An electrochemical device is invented to measure chemical oxygen demand (COD) in industrial waste water or sewage water. The device consists of an electrochemical processing unit and a probe. The probe has an anode, cathode and a reference electrode. The anode metal has single crystal with {111} crystal plane exposed to the testing solution. The organics present in the waste water is extracted with an organic solvent. A thin film of the extracted solution is exposed to the probe. A D.C voltage, in the range of 1-1500 mV is applied for a duration of 1-1000 picoseconds to the anode with respect to a reference electrode. The external current and anode potential are measured. The empirical data are extrapolated to equilibrium concentration of oxidisable organics present and exposed to crystal {111} plane. The redox data are converted to Chemical Oxygen Demand and displayed in terms of COD, mg/ltr.
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