Grade 1 Lab Analyst Exam with accurate detailed answers
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Define reagent grade water
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Water with no detectable concentration of compound or element to be analyzed i.e it is below the
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method's detection level. || ||
What is osmosis?
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The net movement of water through a semipermeable membrane towards an area of higher solute
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concentration.
What are the various ways reagent grade water is prepared?
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Distillation, reverse osmosis, ion exchange, carbon adsorption, filtration, ultrafiltration,
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ultraviolet oxidation. ||
Standard Methods is a compilation of approved methods by which agency?
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The EPA.
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What is accuracy?
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How close a measurement is to a known value
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What is precision?
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How close measurements are to each other
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, Define standard deviation. || ||
The amount of variation in measurements
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What is a mean? A median? || || || || ||
The mean is the average. The median is the middle number.
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Why is pH important in biological wastewater treatment?
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pH is important because microorganisms can only remain sufficiently active in a narrow pH range
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between 6.5 and 8. Outside of this range pH can inhibit or stop biological activity.
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What is the pH of typical raw wastewater? What does a departure from this pH indicate?
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pH of 7. Significant departures may indicate industrial or other non domestic discharges.
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What can low pH coupled with other observations such as sulfide odors and black color indicate?
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This can indicate septic reactions in the collection system or within the treatment process. Also,
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nitrification reactions in the secondary aeration basins may reduce pH enough to inhibit biological
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activity in some low-alkalinity systems.
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What is alkalinity and why is it important in wastewater treatment? How is it reported?
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Alkalinity is a measure of the ability of wastewater to neutralize acid. It is important because the
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characteristics of raw wastewater supply can influence alkalinity and contribute to hard water || || || || || || || || || || || || ||
(high alkalinity) or soft water (low alkalinity). It is measured in mg/L CaCO3.
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Define reagent grade water
|| || ||
Water with no detectable concentration of compound or element to be analyzed i.e it is below the
|| || || || || || || || || || || || || || || || ||
method's detection level. || ||
What is osmosis?
|| ||
The net movement of water through a semipermeable membrane towards an area of higher solute
|| || || || || || || || || || || || || || ||
concentration.
What are the various ways reagent grade water is prepared?
|| || || || || || || || ||
Distillation, reverse osmosis, ion exchange, carbon adsorption, filtration, ultrafiltration,
|| || || || || || || || ||
ultraviolet oxidation. ||
Standard Methods is a compilation of approved methods by which agency?
|| || || || || || || || || ||
The EPA.
||
What is accuracy?
|| ||
How close a measurement is to a known value
|| || || || || || || ||
What is precision?
|| ||
How close measurements are to each other
|| || || || || ||
, Define standard deviation. || ||
The amount of variation in measurements
|| || || || ||
What is a mean? A median? || || || || ||
The mean is the average. The median is the middle number.
|| || || || || || || || || ||
Why is pH important in biological wastewater treatment?
|| || || || || || ||
pH is important because microorganisms can only remain sufficiently active in a narrow pH range
|| || || || || || || || || || || || || ||
between 6.5 and 8. Outside of this range pH can inhibit or stop biological activity.
|| || || || || || || || || || || || || || ||
What is the pH of typical raw wastewater? What does a departure from this pH indicate?
|| || || || || || || || || || || || || || ||
pH of 7. Significant departures may indicate industrial or other non domestic discharges.
|| || || || || || || || || || || ||
What can low pH coupled with other observations such as sulfide odors and black color indicate?
|| || || || || || || || || || || || || || ||
This can indicate septic reactions in the collection system or within the treatment process. Also,
|| || || || || || || || || || || || || || ||
nitrification reactions in the secondary aeration basins may reduce pH enough to inhibit biological
|| || || || || || || || || || || || ||
activity in some low-alkalinity systems.
|| || || || ||
What is alkalinity and why is it important in wastewater treatment? How is it reported?
|| || || || || || || || || || || || || ||
Alkalinity is a measure of the ability of wastewater to neutralize acid. It is important because the
|| || || || || || || || || || || || || || || || ||
characteristics of raw wastewater supply can influence alkalinity and contribute to hard water || || || || || || || || || || || || ||
(high alkalinity) or soft water (low alkalinity). It is measured in mg/L CaCO3.
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