Continuous Monitoring of Free Chlorine Level and pH Using an Array of Carbon Nanotube Chemiresistors.

ABSTRACT: Free chlorine (FC) is the most commonly used disinfectant in water treatment plants, both as a primary disinfectant for pathogen removal and as a secondary disinfectant to suppress pathogen growth in the distribution system. The "disinfectant power" is dependent on the concentration of FC as well as the pH of the water. Continuous monitoring of FC level and pH is crucial to ensure safe drinking water; however, currently used methods involve either frequent calibration or reagents. Here, an array of single-walled carbon nanotube (SWCNT) chemiresistors is demonstrated for the continuous monitoring of FC at different pHs. The SWCNT chemiresistors were noncovalently functionalized with cobalt phthalocyanine and anthraquinone. The array has been shown to differentiate FC concentrations ranging

SUBMITTER: Akbar MA 

PROVIDER: S-EPMC12268746 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature