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CWEA GRADE 1 LAB ANALYST|2023/24 UPDATE|GRADED A+
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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 ar...

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  • August 29, 2023
  • 6
  • 2023/2024
  • Exam (elaborations)
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  • cwea grade 1 lab analyst202324 updategraded a

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CWEA GRADE 1 LAB ANALYST
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.
Who, ultimately, is responsible for establishing and enforcing a lab safety program?
The lab director.
What is the responsibility of the safety officer?
Make sure that PPE is available, periodic inspections of emergency equipment such as alarms,
fire extinguishers, eyewash and safety showers; periodic inspections of the lab to uncover
overlooked hazards, observe that personnel are following rules, remind others of safe practices.
What type of info should be included in a safety report?
who, what, when, where, what injuries (time and nature of accident is helpful). Only accidents
causing major injury is required to be reported to OSHA (Occupational Safety and Health Act).
What does the OSHA "Hazard Communication Standard" or "Right-to-Know Regulation" specify?
A method of employee notification about hazards in the workplace. Exposed personnel must be
educated on safe work practices and must be under direct supervision and observation by a
qualified individual. Personnel have the right to know of hazardous materials present, specific
hazards created by those materials, and required procedures to protect against the hazards.
Types of fire extinguishers
Type A: water-type extinguishers for ordinary combustibles such as wood, paper, rags
Type B: dry-chemical type extinguishers for flammable liquids and metals and electrical fires
Type C: Carbon dioxide types for flammable liquids and limited use around electronic
instrumentation and equipment
Type ABC: multipurpose fire extinguishers
How should flammable solvents be stored?

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