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QUALITATIVE AND QUANTITATIVE DETECTION OF VOLATILE ORGANIC EMISSIONS FROM VEHICLE TIRES
Anjali Srivastava and Sunil Patil, National Environmental Engineering Research Institute, Mumbai Zonal Laboratory

ABSTRACT

There are large number of sources of Volatile Organic Compounds (VOCs) in urban air. Vehicles are supposed to contribute maximum to ambient levels of VOCs. Vehicle tires, though to a smaller extent as compared to fuel, also contribute to VOC levels. Two grams of airplane and automobile tyre were enclosed in desorption tube and heated to 250oC. Desorbed gases were analyzed by gas chromatograph with mass spectrometer. Varian make GC-MS with injection mode of sample was used; the coloumn used was DB624 capillary column of 30 m length, 0.32 mm internal diameter and 1.8 micro film. Ion trap temperature was maintained at 125oC. About Sixty-six VOCs were identified by thermal desorption /gas chromatography/mass spectrometry in the emissions of vehicle tires. The most common VOCs were aromatic, aliphatic and halogenated hydrocarbons, aldehyde & ketones, amines & acids, phenyls & esters. About twelve VOCs identified fall under the category of Hazardous Air Pollutants as defined in USEPA Clean Air Act Title III (1990). Some VOCs have been quantified. Concentration of VOCs per 100 gm of product was found to be more in case of automobile tire as compared to airplane tires.

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