CWEA grade 1 lab analyst practice test part 3
BOD determination is an empirical test in which determine the relative oxygen requirements of waste waters, effluents, and
standardized lab procedures are used to: polluted waters
3 multiple choice options
What's the protocol for sample pretreatment for BOD? Assuring that the samples are neutralized to a pH range between 6.5 and 7.5
and any residual chlorine has been dechlorinated
3 multiple choice options
What is disinfection? Process designed to kill most microorganisms in wastewater, including all
essentially pathogenic bacteria
2 multiple choice options
What is fecal coliform bacteria? Bacteria found in the feces of warm-blooded animals
2 multiple choice options
What is the Total coliform group? All the aerobic and facultative anaerobic, gram-negative, non-spore-forming,
rod-shaped bacteria that ferment the lactose in 24-48 hours at 35 degrees C
3 multiple choice options
Lab test results for an individual environmental sample A known error has occurred
within an analytical batch may be rejected when: 2 multiple choice options
How is precision measured? Analyzing replicate samples
1 multiple choice option
What is Accuracy? The combination of bias and precision of an analytical procedure, which
reflects the closeness of a measured value to a true value
2 multiple choice options
What is Bias? Consistent deviation of measured values from the true value, caused by
systematic errors in a procedure
1 multiple choice option
What is Precision? Measures the degree of agreement among replicate analyses of a sample,
usually expressed as the standard deviation
2 multiple choice options
What is Random Error? Consistent deviation of measured values from the true value, caused by
systematic errors in a procedure
2 multiple choice options
BOD determination is an empirical test in which determine the relative oxygen requirements of waste waters, effluents, and
standardized lab procedures are used to: polluted waters
3 multiple choice options
What's the protocol for sample pretreatment for BOD? Assuring that the samples are neutralized to a pH range between 6.5 and 7.5
and any residual chlorine has been dechlorinated
3 multiple choice options
What is disinfection? Process designed to kill most microorganisms in wastewater, including all
essentially pathogenic bacteria
2 multiple choice options
What is fecal coliform bacteria? Bacteria found in the feces of warm-blooded animals
2 multiple choice options
What is the Total coliform group? All the aerobic and facultative anaerobic, gram-negative, non-spore-forming,
rod-shaped bacteria that ferment the lactose in 24-48 hours at 35 degrees C
3 multiple choice options
Lab test results for an individual environmental sample A known error has occurred
within an analytical batch may be rejected when: 2 multiple choice options
How is precision measured? Analyzing replicate samples
1 multiple choice option
What is Accuracy? The combination of bias and precision of an analytical procedure, which
reflects the closeness of a measured value to a true value
2 multiple choice options
What is Bias? Consistent deviation of measured values from the true value, caused by
systematic errors in a procedure
1 multiple choice option
What is Precision? Measures the degree of agreement among replicate analyses of a sample,
usually expressed as the standard deviation
2 multiple choice options
What is Random Error? Consistent deviation of measured values from the true value, caused by
systematic errors in a procedure
2 multiple choice options
