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CWEA grade 1 lab analyst practice test part 2
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CWEA grade 1 lab analyst practice test part 2CWEA grade 1 lab analyst practice test part 2CWEA grade 1 lab analyst practice test part 2
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CWEA grade 1 lab analyst practice test part 2What is chloride? - ANS Major anion found in many natural waters - Can impart salty
taste in H2O
What increases the concentration of chloride in wastewater? - ANS Chloride in human
diet and softeners flushed into sanitary sewer system
2 most prevalent methods of measuring chloride? - ANS argentometric and mercuric
nitrate
What is the Argentometric method? - ANS Titration of the sample with a standard
solution of silver nitrate (AgNO3) - Indicator: Chromate ions (CrO4) - End point: reddish
silver chromate
What is the Mercuric Nitrate method? - ANS Titration with standard mercuric nitrate
solution -pH must be adjusted between 2.3 and 2.8 - Indicator: Diphenyl carbazone -
End point: Change from blue to purple in the presence of mercury
Which of the following can be an Interference of the Mercuric Nitrate Method? - ANS
Sulfide, bromide, orthophosphate (over 30 ppm), and iodide
Why does the color change in water?
a. Presence of decaying vegetable matter
b. metal ions (ie. iron)
c. industrial and domestic pollution
d. All of the above - ANS d
How is color measured - ANS Measured using visual comparison method
What is the visual comparison method - ANS Sample compared to standards using
matching nessler tubes - Standards prepared with solution containing chloroplatinate
and cobaltous chlorid
What is the standard unit for color? - ANS One unit= color resulting from 1 mg of
platinum/L
What is 2-color reporting? - ANS True and Apparent
Define True color - ANS Color from suspended solids, determine using sample treated
to remove turbidity
What is Apparent Color? - ANS Color from both dissolved and suspended solids
What is Conductivity? - ANS H2O capability to pass electrical flow
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