Analytical quality solid-state composite reference electrode manufactured by injection moulding
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An injection moulding method was used for fabricating solid-state reference electrodes (Ag/AgCl type) based on a polymer/inorganic salt composite. In this method, a silver/silver chloride wire was placed inside a mould into which the mixture of polymer and inorganic salt was injected. The obtained solid-state composite reference electrodes were extensively tested to study the influence of different parameters such as solution composition, the concentrations and mobility of ions and pH on the potential stability of the electrodes. These experiments revealed that the composite reference electrodes are insensitive to the matrix effect, have excellent potential readings stability and considerably reduced leakage of inorganic salt. The composite reference electrodes were compared favourably to high-quality commercial reference electrodes. It was concluded that the composite reference electrodes obtained by injection moulding are of analytical quality allowing for continuous, prolonged and intensive usage.
KeywordsPotentiometry Reference electrode Solid contact Maintenance-free sensor
The study was supported by the SalWe Research Program for IMO (Tekes—the Finnish Funding Agency for Technology and Innovation grant 648/10). The authors would like to thank Carl-Johan Wikman for his technical assistance with the injection moulding.
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