On-line combination of a silicone-tubing-probe measuring system with HRGC for the analysis of VOCs from water samples

A Silicone-Tubing-Probe measuring system with SnO2 sensor, based on the per meation of volatile organic compounds from a water sample to the gas phase through a dimethylsilicone membrane, was used for in-situ analysis of VOCs. The SnO2 sensor was used for the continuous determination of the sum of or ganic compounds liberated from the water sample. On-line combination of the measuring system with capillary gas chromatography enabled the determinati on of; individual compounds and the study of the analyte permeation process es. The system was tested by using selected aromatic hydrocarbons, oxygenat ed and chlorinated compounds in water as simulated samples. The compounds w ere isolated from the water matrix and analyzed in the 10 mu g/l - 400 mg/l concentration range. The combined Silicone-Tubing-Probe system can be used for monitoring volatile organic compounds in water samples.