Abstract: A linear array electrode is provided for use in a flowcell detector. The electrode includes an electrically conductive material grooved to form array elements. The conductive material is embedded in an electrically insulating embedment such that a surface of each array element is exposed. The electrode includes means for connecting the electrically conductive material to a source of electric potential.

Abstract: A mercury drop electrode for use in electrochemical experiments. The invention includes a reservoir for liquid mercury, a mercury drop capillary having upper and lower open ends and also having a chemically inert lower capillary tube portion and an electrically conductive upper capillary tube portion supported by the lower portion and in contact with the mercury in the reservoir, valve means including a valve stem having a seal at its lower end and a ferromagnetic portion at its upper end, a valve seat comprising the upper end of the upper portion of the capillary which acts in concert with the valve seal to close the valve, and actuating means operatively arranged to lift the valve seal form the seat to allow mercury to enter the capillary from the reservoir and to lower the seal to the seat to prevent mercury from entering the capillary from the reservoir.