1995 Volume 11 Issue 6 Pages 953-960
A method for simultaneous determination of 26 halogenated volatile organic compounds (VOCs) in air is developed. In order to determine a large variety of volatilities of halogenated VOCs, a collection tube packed with two layers of activated carbons (Carbosieve S2 and Carbopack B) was adopted for air sampling and a tube packed with Carbopack B (with a length of 50mm) was adopted for a trap tube of the TCT (thermal desorption and cold trap) injection system. The total recoveries of the method were examined under several conditions. Twenty six kinds of halogenated VOCs were recovered with more than 80% yield under conditions of 20°C, relative humidity of 80-100% and induced air volumes of 10-30l: the recovery ratios were 89-113% and the relative standard deviations were 1.7-8.8% in the case of the induced air volume of 20l. Under a condition of 40°C and induced air volume of 20l, the recovery ratios of these VOCs, except CFC-12, were 63-119%: the recovery ratio of CFC-12 ranged 98-12% in the case of induced air volumes of 5-20l.
