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Indoor air pollution by organic emissions from textile floor coverings. Climate chamber studies under dynamic conditions
The time dependence of the emission of organic compounds from a polyamide with styrene-butadiene-rubber (SBR) backing was studied in three climate chambers. While volatile compounds such as toluene reach a maximum concentration in the gas phase within 1 h and decrease in concentration to less than 2% within 60h, the concentration of less volatile compounds, such as 4-phenylcyclohexene, decreases slowly over a period of months. If the chamber is well mixed and a defined chamber loading is maintained the observed concentrations do not depend on the chamber size, the wall material and air velocity. The concentration of the observed emissions is roughly proportional to the chamber loading. Surprisingly it is not inversely proportional to the air exchange rate. Rather, at high air exchanges rates mass transfer from the carpet to the gas phase is enhanced.