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Hand-Held Conductivity Meter and Probe for Small Volumes and Field Work
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Abstract
A portable conductivity meter and probe are described. They have a unique combination of features that permits use with small volumes in the laboratory or in the field. The probe consists of two graphite electrodes embedded in a rigid plastic tube with a diameter small enough to use in standard 13 x 100-mm test tubes. A moderately high-frequency ac source prevents electrode polarization in highly conductive samples. The output is a 10-element LED bar graph. The device thus provides 10 steps of resolution, sufficient for semiquantitative determination of conductivity in environmental water samples.
Keywords (Domain):
Environmental ChemistryKeywords (Subject):
ConductivityCiting Articles
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This article has been cited by 4 ACS Journal articles (4 most recent appear below).
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Frazier Nyasulu, Kelly Stevanov, and Rebecca BarlagJournal of Chemical Education2010 87 (12), 1364-1366Using a conductivity sensor, a temperature sensor, and a datalogger, fundamental factors that affect conductivity are explored. These factors are (i) concentration, (ii) temperature, (iii) ion charge, and (iv) size and or mass of anion. In addition, the ...
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Lydia T. Tien , Melonie A. Teichert and Dawn RickeyJournal of Chemical Education2007 84 (1), 175This study investigates the effectiveness of a Model–Observe–Reflect–Explain (MORE) laboratory module in prompting three different populations of general chemistry students (honors students at a research university, chemistry majors at a primarily ...
What Happens When Chemical Compounds Are Added to Water? An Introduction to the Model-Observe-Reflect-Explain (MORE) Thinking Frame
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Adam C. Mattox and Barbara A. Reisner , Dawn RickeyJournal of Chemical Education2006 83 (4), 622This article describes a laboratory module designed to help students understand how different compounds behave when they are dissolved in water. Students measure the conductivities of various aqueous solutions using handheld conductivity testers with LED ...
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- Received: August 03, 2009
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