CWEA grade 1 lab analyst practice test part 3 fc fc fc fc fc fc fc fc
1. The hardness determination by EDTA titration measures:: Calcium and magnesium
fc fc fc fc fc fc fc fc fc
2. The indicator for the hardness determination is:: Eriochrome BlackT
fc fc fc fc fc fc fc cf fc
3. EPA-acceptable primary standards for turbidity determination:: Formazin fc fc fc fc fc fc
4. BOD determination is an empirical test in which standardized lab proce-
fc fc fc fc fc fc fc fc fc fc
dures are used to:: determine the relative oxygen requirements of waste waters, effluents, and polluted wat
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ers
5. What's the protocol for sample pretreatment for BOD?: Assuring that the samples are neut
fc fc fc fc fc fc fc fc fc fc fc fc fc
ralized to a pH range between 6.5 and 7.5 and any residual chlorine has been dechlorinated
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
6. What is disinfection?: Process designed to kill most microorganisms in wastewater, including all essen-
fc fc fc fc fc fc fc fc fc fc fc fc fc
tially pathogenic bacteria
fc fc
7. What is fecal coliform bacteria?: Bacteria found in the feces of warm-blooded animals
fc fc fc fc fc fc fc fc fc fc fc fc
8. What is the Total coliform group?: All the aerobic and facultative anaerobic, gram-negative,
fc fc fc fc fc fc fc fc fc fc fc fc
non-spore-forming, rod-shaped bacteria that ferment the lactose in 24-48 hours at 35 degrees C fc fc fc fc fc fc fc fc fc fc fc fc fc
9. Lab test results for an individual environmental sample within an analytical bat
fc fc fc fc fc fc fc fc fc fc fc
ch may be rejected when:: A known error has occurred
fc fc fc fc fc fc fc fc fc
10. How is precision measured?: Analyzing replicate samples
fc fc fc fc fc fc
11. What is Accuracy?: The combination of bias and precision of an analytical procedure, which reflects the
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
closeness of a measured value to a true value
fc fc fc fc fc fc fc fc
12. What is Bias?: Consistent deviation of measured values from the true value, caused by systematic errors in a p
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc f c fc
rocedure
13. What is Precision?: Measures the degree of agreement among replicate analyses of a sample, usually exp
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ressed as the standard deviation
fc fc fc fc
14. What is Random Error?: Consistent deviation of measured values from the true value, caused by sys
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
tematic errors in a procedure fc fc fc fc
15. What are Total Solids?: Well mixed sample is evaporated in a weighed dish and dried to constant wei
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ght in an oven at 103-105 degrees C
fc fc fc fc fc fc fc
16. Preparing Total solids evaporating dish:: Ignite clean evaporating dish at 550 furnace for 1 hou
fc fc fc fc fc fc fc fc fc fc fc fc fc fc
r and store and cool in desicator
fc fc fc fc fc fc
17. What is the Analysis procedure for total solids?: Step1.Chooseasamplevolumethatwill yield
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
residue between 2.5 and 200 mg, Step 2. Dry evaporated sample for 1 hour in 103-105 degrees C oven, Step
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
3. Cool in a desiccator and weigh to constant weight
fc fc fc fc fc fc fc fc fc
1fc/fc6
, CWEA grade 1 lab analyst practice test part 3 fc fc fc fc fc fc fc fc
18. What should the constant weight for total solids be?: Weight changeislessthan 4% of pre
fc fc fc fc fc fc fc fc fc fc fc cf fc fc fc fc
vious weight or 0.5 mg fc fc fc fc
19. What are Total Dissolved Solids?: A well- fc fc fc fc fc fc
mixed sample is filtered through a standard glass fiber filter and the filtrate is evaporated to dryness in a weigh
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ed dish and dried to constant weight at 180 degrees C
fc fc fc fc fc fc fc fc fc fc
20. How do you prepare a glass fiber filter disk?: Apply vacuum and wash disk with 3 successive 20 mL
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc f
volumes of reagent-grade water (Deionized Water)
c fc fc fc fc fc
21. How do you prepare an evaporating dish for TDS and Volatile solids?: For
f c f c f c f c f c f c f c f c f c f c f c f c fc
volatile solids, Ignite the cleaned evaporating dish at 550 for 1 hour in a furnace. For TDS, heat the cleaned dish to 180 for
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc f
1 hour
c fc
22. What is the Analysis procedure for total dissolved solids?: Step 1. Stir the sample
fc fc fc fc fc fc fc fc fc fc fc fc fc
with a magnetic stirrer and pipet the measured volume onto a glass fiber filter with an applied vacuum, Step 2. Wash with 3 suc
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
cessive 10 ml volumes of reagent-grade water, Step 3. Suction for 3 minutes after filtration is complete, Step
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
4. Transfer the total filtrate to a weighed evaporating dish and evaporate to dryness, Step 5. Dry evaporated sample for 1 ho
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ur at 180 +/- 2 degrees C Step 6. Cool and weigh to a constant weight
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
23. What are Total Suspended Solids?: A well-mixed sample is filtered through a weighed standard
fc fc fc fc fc fc fc fc fc fc fc fc fc
glass fiber filter and the residue retained is dried to constant weight at 103-105 degrees C
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
24. What is the Analysis procedure for total suspended solids?: Step1.Wetthefilter to seat i
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
t, Step 2. Pipet measured volume to filter, Step 3. Wash the filter with 3 successive 10 mL washes of reagent-
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
grade water and continue suction for 3 minutes, Step 4. Dry for 1 hour in a 103-
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
105 degree C oven, Step 5. Cool in a desiccator and weigh until constant weight
fc fc fc fc fc fc fc fc fc fc fc fc fc fc
25. Coliform density using fermentation techniques can be estimated using:: A pro fc fc fc fc fc fc fc fc fc fc
bable number table fc fc
26. How do you make a drinking water setup?: 10 replicate tubes, each containing 10 mL or 5 replic
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ate tubes containing 20 mL
fc fc fc fc
27. What is the objective of a total coliform test?: Determine the eflciency of treatment plant oper
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ations and integrity of the distribution system
fc fc fc fc fc fc
28. How do you use Non-potable water for multiple- fc fc fc fc fc fc fc
tube fermentation?: Inoculate a series of tubes with appropriate decimal dilutions of water (multiples of
fc fc f c fc fc fc fc fc fc fc fc fc fc fc fc
10 mL) fc
29. Which of the following is the presumptive phase of the Standard total colifof c f c f c f c f c f c f c f c f c f c f c fc
rm fermentation technique?: Use lauryl tryptose broth. Add dehydrated ingredients, mix, and heat to diss
fc fc fc fc fc fc fc fc fc fc fc fc fc fc
2fc/fc6
1. The hardness determination by EDTA titration measures:: Calcium and magnesium
fc fc fc fc fc fc fc fc fc
2. The indicator for the hardness determination is:: Eriochrome BlackT
fc fc fc fc fc fc fc cf fc
3. EPA-acceptable primary standards for turbidity determination:: Formazin fc fc fc fc fc fc
4. BOD determination is an empirical test in which standardized lab proce-
fc fc fc fc fc fc fc fc fc fc
dures are used to:: determine the relative oxygen requirements of waste waters, effluents, and polluted wat
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ers
5. What's the protocol for sample pretreatment for BOD?: Assuring that the samples are neut
fc fc fc fc fc fc fc fc fc fc fc fc fc
ralized to a pH range between 6.5 and 7.5 and any residual chlorine has been dechlorinated
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
6. What is disinfection?: Process designed to kill most microorganisms in wastewater, including all essen-
fc fc fc fc fc fc fc fc fc fc fc fc fc
tially pathogenic bacteria
fc fc
7. What is fecal coliform bacteria?: Bacteria found in the feces of warm-blooded animals
fc fc fc fc fc fc fc fc fc fc fc fc
8. What is the Total coliform group?: All the aerobic and facultative anaerobic, gram-negative,
fc fc fc fc fc fc fc fc fc fc fc fc
non-spore-forming, rod-shaped bacteria that ferment the lactose in 24-48 hours at 35 degrees C fc fc fc fc fc fc fc fc fc fc fc fc fc
9. Lab test results for an individual environmental sample within an analytical bat
fc fc fc fc fc fc fc fc fc fc fc
ch may be rejected when:: A known error has occurred
fc fc fc fc fc fc fc fc fc
10. How is precision measured?: Analyzing replicate samples
fc fc fc fc fc fc
11. What is Accuracy?: The combination of bias and precision of an analytical procedure, which reflects the
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
closeness of a measured value to a true value
fc fc fc fc fc fc fc fc
12. What is Bias?: Consistent deviation of measured values from the true value, caused by systematic errors in a p
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc f c fc
rocedure
13. What is Precision?: Measures the degree of agreement among replicate analyses of a sample, usually exp
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ressed as the standard deviation
fc fc fc fc
14. What is Random Error?: Consistent deviation of measured values from the true value, caused by sys
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
tematic errors in a procedure fc fc fc fc
15. What are Total Solids?: Well mixed sample is evaporated in a weighed dish and dried to constant wei
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ght in an oven at 103-105 degrees C
fc fc fc fc fc fc fc
16. Preparing Total solids evaporating dish:: Ignite clean evaporating dish at 550 furnace for 1 hou
fc fc fc fc fc fc fc fc fc fc fc fc fc fc
r and store and cool in desicator
fc fc fc fc fc fc
17. What is the Analysis procedure for total solids?: Step1.Chooseasamplevolumethatwill yield
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
residue between 2.5 and 200 mg, Step 2. Dry evaporated sample for 1 hour in 103-105 degrees C oven, Step
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
3. Cool in a desiccator and weigh to constant weight
fc fc fc fc fc fc fc fc fc
1fc/fc6
, CWEA grade 1 lab analyst practice test part 3 fc fc fc fc fc fc fc fc
18. What should the constant weight for total solids be?: Weight changeislessthan 4% of pre
fc fc fc fc fc fc fc fc fc fc fc cf fc fc fc fc
vious weight or 0.5 mg fc fc fc fc
19. What are Total Dissolved Solids?: A well- fc fc fc fc fc fc
mixed sample is filtered through a standard glass fiber filter and the filtrate is evaporated to dryness in a weigh
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ed dish and dried to constant weight at 180 degrees C
fc fc fc fc fc fc fc fc fc fc
20. How do you prepare a glass fiber filter disk?: Apply vacuum and wash disk with 3 successive 20 mL
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc f
volumes of reagent-grade water (Deionized Water)
c fc fc fc fc fc
21. How do you prepare an evaporating dish for TDS and Volatile solids?: For
f c f c f c f c f c f c f c f c f c f c f c f c fc
volatile solids, Ignite the cleaned evaporating dish at 550 for 1 hour in a furnace. For TDS, heat the cleaned dish to 180 for
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc f
1 hour
c fc
22. What is the Analysis procedure for total dissolved solids?: Step 1. Stir the sample
fc fc fc fc fc fc fc fc fc fc fc fc fc
with a magnetic stirrer and pipet the measured volume onto a glass fiber filter with an applied vacuum, Step 2. Wash with 3 suc
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
cessive 10 ml volumes of reagent-grade water, Step 3. Suction for 3 minutes after filtration is complete, Step
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
4. Transfer the total filtrate to a weighed evaporating dish and evaporate to dryness, Step 5. Dry evaporated sample for 1 ho
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ur at 180 +/- 2 degrees C Step 6. Cool and weigh to a constant weight
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
23. What are Total Suspended Solids?: A well-mixed sample is filtered through a weighed standard
fc fc fc fc fc fc fc fc fc fc fc fc fc
glass fiber filter and the residue retained is dried to constant weight at 103-105 degrees C
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
24. What is the Analysis procedure for total suspended solids?: Step1.Wetthefilter to seat i
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
t, Step 2. Pipet measured volume to filter, Step 3. Wash the filter with 3 successive 10 mL washes of reagent-
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
grade water and continue suction for 3 minutes, Step 4. Dry for 1 hour in a 103-
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
105 degree C oven, Step 5. Cool in a desiccator and weigh until constant weight
fc fc fc fc fc fc fc fc fc fc fc fc fc fc
25. Coliform density using fermentation techniques can be estimated using:: A pro fc fc fc fc fc fc fc fc fc fc
bable number table fc fc
26. How do you make a drinking water setup?: 10 replicate tubes, each containing 10 mL or 5 replic
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ate tubes containing 20 mL
fc fc fc fc
27. What is the objective of a total coliform test?: Determine the eflciency of treatment plant oper
fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ations and integrity of the distribution system
fc fc fc fc fc fc
28. How do you use Non-potable water for multiple- fc fc fc fc fc fc fc
tube fermentation?: Inoculate a series of tubes with appropriate decimal dilutions of water (multiples of
fc fc f c fc fc fc fc fc fc fc fc fc fc fc fc
10 mL) fc
29. Which of the following is the presumptive phase of the Standard total colifof c f c f c f c f c f c f c f c f c f c f c fc
rm fermentation technique?: Use lauryl tryptose broth. Add dehydrated ingredients, mix, and heat to diss
fc fc fc fc fc fc fc fc fc fc fc fc fc fc
2fc/fc6
