Development of a modified method for the simultaneous determination of vinyl chloride monomer and ethylene dichloride in the air

ABSTRACT

A commercial grade activated carbon has been used as an adsorbent medium. It has been loaded via a simple device with different mixtures of vinyl chloride and ethylene dichloride each administered separately. About 3 g of loaded active carbon is put in a vacutainer tube while 10 ml of technical grade CS2 as adsorbent is added. The tube is stoppered and stored at 4C. After 24 hours, 1 ml aliquot is injected through a closed loop to a precalibrated infrared gas analyzer to assess the percentage recovery of vinyl chloride and ethylene dichloride. The spent activated carbon is washed thoroughly with water and is dried in two stages [at 50C for 8 hours and at 120C for 16 hours] to be used again. The procedure is accurate, precise, simple and economic. It gave percentage recoveries of 85% for VCM and 100% for EDC. It depends on the available resources, making it a suitable methodology to be applied in a developing country