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J Occup Health year 2008 volume 50 number 2 page 122 - 129
Classification Originals
Title Development of a Sampling and Analysis Method for 4-Vinyl-1-cyclohexene in Air
Author Pornpimol Kongtip1, Bantoon Tangprakorn2, Witaya Yoosook1 and Suttinun Chantanakul1
Organization 1Department of Occupational Health and Safety, Faculty of Public Health, Mahidol University and 2The Bangchak Petroleum Public Company Limited, Thailand
Keywords 4-Vinyl-1-cyclohexene, Gas chromatography, Sampling and analysis
Correspondence P. Kongtip, Department of Occupational Health and Safety, Faculty of Public Health, Mahidol University, 420/1 Rajvidhi Road, Bangkok 10400, Thailand (e-mail: phpkt@mahidol.ac.th)
Abstract Development of a Sampling and Analysis Method for 4-Vinyl-1-cyclohexene in Air: Pornpimol Kongtip, et al. Department of Occupational Health and Safety, Faculty of Public Health, Mahidol University, Thailand-The purpose of this research was to develop an applicable sampling and analytical method to determine airborne 4-vinyl-1-cyclohexene concentrations which are usually found in the atmosphere of polybutadiene factories. A solid sorbent tube, containing two sections (100 mg in the front and 50 mg in the back) of activated coconut-shell charcoal was chosen for sampling 4-vinyl-1-cyclohexene vapor. The 4-vinyl-1-cyclohexene in the charcoal samples was desorbed with carbon disulfide and analyzed by gas chromatography equipped with a flame ionization detector. The suitable air flow rate, adsorption capacity, sample storage stability, desorption efficiency and reliability of the method for sampling and analysis of 4-vinyl-1-cyclohexene were evaluated. The method was applied to sampling and analysis of 4-vinyl-1-cyclohexene in the rubber industry. The results indicated a suitable air flow rate of 0.3 to 1.5 l/min. The adsorption capacity of 4-vinyl-1-cyclohexene on 100 mg of charcoal was 0.2134 mg. The 4-vinyl-1-cyclohexene adsorbed on the charcoal was stable for 7 d at room temperature or 21 d in a refrigerated condition. The average percent desorption efficiency of 4-vinyl-1-cyclohexene ranged from 90.45% to 97.04% with the loaded amount ranging from 0.412 to 8.250 g using 1 ml carbon disulfide. The limit of detection of 4-vinyl-1-cyclohexene was 0.044 ng. The average percent recoveries (n=6) of 4-vinyl-1-cyclohexene adsorbed on charcoal ranging from 0.46 to 8.87 g were 96.78-102.87% with relative standard deviations (RSDs) of 0.34-1.92%, respectively. The concentrations of 4-vinyl-1-cyclohexene ranged from 0.011 to 0.105 mg/m3 in the working environment of a polybutadiene factory.