Post on 27-Dec-2015
water
forensics
Let’s talk about “Water”
Charmlee
Yosemite
Yosemite
CharmleeFranklin Canyon
Ocean (Beach)
Our water sources are exposed to chemical and animal wastes – are we exposed to that, too?
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 waterBottled Water:
Tap Water:
Tastes Better?Is Cleaner?Is More Exotic?Comes in a Bottle
Is Cheaper
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 %
-----------------------------------------------------------------(The National Academic press, 2008)
Demo
TDS (TOTAL DISSOLVED SOLID)
CONDUCTIVITY
AMMONIACOPPERALKALINITYCHLORIDECHLORINENITRATEIRONHARDNESS
NAME:
PERIOD:
SAMPLE:
A
B
C
D
E
F
Period:
Location/ Source
Name: A B C D E F
TDS(ppt):
Conductivity (ms):
Alkalinity:
Ammonia:
Chloride:
Chlorine:
Copper:
Hardness:
Iron:
Nitrate:
1. Guess what A, B, C, D, E, and F are (Bottled water, Charmlee water, Franklin Canyon water, Tap water, and Yosemite water)
2. Evaluate why
A
B
C D
E
F
•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!!!