic/glass, unpres, 14 days
1,4 Dioxane - Bottle, Preservation, Hold Time -
....ANSWER...500ml amber, sulfite/bisulfate, 28 days
2
,Ammonia - Bottle, Preservation, Hold Time -
....ANSWER...500ml plastic/glass, pH<2 H2SO4, 28 days
BNAS - Bottle, Preservation, Hold Time -
....ANSWER...1L amber glass, sod thiosulfate, 7 days
BOD / cBOD - Bottle, Preservation, Hold Time -
....ANSWER...1L plastic/glass, unpreserved, 48 hr
Metals - Bottle, Preservation, Hold Time -
....ANSWER...500ml plastic, HNO3 pH<2, 6 mo
300.1 (Bromate, Chlorate, Chlorite) - Bottle, Preservation,
Hold Time - ....ANSWER...500ml plastic/glass, EDA, 28
days
300.0 + 300.1 (All Others)- Bottle, Preservation, Hold
Time - ....ANSWER...plastic/glass, unpres, 28 days
Chlorine Demand - Bottle, Preservation, Hold Time -
....ANSWER...amber, unpres, 24 hr
Chlorine, Total Residual - Bottle, Preservation, Hold Time
3
, - ....ANSWER...plastic/glass, unpres, 0.25hr
COD - Bottle, Preservation, Hold Time -
....ANSWER...plastic/glass, H2SO4 pH<2, 28 days
Color (Spec) - Bottle, Preservation, Hold Time -
....ANSWER...amber plastic/glass, unpres, 48 hr
Color (Vis) - Bottle, Preservation, Hold Time -
....ANSWER...amber plastic/glass, unpres, 24 hr
Cyanide - Bottle, Preservation, Hold Time -
....ANSWER...amber plastic/glass, absorbic
acid(dechlor) NaOH pH>11, 14 days
DOC - Bottle, Preservation, Hold Time -
....ANSWER...glass/voa, filter & pH<2 H3PO4, 28 days
HAA - Bottle, Preservation, Hold Time -
....ANSWER...amber glass, ammonium chloride, 14
days
4
