The measurement of chemicals in ‘on-line’ situations can be critical in waste monitoring and process control with the detection of volatile or semi-volatile compounds in waste water often critical in demonstrating compliance. Rapid analysis enables decisions to be taken regarding effluent treatment, which can be expensive for the industry. Within this application note, we show how the flow cell can be used to fully automate analysis of residual solvents from an effluent stream using static headspace GC-FID. The method was optimised to provide a high throughput solution with high frequency of sampling with minimal operator input. Using an internal standard, good reproducibility was achieved for a range of solvents in effluent (%rsd typically <5%). This approach could be used in a number of applications when sampling from flowing liquids, particularly in the water industry where the use of expensive treatment can be avoided.
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The On-Line Measurement of VOCs in Flowing Water