why mercury should be purified before use in polarographic technique ? Explain.
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The dropping mercury electrode (DME) is a working electrode made of mercury and used in polarography. ... Like other working electrodes these electrodes are used in electrochemical studies using three electrode systems when investigating reaction mechanisms related to redox chemistry among other chemical phenomena.
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Mercury is very dangerous means it is harmful to our body I think this may be one of the reason for your question
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