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A New Setup for the Measurement of Total Organic Carbon in Ultrapure Water Systems

  • With the increasing demand for ultrapure water in the pharmaceutical and semiconductor industry, the need for precise measuring instruments for those applications is also growing. One critical parameter of water quality is the amount of total organic carbon (TOC). This work presents a system that uses the advantage of the increased oxidation power achieved with UV/O3 advanced oxidation process (AOP) for TOC measurement in combination with a significant miniaturization compared to the state of the art. The miniaturization is achieved by using polymer-electrolyte membrane (PEM) electrolysis cells for ozone generation in combination with UV-LEDs for irradiation of the measuring solution, as both components are significantly smaller than standard equipment. Conductivity measurement after oxidation is the measuring principle and measurements were carried out in the TOC range between 10 and 1000 ppb TOC. The suitability of the system for TOC measurement is demonstrated using the oxidation by ozonation combined with UV irradiation of defined concentrations of isopropyl alcohol (IPA).

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Document Type:Article
Author:Sara H. Schäfer, Katharina van Dyk, Johannes Warmer, Torsten C. Schmidt, Peter Kaul
Parent Title (English):Sensors
Article Number:2004
Number of pages:11
Publishing Institution:Hochschule Bonn-Rhein-Sieg
Date of first publication:2022/03/04
Funding:The results of this study were obtained within a funded research project financed by the Ministry of Economic Affairs and Energy as ZIM-project under the funding code KF2130904RH4.
Keyword:AOP; O3/UV; TOC; ozonation; ultrapure water
Departments, institutes and facilities:Fachbereich Angewandte Naturwissenschaften
Institut für Sicherheitsforschung (ISF)
Dewey Decimal Classification (DDC):6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 628 Sanitär- und Kommunaltechnik; Umwelttechnik
Open access funding:Hochschule Bonn-Rhein-Sieg / Graduierteninstitut
Entry in this database:2022/03/09
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International