Volatile Organic Compounds (VOCs) are carbon-containing molecules that readily evaporate at normal air temperature.Fuel oils, gasoline, industrial solvents, paints, and dyes are the major sources of VOCs and their improper discharge may cause severe damages to the environment and the human health. Therefore the determination of low concentrations of VOCs is of utmost importance when assessing the quality of drinking and raw source water. The U.S. Environmental Protection Agency (EPA) estimates that VOCs are present in one-fifth of the nations water supplies. For this reason, government agencies require monitoring of these contaminants at progressively lower levels. Several EPA methods require the use of purge and trap (P&T) systems to extract VOCs from water, although the technique is generally considered to be very burdensome. MASTER DHS動(dòng)態(tài)頂空及吹掃捕集儀