CWEA GRADE 1 LAB ANALYST PRACTICE TEST PART 4 |
QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED
ANSWERS | LATEST EXAM UPDATE
Which of the following best describes the interpretation for total coliform
and E coli for the enzyme-substrate test?
The presence of fluorescence is a positive test for E. coli. If the chromogen
intensifies, the sample is total-coliform positive.
What is a Grab sample?
Single samples collected at a specific spot at a site over a short period of time
(not to exceed 15 min)
A sample is in a person's custody if it is:
In the individual's physical possession, sight, secured and tampered proof by
that individual, or secured in an area restricted to authorized personnel
What should sample labels include?
Unique sample number, sample type, name of the collector, date and time of
collection, place of collection, and sample preservative
Sample seals should include
Sample number that is identical to sample label, collector's name, date and time
of sampling. Attach so it must be broken to open sample container.
Field log books should include:
Purpose of sampling, location of sampling point, name and address of field
contact, producer of material being sampled and address, type of sample,
method, date, and time of preservation
The chain of custody should include
Sample number, signature of collector, date, time, and address of collection,
sample type; sample preservation requirements; signatures of person involved in
the chain of possession, and inclusive dates and times of possession
The laboratory portion of the sample analysis request sheet should include
Name of the person receiving the sample, laboratory sample number, date of
sample receipt, condition of each sample, and determinations to be performed
, When should samples be delivered?
As soon as practicable after collection, typically within 2 days and have chain of
custody record
Procedure for receiving samples
Inspect condition, seal, and review label against chain of custody forms. Assign
lab number and log into log book or LIMS. Store in secure storage room.
What is the Sampling protocol for alkalinity?
Plastic, glass, fluoropolymer, cool to </= 6 C
What is the Sampling protocol for BOD?
Plastic, glass, fluoropolymer, cool to </= 6 C
What is the Sampling protocol for COD?
Plastic, glass, fluoropolymer, analyze ASAP, or add H2SO4 to pH <2, cool to
</= 6 C
What is the Sampling protocol for chloride?
Plastic, glass, fluoropolymer, no preservative required
What is the Sampling protocol for chlorine residual?
Plastic, glass, fluoropolymer, and analyze immediately (no preservative since
chlorine changes rapidly)
What is the Sampling protocol for Color?
Plastic, glass, cool </= 6 C
What is the Sample protocol for hardness?
Plastic, glass, fluoropolymer, no preservative required
Sample protocol for dissolved oxygen (electrode)
Glass, BOD bottle, analyze immediately
Sample protocol for pH
Plastic, glass, analyze immediately
Sample protocol for solids
Plastic, glass, cool </= 6 C
Concentration units for chemical and physical results:
QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED
ANSWERS | LATEST EXAM UPDATE
Which of the following best describes the interpretation for total coliform
and E coli for the enzyme-substrate test?
The presence of fluorescence is a positive test for E. coli. If the chromogen
intensifies, the sample is total-coliform positive.
What is a Grab sample?
Single samples collected at a specific spot at a site over a short period of time
(not to exceed 15 min)
A sample is in a person's custody if it is:
In the individual's physical possession, sight, secured and tampered proof by
that individual, or secured in an area restricted to authorized personnel
What should sample labels include?
Unique sample number, sample type, name of the collector, date and time of
collection, place of collection, and sample preservative
Sample seals should include
Sample number that is identical to sample label, collector's name, date and time
of sampling. Attach so it must be broken to open sample container.
Field log books should include:
Purpose of sampling, location of sampling point, name and address of field
contact, producer of material being sampled and address, type of sample,
method, date, and time of preservation
The chain of custody should include
Sample number, signature of collector, date, time, and address of collection,
sample type; sample preservation requirements; signatures of person involved in
the chain of possession, and inclusive dates and times of possession
The laboratory portion of the sample analysis request sheet should include
Name of the person receiving the sample, laboratory sample number, date of
sample receipt, condition of each sample, and determinations to be performed
, When should samples be delivered?
As soon as practicable after collection, typically within 2 days and have chain of
custody record
Procedure for receiving samples
Inspect condition, seal, and review label against chain of custody forms. Assign
lab number and log into log book or LIMS. Store in secure storage room.
What is the Sampling protocol for alkalinity?
Plastic, glass, fluoropolymer, cool to </= 6 C
What is the Sampling protocol for BOD?
Plastic, glass, fluoropolymer, cool to </= 6 C
What is the Sampling protocol for COD?
Plastic, glass, fluoropolymer, analyze ASAP, or add H2SO4 to pH <2, cool to
</= 6 C
What is the Sampling protocol for chloride?
Plastic, glass, fluoropolymer, no preservative required
What is the Sampling protocol for chlorine residual?
Plastic, glass, fluoropolymer, and analyze immediately (no preservative since
chlorine changes rapidly)
What is the Sampling protocol for Color?
Plastic, glass, cool </= 6 C
What is the Sample protocol for hardness?
Plastic, glass, fluoropolymer, no preservative required
Sample protocol for dissolved oxygen (electrode)
Glass, BOD bottle, analyze immediately
Sample protocol for pH
Plastic, glass, analyze immediately
Sample protocol for solids
Plastic, glass, cool </= 6 C
Concentration units for chemical and physical results:
