Method and apparatus for environmentally monitoring organic compounds

摘要

Low concentrations of environmental monitoring of organic compounds in media such as groundwater are affected by the use of diffusion cells 112 having polymer thin films formed in helical tubes and submerged in environmental fluids. Organic compounds having concentration levels in the range of 1 (ppb) and 1 trillion (ppt) diffuse through the polymeric material. The carrier gas in the polymer tube requires a concentration of organic compound that is generally in equilibrium with that of the organic compound in the environmental fluid. For the purpose of allowing monitoring with a detector with a sensitivity that is not a very low level of organic compounds, a thickener such as a thermal desorption tube is intended for gas treatment and for periodic thermal activity to allow emissions from the organic compounds detected in the sensor. Can be provided.