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Electrical Conductivity Protocol. Goals for the Training Session. Provide an inquiry context for the data collection and science content Provide accurate science content Review procedures for instrument calibration Review procedures for data collection Review data entry and analysis

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Presentation Transcript
goals for the training session
Goals for the Training Session
  • Provide an inquiry context for the data collection and science content
  • Provide accurate science content
  • Review procedures for instrument calibration
  • Review procedures for data collection
  • Review data entry and analysis
  • Discuss classroom implementation ideas
  • Collect feedback from participants

Draft 2005

inquiry context
Inquiry Context
  • How does the electrical conductivity of water at the study site vary across seasons?
  • How does a rain event or snow melt affect conductivity?
  • What human activities can impact the conductivity of water at the study site?
  • What local water quality standards govern the use and management of local water sources?

Draft 2005

why do globe scientists use electrical conductivity measurements
Why do GLOBE scientists use electrical conductivity measurements?
  • To help determine the usability of fresh water for different purposes
    • Drinking
    • Agriculture
    • Industrial
  • To determine the overall loading of salts and other compounds dissolved in fresh water
    • Snow melt
    • Industrial runoff

Draft 2005

science content why measure electrical conductivity
Science Content: Why measure electrical conductivity?

Electrical Conductivityis an indirect measure for finding thetotal dissolved solidsin a water body.

Total Dissolved Solids (TDS) is the amount of mineral and salt impurities in the water.

Draft 2005

science content sources of dissolved solids
Science Content: Sources of Dissolved Solids
  • Fresh water has many impurities, salts and minerals dissolved in water
  • Sources of dissolved solids:
    • Rocks and soils
    • Runoff
    • Wastewater releases
  • Drinking water should be < 500 ppm
  • Agriculture uses should be <1200 ppm

Draft 2005

the measurements
The Measurements
  • Electrical Conductivity Meter Calibration
  • Water Temperature
  • Electrical Conductivity

Draft 2005

instruments electrical conductivity meter
Instruments: Electrical Conductivity Meter

measured in µS/cm or µmho/cm

Draft 2005

collecting data field lab guides data sheets
Collecting Data: Field/Lab Guides & Data Sheets

Field/Lab Guides:

  • Water Temperature Protocol Field Guide
  • Electrical Conductivity Calibration Field Guide
  • Electrical Conductivity Protocol Field Guide

Optional:

  • Collecting a Water Sample in a Bucket Field Guide
  • Bottling a Water Sample for Classroom Testing Field Guide

Data Sheets:

  • Hydrology Investigation Data Sheet

Draft 2005

collecting data calibrating the electrical conductivity meter
Collecting Data: Calibrating the Electrical Conductivity Meter
  • Pour standard solution (at~25 °C) in two containers
  • Rinse electrodes with distilled water, blot dry
  • Place meter in first container, 2-3 seconds
  • Remove meter, shake gently, and place in second container (Do not rinse with distilled water)
  • Stir gently and allow to stabilize
  • Adjust meter until it reads the correct value for the standard
  • Record value

Draft 2005

collecting data protocol
Collecting Data: Protocol
  • Record water temperature
  • Pour water sample into two containers (or measure in water body)
  • Rinse electrodes with distilled water, blot dry
  • Place meter in first container, 2-3 seconds
  • Remove meter, shake gently, and place in second
  • container, 1 minute (Do not rinse with distilled water)
  • Record value when stabilized
  • Repeat measurement with new sample water, twice
  • Average three measurements and check for accuracy

Draft 2005

enter data on the globe web site
Enter Data on the GLOBE Web Site

Step 1: Confirm that the Hydrology Study Site definition is completed

Step 2: Select “Hydrology Measurements” from the Hydrology data entry menu

Step 3: Enter date/UT time/select site

Step 4: Enter the “water state”, water temperature, and electrical conductivity measurements

Step 5: Confirm data entries on verification page, especially the Average Electrical Conductivity Value

Draft 2005

classroom implementation
Classroom Implementation
  • Inquiry
  • Curriculum/Standards Alignment
  • Assessment
  • Classroom Management

Draft 2005

getting started
Getting Started
  • The GLOBE Web site has information

http://www.globe.gov

  • GLOBE Help Desk is available to support you as you get started.
  • Get your students involved doing real science!

Draft 2005