Online alkali solution monitoring instrument

Hello, regarding your question, I can provide the following methods for your reference: 1. pH value testing method: The concentration can be determined by measuring the changes in the pH value of the sodium hydroxide solution. During the process of sodium hydroxide solution absorbing chlorine to form sodium hypochlorite solution, as the amount of sodium hydroxide consumed increases, the pH value gradually decreases. Real-time monitoring can be carried out using a pH meter or a pH electrode. 2. Conductivity measurement method: The conductivity of sodium hydroxide solution is directly proportional to its concentration, and a conductivity meter can be used to monitor changes in the concentration of this solution. 3. UV-Vis spectroscopy detection: Sodium hypochlorite exhibits distinct absorption peaks in the UV-Vis spectrum. By measuring the intensity and wavelength of these absorption peaks in the resulting sodium hypochlorite solution, the concentration of sodium hydroxide can be calculated. The above are some of the more commonly used testing methods; the appropriate one should be selected based on the actual circumstances. It is also recommended to communicate with the instrument manufacturers and provide detailed sample information, so that they can offer more accurate testing solutions. .

You’re welcome; feel free to ask if you have any questions. .

Are there any other testing methods? Can ORP be measured?

ORP is the abbreviation for oxidation-reduction potential, which refers to a stable potential difference that is established at the surface of an electrode, between the electrode and the electrolyte. Generally, ORP is mainly used to monitor redox reactions in solutions. Regarding your question, I believe ORP is not the best testing method, as it does not directly reflect changes in sodium hydroxide concentration; instead, it only measures the redox capacity. In addition to the testing methods mentioned above, there are some other methods that can be tried, such as colorimetry and infrared spectroscopy. The applicability and feasibility of these methods need to be evaluated based on specific experimental conditions. It is recommended that you first determine the experimental requirements and conditions before selecting the appropriate testing method. .

This post was last edited by qugd on 2023-5-7 at 10:01. It is not practical to directly measure the alkalinity of such an alkaline solution that contains hypochlorite ions and chloride ions online. Regarding the method mentioned by Haiyou on the 2nd floor, I don’t know what basis it is based on Especially the first two analytical methods; they’re basically like trying to catch fish in trees. As for ultraviolet absorption, are there any spectral data available for the analysis of hypochlorite ions in the presence of a large amount of chloride ions that could serve as a reference? When the chloride ion concentration is high, its ultraviolet absorption is very significant. Returning to the original poster’s question: you may refer to the methods used in laboratories to measure the free alkalinity of sodium hypochlorite. Also, ask Jiangsu Yimai Technology whether they can customize an analyzer specifically to address your problem The general manager in charge of this analysis is highly proficient in chlor-alkali analysis; if it’s possible to carry out the analysis or if there are any questions, we can discuss them further.

After checking my sources, the analysis requirements outlined by the original poster can be met by the online analyzer produced by Jiangsu Yimai Technology; it uses acid-base titration, and before conducting the analysis, the analyzer automatically eliminates free chlorine and hypochlorite through chemical reactions in accordance with standard methods. You can consult Mr. Yu Wenjie, the CEO of Jiangsu Yimai Technology, for advice.

The detection method can be changed; other methods such as infrared spectroscopy, ultraviolet spectrophotometry, conductivity method, density method, and neutralization titration can be used. These methods differ from the electrode potential difference method; they are not affected by interferences generated during the reaction, thus enabling a more accurate measurement of the concentration of sodium hydroxide solution. Optimizing reaction conditions: By adjusting the conditions for the reaction between chlorine gas and sodium hydroxide, the composition of the solution after the reaction is made as simple and stable as possible, which facilitates the measurement of its concentration. For example, conditions such as the flow rate of chlorine gas, the concentration of the oxidizing agent, the reaction time, and the reaction temperature are controlled to ensure that the concentration of the sodium hypochlorite solution formed after the reaction is uniform and stable, and free from any other impurities.

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