Upload
rosamond-todd
View
220
Download
0
Tags:
Embed Size (px)
Citation preview
Liquid Conductivity
The creating and testing of a conductivity meter.
TEAM IPedro Guerrero
Roc-Quelle BarksdaleJamia Pugh
INTRODUCTION• Conductivity measures a
materials ability to conduct an electrical current. Its measured in µS/cm
• Conductivity is used to measure the amount of total dissolved solids (TDS) in water
• Environmental Protection Agency (EPA) limits a maximum of 500ppm of TDS for drinking water.
Making our Conductivity Meter
We built our own conductivity meter.
•Our meter: under $50
•Store bought: around $450
•Our meter is cheaper and portable.A B
Vernier Meter- $450 Our Meter- $50
Our purpose was to build an inexpensive, portable, working conductivity meter, without the expensive price. Our meter is 1/9 the price of a store
bought meter!
A B
Testing Our Meters…
Conductivity of pure water = 0
Things that affect conductivity Ion Concentration
A molecule does not have
same amount of protons
as electrons, giving it a
positive or negative charge.
Ion Concentration Affects Conductivity
AlCl3
CaCl2NaCl
Temperature affects the conductivity.
When temperature increases, conductivity increases.
WATER QUALITY • Samples of water were collected around
the Penn State area and were tested with our conductivity meters
• We took a field trip to the following water sources:
Because our devices were portable
• Whipple Dam
Spring Creek
Shavers Creek
RESULTS……….
A
Calculating TDS
• Conductivity can be calculated from the
reading on our meters using Ohm’s Law.• We calculated Spring Creek to have a
conductivity of 533µS/cm.• Then, by multiplying the conductivity by
0.75, then you can calculate total dissolved solids.
• This means the TDS is 400ppm. Below EPA ‘s limit.
BRITA FILTER• Every Brita Filter contains charcoal and
ion exchange resin (zeolites).
• Charcoal is used to remove the chlorine ions and some organic compounds.
• Zeolites are used to remove metal cations copper, zinc, mercury, and cadmium.
A B
TESTING
To test the zeolites and charcoal, we used an aluminum chloride solution.
Conclusion
• We built an inexpensive, portable, working conductivity meter.
• The meter is a good tool to use when trying to see if certain types of water meets EPA standards.
• It can also be used in high school labs because of the low cost and portability.
Special Thanks to…• Eberly College of Science
• Dr. Jackie Bortiatynski• Dr. Dan Sykes• Jody Markley• Derek James• Josh Harper
• Cole McDonald• Sean Haggerty• Matt Johnson• UBMS Staff
Questions?