The end of the peek tube is set to
have 1 cm space above the Teflon plane. The liquid drop of
sample, having a volume of 25mL, would move due to gravity
force along this hydrophobic tape to the electrode system and
would attach, due to adhesive force of aqueous drop and hydrophilic surface of glass, to the end of hydrophilic surface of
disposable glass dropper of the auxiliary electrode which is set
2 mm above Teflon tape