What is it about?
I have used an ordinary 6B pencil to draw a carbon working electrode on to a plastic substrate to make a sensor for ppb levels of lead (Pb).
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Why is it important?
This is a very simple and cheap method to make electrodes and sensors. I have shown it possible to use these to determine ppb levels of lead in environmental water.
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This page is a summary of: The voltammetric behaviour of lead at a hand drawn pencil electrode and its trace determination in water by stripping voltammetry, Analytical Methods, January 2015, Royal Society of Chemistry,
DOI: 10.1039/c4ay02987a.
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