Talk about the analysis principle of the residual chlorine analyzer

The residual chlorine analyzer is composed of a total chlorine composite electrode, a display instrument, a reagent tablet and a standard sample cup, etc. It can simultaneously measure residual chlorine, pH value, temperature, and is widely used in industries such as electric power and water plants. The residual chlorine analyzer contains two measuring electrodes, HOCL electrode and temperature electrode. The HOCL electrode is a Clark-type current sensor manufactured using microelectronics technology and used to measure the concentration of hypochlorous acid (HOCl) in water. The sensor consists of three electrodes in a small electrochemical format, a working electrode (WE), a counter electrode (CE) and a reference electrode (RE). The method for measuring the concentration of hypochlorous acid (HOCl) in water is based on measuring the current change of the working electrode due to the change of the concentration of hypochlorous acid. (1) The reference electrode of the general potential sensor is usually a silver/silver chloride electrode, while the reference electrode of the total chlorine electrode is a crystal made of a compound material. In a solution with a constant potassium iodide concentration, the electrode potential can be kept constant. . (2) The indicator electrode of the general potentiometric sensor is directly sensitive to the measured object, while the platinum indicator electrode of the total chlorine electrode uses the oxidation property of total chlorine, which can quantitatively oxidize potassium iodide (KI) to iodine (I2), The platinum indicator potential changes with the change of iodine concentration, which indirectly indicates the change of chlorine concentration. (3) Since the temperature has a great influence on the measured potential, the measured potential must be corrected for temperature. Therefore, a temperature sensitive element is added to the total chlorine electrode. The principle of measuring total chlorine with the total chlorine electrode: the so-called total chlorine is the general term for free chlorine (Cl2), hypochlorite (OCl-) and nitrogen-containing compounds of chlorine (such as chloramine T) contained in the measured solution. The total chlorine electrode uses the oxidizing properties of these substances to react with potassium iodide (KI) to generate iodine (I2). The electrode potential of the platinum indicator electrode changes with the iodine concentration, obeying the Nernst equation, and the electrode potential of the crystal (reference electrode) also obeys the Nernst equation. The iodine concentration is related, and the potential reading displayed by the total chlorine electrode is related to the total chlorine concentration. After conversion, the ppm (1ppm=1mg/L) can be read directly on the display. Therefore, the total chlorine electrode does not directly respond to chlorine, but to the generated iodine, which is an indirect measurement method.

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