ABC Wastewater Level 3 Lab
Analyst Exam Questions with
Correct Solutions Already Graded
A+!!!Updated 2025/2026 New
Syllabus Exam Preparation
Material<<LATEST VERSION>>
Silver sulfate in COD analysis is used for what? - ANSWER ✓ as a catalyst
Potassium dichromate is an example of? - ANSWER ✓ an oxidizing agent
Nitric acid (NO3) is an? - ANSWER ✓ oxidizer
the tss lab procedure uses what type of filter? - ANSWER ✓ glass fiber
how do you check a manhole for leaks? - ANSWER ✓ check for gas coming out
of edges before opening
main concern with a chemical spill is what? - ANSWER ✓ clean up &
containment
Ammonia is released at what pH? - ANSWER ✓ > 11
What is digestion? - ANSWER ✓ decomposing a sample with high heat and acidic
conditions
What angle is light measured in a turbidity meter (nephelometer)? - ANSWER ✓
90 degree angle
On what type of sample can oil and grease can be analyzed? - ANSWER ✓ grab
, How often do you check eye wash and safety showers? - ANSWER ✓ in
intervals/monthly
What is the rule of acids and water? - ANSWER ✓ add acid to water slowly and
while stirring to disperse heat
digestion is the phosphorous test that produces what? - ANSWER ✓
orthophosphates
Jar test is for what? - ANSWER ✓ determining dosage of polymer for coagulation
and sedimentation
How is the multiple tube fermentation technique for fecal coliform performed? -
ANSWER ✓ EC medium at an incubation temperature of 44.5 +/- 2 degrees
celsius
How should chemicals be stored? - ANSWER ✓ in the appropriate container as
indicated
A single sample taken without considering time or flow is? - ANSWER ✓ a grab
What is added to a bacti bottle to remove chlorine? - ANSWER ✓ sodium
thiosulfate
A desiccator is used for what? - ANSWER ✓ to maintain a certain dryness (dry
environment)
What do you use when you make a standard? - ANSWER ✓ volumetric
flask/pipets
What term means killing pathogenic organisms? - ANSWER ✓ disinfection
What does MPN stand for? - ANSWER ✓ Most Probable number
What do you use before using pipets for phosphorous analysis? - ANSWER ✓
HCl
, When should sodium thiosulfate be added to the container for coliform samples? -
ANSWER ✓ before sterilization
What type of gloves are used in n-hexane analysis? - ANSWER ✓ nitrile
What is the correct method to prepare a total metals test after rinsing with tap
water? - ANSWER ✓ clean with nitric acid
How do you reunite a liquid column of a thermometer? - ANSWER ✓ dry ice -
alcohol slurry and store vertical for 24 hours
What happens in COD analysis when you homogenize the sample? - ANSWER ✓
you make it uniform/similar
What are waste management methods? - ANSWER ✓ the 3 "r"s - reduce, reuse,
and recycle
What document follows all samples from collection through reporting and is filed
with the test results? - ANSWER ✓ chain of custody
Why use a water bath to incubate fecal coliform? - ANSWER ✓ provides a
consistent temperature
how should BOD samples be set up? - ANSWER ✓ 60 mL BOD bottles or greater
Primary concern when buying buffers? - ANSWER ✓ shelf life/ expiration date
Meaning of TD & TC on glassware? - ANSWER ✓ TD = to deliver
TC = to contain
Pre treatment of distilled water is important why? - ANSWER ✓ minimize build
up on equipment
What kind of container is acceptable for an ammonia sample? - ANSWER ✓
plastic or glass
Bottles used for bacti sample collection should be ...? - ANSWER ✓ sterilized
Analyst Exam Questions with
Correct Solutions Already Graded
A+!!!Updated 2025/2026 New
Syllabus Exam Preparation
Material<<LATEST VERSION>>
Silver sulfate in COD analysis is used for what? - ANSWER ✓ as a catalyst
Potassium dichromate is an example of? - ANSWER ✓ an oxidizing agent
Nitric acid (NO3) is an? - ANSWER ✓ oxidizer
the tss lab procedure uses what type of filter? - ANSWER ✓ glass fiber
how do you check a manhole for leaks? - ANSWER ✓ check for gas coming out
of edges before opening
main concern with a chemical spill is what? - ANSWER ✓ clean up &
containment
Ammonia is released at what pH? - ANSWER ✓ > 11
What is digestion? - ANSWER ✓ decomposing a sample with high heat and acidic
conditions
What angle is light measured in a turbidity meter (nephelometer)? - ANSWER ✓
90 degree angle
On what type of sample can oil and grease can be analyzed? - ANSWER ✓ grab
, How often do you check eye wash and safety showers? - ANSWER ✓ in
intervals/monthly
What is the rule of acids and water? - ANSWER ✓ add acid to water slowly and
while stirring to disperse heat
digestion is the phosphorous test that produces what? - ANSWER ✓
orthophosphates
Jar test is for what? - ANSWER ✓ determining dosage of polymer for coagulation
and sedimentation
How is the multiple tube fermentation technique for fecal coliform performed? -
ANSWER ✓ EC medium at an incubation temperature of 44.5 +/- 2 degrees
celsius
How should chemicals be stored? - ANSWER ✓ in the appropriate container as
indicated
A single sample taken without considering time or flow is? - ANSWER ✓ a grab
What is added to a bacti bottle to remove chlorine? - ANSWER ✓ sodium
thiosulfate
A desiccator is used for what? - ANSWER ✓ to maintain a certain dryness (dry
environment)
What do you use when you make a standard? - ANSWER ✓ volumetric
flask/pipets
What term means killing pathogenic organisms? - ANSWER ✓ disinfection
What does MPN stand for? - ANSWER ✓ Most Probable number
What do you use before using pipets for phosphorous analysis? - ANSWER ✓
HCl
, When should sodium thiosulfate be added to the container for coliform samples? -
ANSWER ✓ before sterilization
What type of gloves are used in n-hexane analysis? - ANSWER ✓ nitrile
What is the correct method to prepare a total metals test after rinsing with tap
water? - ANSWER ✓ clean with nitric acid
How do you reunite a liquid column of a thermometer? - ANSWER ✓ dry ice -
alcohol slurry and store vertical for 24 hours
What happens in COD analysis when you homogenize the sample? - ANSWER ✓
you make it uniform/similar
What are waste management methods? - ANSWER ✓ the 3 "r"s - reduce, reuse,
and recycle
What document follows all samples from collection through reporting and is filed
with the test results? - ANSWER ✓ chain of custody
Why use a water bath to incubate fecal coliform? - ANSWER ✓ provides a
consistent temperature
how should BOD samples be set up? - ANSWER ✓ 60 mL BOD bottles or greater
Primary concern when buying buffers? - ANSWER ✓ shelf life/ expiration date
Meaning of TD & TC on glassware? - ANSWER ✓ TD = to deliver
TC = to contain
Pre treatment of distilled water is important why? - ANSWER ✓ minimize build
up on equipment
What kind of container is acceptable for an ammonia sample? - ANSWER ✓
plastic or glass
Bottles used for bacti sample collection should be ...? - ANSWER ✓ sterilized
