CWEA grade 1 lab analyst practice test part 3 hb hb hb hb hb hb hb hb
1. The hardness determination by EDTA titration measures:: Calcium and magnesium
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2. The indicator for the hardness determination is:: Eriochrome Black T
hb hb hb hb hb hb hb hb hb
3. EPA-acceptable primary standards for turbidity determination:: Formazin hb hb hb hb hb hb
4. BOD determination is an empirical test in which standardized lab proce-
hb hb hb hb hb hb hb hb hb hb
dures are used to:: determine the relative oxygen requirements of waste waters, effluents, and polluted w
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
aters
5. What's the protocol for sample pretreatment for BOD?: Assuring that the samples are n
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eutralized to a pH range between 6.5 and 7.5 and any residual chlorine has been dechlorinated
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
6. What is disinfection?: Process designed to kill most microorganisms in wastewater, including all essen-
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tially pathogenic bacteria
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7. What is fecal coliform bacteria?: Bacteria found in the feces of warm-blooded animals
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8. What is the Total coliform group?: All the aerobic and facultative anaerobic, gram-negative,
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non-spore-forming, rod-shaped bacteria that ferment the lactose in 24-48 hours at 35 degrees C
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9. Lab test results for an individual environmental sample within an analytical
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batch may be rejected when:: A known error has occurred
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10. How is precision measured?: Analyzing replicate samples
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11. What is Accuracy?: The combination of bias and precision of an analytical procedure, which reflects the
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closeness of a measured value to a true value
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12. What is Bias?: Consistent deviation of measured values from the true value, caused by systematic errors in
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a procedure
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13. What is Precision?: Measures the degree of agreement among replicate analyses of a sample, usually e
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xpressed as the standard deviation
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14. What is Random Error?: Consistent deviation of measured values from the true value, caused by
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systematic errors in a procedure hb hb hb hb
15. What are Total Solids?: Well mixed sample is evaporated in a weighed dish and dried to constant
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weight in an oven at 103-105 degrees C
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16. Preparing Total solids evaporating dish:: Ignite clean evaporating dish at 550 furnace for 1 h
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our and store and cool in desicator
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17. What is the Analysis procedure for total solids?: Step 1. Choose a sample volume that will yie
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ld residue between 2.5 and 200 mg, Step 2. Dry evaporated sample for 1 hour in 103-105 degrees C oven, Step
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3. Cool in a desiccator and weigh to constant weight
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1hb/hb
7
, CWEA grade 1 lab analyst practice test part 3 hb hb hb hb hb hb hb hb
18. What should the constant weight for total solids be?: Weight change is less than 4% of
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previous weight or 0.5 mg hb hb hb hb
19. What are Total Dissolved Solids?: A well- hb hb hb hb hb hb
mixed sample is filtered through a standard glass fiber filter and the filtrate is evaporated to dryness in a wei
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ghed dish and dried to constant weight at 180 degrees C
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20. How do you prepare a glass fiber filter disk?: Apply vacuum and wash disk with 3 successive 20
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mL volumes of reagent-grade water (Deionized Water)
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21. How do you prepare an evaporating dish for TDS and Volatile solids?:
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For volatile solids, Ignite the cleaned evaporating dish at 550 for 1 hour in a furnace. For TDS, heat the cleaned dish t
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o 180 for 1 hour
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22. What is the Analysis procedure for total dissolved solids?: Step 1. Stir the sample
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with a magnetic stirrer and pipet the measured volume onto a glass fiber filter with an applied vacuum, Step 2. Wash with
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3 successive 10 ml volumes of reagent-grade water, Step 3. Suction for 3 minutes after filtration is complete, Step
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4. Transfer the total filtrate to a weighed evaporating dish and evaporate to dryness, Step 5. Dry evaporated sample for 1
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hour at 180 +/- 2 degrees C Step 6. Cool and weigh to a constant weight
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23. What are Total Suspended Solids?: A well-mixed sample is filtered through a weighed standard
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glass fiber filter and the residue retained is dried to constant weight at 103-105 degrees C
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
24. What is the Analysis procedure for total suspended solids?: Step 1. Wet the filter to se
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at it, Step 2. Pipet measured volume to filter, Step 3. Wash the filter with 3 successive 10 mL washes of reagent-
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grade water and continue suction for 3 minutes, Step 4. Dry for 1 hour in a 103-
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105 degree C oven, Step 5. Cool in a desiccator and weigh until constant weight
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25. Coliform density using fermentation techniques can be estimated using:: A p hb hb hb hb hb hb hb hb hb hb
robable number table hb hb
26. How do you make a drinking water setup?: 10 replicate tubes, each containing 10 mL or 5 r
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
eplicate tubes containing 20 mL hb hb hb hb
27. What is the objective of a total coliform test?: Determine the eflciency of treatment plant o
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
perations and integrity of the distribution system hb hb hb hb hb hb
28. How do you use Non-potable water for multiple- hb hb hb hb hb hb hb
tube fermentation?: Inoculate a series of tubes with appropriate decimal dilutions of water (multiples
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of 10 mL) hb hb
29. Which of the following is the presumptive phase of the Standard total co
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liform fermentation technique?: Use lauryl tryptose broth. Add dehydrated ingredients, mix, and heat
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2hb/hb
7
1. The hardness determination by EDTA titration measures:: Calcium and magnesium
hb hb hb hb hb hb hb hb hb
2. The indicator for the hardness determination is:: Eriochrome Black T
hb hb hb hb hb hb hb hb hb
3. EPA-acceptable primary standards for turbidity determination:: Formazin hb hb hb hb hb hb
4. BOD determination is an empirical test in which standardized lab proce-
hb hb hb hb hb hb hb hb hb hb
dures are used to:: determine the relative oxygen requirements of waste waters, effluents, and polluted w
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
aters
5. What's the protocol for sample pretreatment for BOD?: Assuring that the samples are n
hb hb hb hb hb hb hb hb hb hb hb hb hb
eutralized to a pH range between 6.5 and 7.5 and any residual chlorine has been dechlorinated
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
6. What is disinfection?: Process designed to kill most microorganisms in wastewater, including all essen-
hb hb hb hb hb hb hb hb hb hb hb hb hb
tially pathogenic bacteria
hb hb
7. What is fecal coliform bacteria?: Bacteria found in the feces of warm-blooded animals
hb hb hb hb hb hb hb hb hb hb hb hb
8. What is the Total coliform group?: All the aerobic and facultative anaerobic, gram-negative,
hb hb hb hb hb hb hb hb hb hb hb hb
non-spore-forming, rod-shaped bacteria that ferment the lactose in 24-48 hours at 35 degrees C
hb hb hb hb hb hb hb hb hb hb hb hb hb
9. Lab test results for an individual environmental sample within an analytical
hb hb hb hb hb hb hb hb hb hb hb
batch may be rejected when:: A known error has occurred
hb hb hb hb hb hb hb hb hb
10. How is precision measured?: Analyzing replicate samples
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11. What is Accuracy?: The combination of bias and precision of an analytical procedure, which reflects the
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
closeness of a measured value to a true value
hb hb hb hb hb hb hb hb
12. What is Bias?: Consistent deviation of measured values from the true value, caused by systematic errors in
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a procedure
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13. What is Precision?: Measures the degree of agreement among replicate analyses of a sample, usually e
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xpressed as the standard deviation
hb hb hb hb
14. What is Random Error?: Consistent deviation of measured values from the true value, caused by
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
systematic errors in a procedure hb hb hb hb
15. What are Total Solids?: Well mixed sample is evaporated in a weighed dish and dried to constant
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
weight in an oven at 103-105 degrees C
hb hb hb hb hb hb hb
16. Preparing Total solids evaporating dish:: Ignite clean evaporating dish at 550 furnace for 1 h
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our and store and cool in desicator
hb hb hb hb hb hb
17. What is the Analysis procedure for total solids?: Step 1. Choose a sample volume that will yie
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
ld residue between 2.5 and 200 mg, Step 2. Dry evaporated sample for 1 hour in 103-105 degrees C oven, Step
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
3. Cool in a desiccator and weigh to constant weight
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1hb/hb
7
, CWEA grade 1 lab analyst practice test part 3 hb hb hb hb hb hb hb hb
18. What should the constant weight for total solids be?: Weight change is less than 4% of
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previous weight or 0.5 mg hb hb hb hb
19. What are Total Dissolved Solids?: A well- hb hb hb hb hb hb
mixed sample is filtered through a standard glass fiber filter and the filtrate is evaporated to dryness in a wei
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
ghed dish and dried to constant weight at 180 degrees C
hb hb hb hb hb hb hb hb hb hb
20. How do you prepare a glass fiber filter disk?: Apply vacuum and wash disk with 3 successive 20
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb h
mL volumes of reagent-grade water (Deionized Water)
b hb hb hb hb hb hb
21. How do you prepare an evaporating dish for TDS and Volatile solids?:
h b h b h b h b h b h b h b h b h b h b h b h b
For volatile solids, Ignite the cleaned evaporating dish at 550 for 1 hour in a furnace. For TDS, heat the cleaned dish t
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
o 180 for 1 hour
hb hb hb hb
22. What is the Analysis procedure for total dissolved solids?: Step 1. Stir the sample
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with a magnetic stirrer and pipet the measured volume onto a glass fiber filter with an applied vacuum, Step 2. Wash with
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
3 successive 10 ml volumes of reagent-grade water, Step 3. Suction for 3 minutes after filtration is complete, Step
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4. Transfer the total filtrate to a weighed evaporating dish and evaporate to dryness, Step 5. Dry evaporated sample for 1
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hour at 180 +/- 2 degrees C Step 6. Cool and weigh to a constant weight
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
23. What are Total Suspended Solids?: A well-mixed sample is filtered through a weighed standard
hb hb hb hb hb hb hb hb hb hb hb hb hb
glass fiber filter and the residue retained is dried to constant weight at 103-105 degrees C
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
24. What is the Analysis procedure for total suspended solids?: Step 1. Wet the filter to se
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
at it, Step 2. Pipet measured volume to filter, Step 3. Wash the filter with 3 successive 10 mL washes of reagent-
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
grade water and continue suction for 3 minutes, Step 4. Dry for 1 hour in a 103-
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
105 degree C oven, Step 5. Cool in a desiccator and weigh until constant weight
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25. Coliform density using fermentation techniques can be estimated using:: A p hb hb hb hb hb hb hb hb hb hb
robable number table hb hb
26. How do you make a drinking water setup?: 10 replicate tubes, each containing 10 mL or 5 r
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
eplicate tubes containing 20 mL hb hb hb hb
27. What is the objective of a total coliform test?: Determine the eflciency of treatment plant o
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
perations and integrity of the distribution system hb hb hb hb hb hb
28. How do you use Non-potable water for multiple- hb hb hb hb hb hb hb
tube fermentation?: Inoculate a series of tubes with appropriate decimal dilutions of water (multiples
hb hb h b hb hb hb hb hb hb hb hb hb hb hb
of 10 mL) hb hb
29. Which of the following is the presumptive phase of the Standard total co
h b h b h b h b h b h b h b h b h b h b h b hb
liform fermentation technique?: Use lauryl tryptose broth. Add dehydrated ingredients, mix, and heat
hb hb hb hb hb hb hb hb hb hb hb hb h
2hb/hb
7
