water

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water forensics
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Lets talk about Water
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Yosemite
Charmlee
Franklin Canyon
Ocean (Beach)
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Los Angeles water is super clean the LADWP is
doing their work! Contamination is less than 15
parts per billion by regulation Water can still
be contaminated between the plant and the
sink Old plumbing can deposit lead in your water
Our water sources are exposed to chemical and
animal wastes are we exposed to that, too?
Bottled Water
Tastes Better? Is Cleaner? Is More Exotic? Comes
in a Bottle
Tap Water
Is Cheaper
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• Human Consumption or Related Use 17.1
• Faucet use 15.7
• Dishwasher 1.4
• Human Contact Only 18.5
• Shower 16.8
• Bath 1.7
• Non-Human Ingestion or Contact Uses 64.3
• Toilet 26.7
• Clothes Washer 21.7
• Leaks 13.7
• Other 2.2
• --------------------------------------------------
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• (The National Academic press, 2008)

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Demo
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TDS (TOTAL DISSOLVED SOLID) CONDUCTIVITY AMMO
NIA COPPER ALKALINITY CHLORIDE CHLORINE NITRATE IR
ON HARDNESS
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NAME  
PERIOD  
SAMPLE  

A  
B  
C  
D  
E  
F  
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Period  

Location/ Source Name A B C D E F
TDS(ppt)            
Conductivity (ms)            
Alkalinity            
Ammonia            
Chloride            
Chlorine            
Copper            
Hardness            
Iron            
Nitrate            




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• Guess what A, B, C, D, E, and F are (Bottled
  water, Charmlee water, Franklin Canyon water, Tap
  water, and Yosemite water)
• Evaluate why
• A
• B
• C
•  
• D
• E
• F

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• Triple wash your tubes with the water (use very
  small amount) you are testing before you conduct
  your experiment.
• Triple wash your tubes with distilled water
  after each experiment
• No cross contamination Do not use same tube for
  different waters. Always use clean tubes.
• Do not eat the tablets!!!