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AALSO - WQ

Terms in this set (25)

Salinity is commonly measured using which unit?
ppt
How would you prepare 100 mL of 0.0400 M KCl from 0.200M KCl stock solution?
Withdraw 20.0 mL of 0.200 M KCl, place it in a partially filled 100 mL volumetric flask and add water until the final volume is 100 mL.
Which of the following is not considered Laboratory Personal Protective Equipment (PPE)?
Hair Tie
Which of the following is a concern after a chemical spill?

Environmental release
Adequate engineering controls or PPE to protect staff during cleanup
Slip or Trip Hazard
All of these
All of these
Where should flammable liquids be stored?
In an approved flammable liquid storage cabinet
If a water quality laboratory technician records data incorrectly, how should they respond?
Draw a single line through the entry making sure that the inaccurate information is still legible. Initial and date the entry. State the reason for the error. Document the correct information.
Why should you never add water to acid?
The exothermic reaction could possibly splash the content (acid) out of the container.
Which of the following is not a disinfection byproduct of chlorine disinfection?
Sodium hypochlorite
What is an alternative way to indirectly measure the amount of dissolved ozone in an aquarium?
DPD test for chlorine or bromine
Which of the following disinfection methods has a low potential for creating disinfection byproducts?
UV
What is the best definition of alkalinity?
The measurement of the pH buffering capacity in water
A solution with a pH of 7 is considered to be:
Neutral
13. List, in order of nitrification, the major compounds associated with the nitrogen cycle as it pertains to aquatic system health.
Ammonia, Nitrite, Nitrate
Which of the following is true about NH3-N?
The NH3-N form uses the molecular weight of only the nitrogen atoms
Which of the following do not contribute to Conductivity/Salinity?
Oxygen
What wavelength is considered part of the Visible Spectrum?
500 nm
How do you read the volume on a graduated Cylinder?
The volume is marked at the bottom of the meniscus
When analyzing ammonia, a technician analyzed spiked a sample containing 0.05 ppm ammonia as N with a standard, adding 0.10 ppm ammonia as N. When she reads the value of her LFM on the spectrophotometer, she sees a result of 0.05 ppm. Her LFB was spiked with 0.10 ppm ammonia as N and her result was 0.09 ppm ammonia as N. What corrective action is appropriate?
Re-prepare LFM and if it still fails, consider using a different method
The veterinary staff indicated an elevated presence of goiters in your saltwater fish tank. They indicated that this is due to the reduced amount of iodine in the water. What could be the cause of the problem?
Ozonation disinfection
When a measurement is repeatable and consistent it is said to have:
High Precision
Which of the following errors can be traced to defective equipment?
Systematic Errors
A freshwater system with a carbon filter is tested weekly for chlorine, with a normal result of 1.0ppm pre-filter and n/d post-filter. A DPD test today shows a value of 0.8ppm post-filter. After performing a retest and getting a similar result, what is the next thing you should do?
Check the date the carbon in the filter was last changed
SDS is short for:
Safety Data Sheets
What is the preferred glassware to use when doing a dilution?
Volumetric Flask
What should be added to a sample taken from a chlorinated mammal pool for coliform testing?
Sodium thiosulfate
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