Positions of the syringe ends, for the sample and that for the reagent should be arranged to be above the Teflon plane for 3–4 mm to let liquid drop freely. The path for the liquid drop moving should not be too long. In this experiment, it was about 5–10 cm.
The positions of the auxiliary and working electrodes would also affect the attachment of the liquid drop cell and effective surface area of the electrode for electrochemical generation of iodine. If the auxiliary electrode was arranged to be on the upper position relatively to working electrode, effective surface area of the working electrode was found to be better, since liquid drop cell prefers to attach to the hydrophilic glass body of auxiliary electrode.