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Case Study VOCs analysis in water by Purge&Trap

Case Study VOCs analysis in water by Purge&Trap
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Case Study VOCs analysis in water by Purge&Trap - 1

Case Study N°AA7 – Ambient air monitoring – VOC Purge & trap – updated: 09.10.15 Case Study Ambient Air Monitoring Applications Analysis of VOC compounds in water by Purge & Trap or dynamic headspace Context & Challenges Volatile organic compounds (VOC) can be dissolved in water. Sometimes water is polluted and to study contamination of VOC in finished drinking water, VOC must be measured. Chromatotec® Solutions Chromatotec® has developed a specific system for the measurement of VOC in water: a Purge & Trap system, the airmoPURGE. The analyzer is coupled with a degasing system allowing the extraction of dissolved gases. The complete system is based on: - 502.2 method from US EPA – “Volatile organic compounds in water by purge and trap capillary column gas chromatography with photoionization and electrolytic conductivity detectors in series – Revision 2.1”. 524.2 method from US EPA – “Measurement of purgeable organic compounds in water by capillary column gas chromatography/mass spectrometry – Revision 4.0”. Technical information and results A degasing system using an inert gas, nitrogen, was used to extract VOC from water. A constant volume of water is injected into the system. Then, the extracted gases will go to the analyzer to be evaluated. Degasing system: Purge composition The system is designed to extract VOC dissolved in water. The different parts of the degasing system are: A sparger to extract VOC from water A pressure regulator to adjust the N2 inlet pressure (extraction with 40 ml/min) A 5 ml sampling loop A peristaltic pump to fill up the loop An injection valve to inject water inside the sparger Solenoid valves A pinch valve to evacuate water after extraction Ultra-High Purity (UHP) Nitrogen generator (Nitroxychrom) The consumption of water is around 25 ml/min when the peristaltic pump is turned on. sales@chromatotec.com www.chromatotec.com

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Case Study VOCs analysis in water by Purge&Trap - 2

Case Study N°AA7 – Ambient air monitoring – VOC Purge & trap – updated: 09.10.15 Application and Results This analyzer is used to continuously monitor VOC components in water. Sample conditions: The sample could be: - Environment: raw source water, river water, seawater, rain water - Drinking water: treated drinking water, bottled water The water sample must be filtered before being injected into the airmoPURGE system. A sample preparation system needs to be added for non-filtered water. The measurement range – 0.02-200 µg/l – could be adapted thanks to the size of the sampling loop and the...

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Case Study VOCs analysis in water by Purge&Trap 2Pages

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Case Study VOCs analysis in water by Purge&Trap
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