COD electrochemical analyzers

Abstract

An electrochemical analyser of chemical oxygen demand is composed of sample feeding system of flowing injection mode analysing and detecting device, as well as data processing system. The analysing and detecting device applies three electrodes electrochemical system including operation electrode, reference electrode, inlet and outlet tube, top cover, bottom cover, and teflon film setting between two covers and having a notch at middle to form detection cell.

Description

technical field [0001] The invention relates to an analytical instrument for quickly detecting the chemical oxygen demand of water body, in particular to a detection device for rapidly measuring the chemical oxygen demand of water body by adopting electrochemical amperometry detection technology, which belongs to the field of analytical chemistry and sensor technology. Background technique [0002] Chemical Oxygen Demand (hereinafter referred to as COD) is the measurement of strong oxidants in water, such as Cr 2 o 7 2- , MnO 4 - The equivalent of oxygen required for the oxidation of an oxidized organic substance. Commonly used COD detection methods include permanganate index method and potassium dichromate oxidation method, so most of the instruments used to measure COD are those used in conventional titration analysis. In addition to the consumption of a large amount of concentrated sulfuric acid and expensive silver sulfate in the analysis proce...

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Problems solved by technology

These methods only improved the traditional methods in terms of detection methods, but there are still problems such as long digestion time, poor accuracy of measurement results, and easy to produce secondary pollution.

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