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36 Cards in this Set
- Front
- Back
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When combining acid and water, which goes into which? |
Acid goes into water |
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pH plays an important role in which water treatment processes? |
Coagulation Corrosion control Disinfection Softening |
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What chemicals used in water treatment will cause changes in alkalinity? |
Alum Lime Chlorine (ALC) |
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Which water quality indicators may change with time? |
Coliform bacteria Dissolved gases pH Residual chlorine Temperature |
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Hazardous materials in the lab include: |
Corrosive materials Explosive materials Flammable materials Toxic materials |
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When performing a coliform test using the MEMBRANE FILTER method, what do the letters CFU stand for? |
Colony formation unit |
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What problems are caused by hardness in water? |
Incrustaceans when water evaporates or scale when heated Formation of precipitates when combined with soap |
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What information should be recorded when a sample is collected? |
Sample location Date and time of collection Name of collector Who? Where? When? |
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What are the two types of samples collected by water treatment personnel? |
Grab samples Composite samples |
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The lead and copper rule calls for what types of samples? |
First draw or first flush |
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What are the principal hardness-causing ions in water? |
Calcium and magnesium |
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Why should sodium thiosulfate be added to coliform sample bottles? |
To neutralize any residual chlorine in the sample |
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MCL for copper |
1.3 mg/L at consumers tap |
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MCL for fluoride |
4.0 mg/L primary |
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MCL for lead |
0.015 mg/L at consumers tap |
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MCL for Mercury |
0.002 mg/L |
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MCL for total coliform |
1 per 100 mL Less than 40 samples/month-no more than 1 positive Greater than 40 samples/month-no more than 5% positive |
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MCL for Giardia |
3-log (99.9%) removal |
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MCL for Enteric viruses |
4-log (99.99%) removal |
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MCL for turbidity |
0.5 to 5 NTU |
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MCL for THMs |
0.080 mg/L "A THM is a DUI!" |
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MCL for color |
15 color units |
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MCL for fluoride |
2 mg/L secondary |
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What is the acceptable range for pH in drinking water? |
6.5-8.5 |
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What is a compound? |
A substance composed of two or more different elements and whose composition is constant |
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What are flasks used for? |
Containing and mixing chemicals (Just like booze) |
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What are beakers used for? |
Mixing and to measure approximate volumes Most common piece of laboratory equipment |
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What is a rule that pertains to volumetric flasks? |
Never to be heated |
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What are burets used for? |
To give accurate measurements of liquid volumes A Teflon stopcock never needs to be lubricated |
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What are graduated cylinders used for? |
To measure volumes of liquid with an accuracy less than berets but greater than beakers or flasks Never heat them |
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What should be kept handy to neutralize acids and bases? |
Vinegar and soda |
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Fires are classified as A, B, C, or D based on the type of material being consumed. Define these classifications |
A-ordinary combustibles B-flammable liquids and vapors C-energized electrical equipment D-combustible metals |
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From what part of the distribution system can you sample to get the truest evaluation of water? |
The main |
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What 2 water quality indicators require immediate analysis? |
Residual chlorine and temperature |
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What are the five alkalinity conditions possible in a water sample? |
Bicarbonate alone Bicarbonate and carbonate Carbonate alone Carbonate and hydroxide Hydroxide alone |
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What is superlative? |
Liquid removed from settled sludge |
