August 29, 2018
Keio University
Functional Water Foundation
HORIBA Advanced Techno, Co., Ltd.
Japan Science and Technology Agency (JST)
1. Highlights of this research
Conventional methods for measuring available chlorine concentration, such as absorptiometry and electrochemical measurement, have faced challenges in terms of real-time measurement and maintenance-free operation.
Leveraging the strengths of diamond electrodes, we have created an available chlorine concentration measurement system that is highly sensitive, enables real-time and maintenance-free measurement, and is unaffected by pH or temperature.
The system is expected to be applied in various fields, including hypochlorous acid water generators, sodium hypochlorite solution supply systems, purified water, tap water, swimming pools, bathtubs, and the food industry.
Professor Yasuaki Einaga of the Department of Chemistry, Faculty of Science and Technology at Keio University, has developed a highly sensitive available chlorine concentration sensor system capable of real-time measurement, in collaboration with the Functional Water Foundation (Shinagawa-ku, Tokyo; Chairman: Kunimoto Hotta) and HORIBA Advanced Techno, Co., Ltd. (Kyoto, Kyoto Prefecture; President: Dan Horiba).
This sensor system was developed to measure the available chlorine concentration in hypochlorous acid water and sodium hypochlorite solutions used for sterilizing food and cooking equipment, disinfecting swimming pools, and other applications. By leveraging the strengths of diamond electrodes, such as their "highly sensitive and real-time detection capabilities," the system features: (1) compatibility with a wide range of concentrations, including for tap water (0–2 ppm), hypochlorous acid water (0–100 ppm), and sodium hypochlorite solutions (0–1000 ppm); (2) real-time measurement capability; (3) no influence from solution pH; (4) no influence from solution temperature; (5) no need for regular maintenance of the electrode surface; and (6) automatic measurement and recording.
In fields such as public health, food, and medicine, the daily measurement and recording of available chlorine concentration are increasingly required for reliable hygiene management. This sensor system is expected to be useful in various fields in the future.
This sensor system will be presented at JST Fair 2018, to be held at Tokyo Big Sight from August 30 to 31, 2018.
For the full press release, please see below.