PURELAB® flex Real time TOC System
Technical notes | 2019 | ELGA LabWaterInstrumentation
Total organic carbon (TOC) monitoring is critical for ensuring the organic purity of ultrapure water used in advanced analytical techniques such as HPLC and GC-MS. While resistivity measurements reliably track inorganic contaminants, TOC provides a universal indicator of organic impurities that can compromise the accuracy and sensitivity of trace-level analyses.
This note describes the design and performance evaluation of the PURELAB® flex real-time TOC system. The aim is to demonstrate its ability to detect transient organic contamination rapidly, compare its response with a competitive TOC monitor, and highlight its suitability for continuous, online water quality control.
Water flow from the PURELAB flex system passes through a UV-irradiation chamber where far-UV light oxidizes organic compounds to ionic species. Pre- and post-oxidation resistivity measurements determine the TOC concentration by the change in conductivity. Key components include:
Performance tests involved injecting 3 mL aliquots of 100 ppm methyl ethyl ketone into feedwater at different points in the measurement cycle and logging TOC readings continuously.
Comparative tests revealed that the PURELAB flex TOC monitor detects spikes in organic carbon within minutes regardless of injection timing. In contrast, the competitor’s monitor failed to register elevated TOC levels at the start of oxidation and exhibited significant delays when detecting contamination during the fill phase. Graphical data confirm the superior real-time response of the PURELAB flex system.
The rapid detection capability ensures that only water with verified low TOC is dispensed for sample preparation, safeguarding the integrity of demanding analytical workflows. Automated UV lamp efficiency checks and self-recalibration minimize maintenance downtime and maintain measurement accuracy over time.
Advances may include integration of multi-wavelength UV sources for improved oxidation efficiency across a broader range of organics, inline data analytics for predictive maintenance, and IoT connectivity for remote monitoring and control. Such developments will further strengthen quality assurance in pharmaceutical, semiconductor, and environmental laboratories.
The PURELAB flex real-time TOC system offers reliable, rapid monitoring of organic impurities in ultrapure water. Its superior response time and automated calibration features make it a valuable tool for laboratories requiring stringent water quality control.
Laboratory instruments
IndustriesOther
ManufacturerELGA LabWater
Summary
Importance of the Topic
Total organic carbon (TOC) monitoring is critical for ensuring the organic purity of ultrapure water used in advanced analytical techniques such as HPLC and GC-MS. While resistivity measurements reliably track inorganic contaminants, TOC provides a universal indicator of organic impurities that can compromise the accuracy and sensitivity of trace-level analyses.
Objectives and Study Overview
This note describes the design and performance evaluation of the PURELAB® flex real-time TOC system. The aim is to demonstrate its ability to detect transient organic contamination rapidly, compare its response with a competitive TOC monitor, and highlight its suitability for continuous, online water quality control.
Methodology and Instrumentation
Water flow from the PURELAB flex system passes through a UV-irradiation chamber where far-UV light oxidizes organic compounds to ionic species. Pre- and post-oxidation resistivity measurements determine the TOC concentration by the change in conductivity. Key components include:
- Far-UV lamp (185/254 nm) with oxidative efficiency monitoring and auto-recalibration.
- Resistivity sensors for pre- and post-oxidation measurements.
- Recirculation pump and downstream purification pack to remove generated ions.
Performance tests involved injecting 3 mL aliquots of 100 ppm methyl ethyl ketone into feedwater at different points in the measurement cycle and logging TOC readings continuously.
Main Results and Discussion
Comparative tests revealed that the PURELAB flex TOC monitor detects spikes in organic carbon within minutes regardless of injection timing. In contrast, the competitor’s monitor failed to register elevated TOC levels at the start of oxidation and exhibited significant delays when detecting contamination during the fill phase. Graphical data confirm the superior real-time response of the PURELAB flex system.
Benefits and Practical Applications
The rapid detection capability ensures that only water with verified low TOC is dispensed for sample preparation, safeguarding the integrity of demanding analytical workflows. Automated UV lamp efficiency checks and self-recalibration minimize maintenance downtime and maintain measurement accuracy over time.
Future Trends and Applications
Advances may include integration of multi-wavelength UV sources for improved oxidation efficiency across a broader range of organics, inline data analytics for predictive maintenance, and IoT connectivity for remote monitoring and control. Such developments will further strengthen quality assurance in pharmaceutical, semiconductor, and environmental laboratories.
Conclusion
The PURELAB flex real-time TOC system offers reliable, rapid monitoring of organic impurities in ultrapure water. Its superior response time and automated calibration features make it a valuable tool for laboratories requiring stringent water quality control.
Instrument Used
- PURELAB flex ultrapure water system
- Online UV photo-oxidation TOC monitor with pre- and post-oxidation resistivity sensors
Content was automatically generated from an orignal PDF document using AI and may contain inaccuracies.
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