GC DETERMINATION OF 2-BUTANONE AND BENZENE IN AMBIENT AIR AND EXHAUST AIR TANG Fang-liang and ZHU Wen (Hangzhou Environmental Monitoring Centre, Hangzhou 310007,China)
Abstract:Sampling of micro-amounta of 2-butanone and benzene in ambient air and exhaust air was carried out by their adsorption on active carbon filled in a sampling tube, and then desorbed with 2.00ml of carbon disulfide. Two μL of the desorbed solution were taken and analyzed by gas chromatography. Satisfactory separation was attained by using PEG-20M column. Retention time method was used in the qualitative analysis and peak height method was used in the quantitative analysis. Mixed standard solutions containing 2-butanone from 0.00 to 64.8mg•L-1 and benzene from 0.00 to 70.4 mg•L-1(in CS2) were used to prepare an external standard curve. RSD’s(n=8) for 2-butanone and for benzene were found to be in the range of 2.5%~2.8% and 2.5%~3.8% respectively. Recoveries found for 2-butanone and for benzene were in the range of 86.2% to 104.6% and 91.3% to 105.7% respectively. The detection limits(S/N=2) were found as 0.03mg•m-3(for 2-butanone and 0.01mg•m-3(for benzene) under the experimental conditions mentioned above and when 20L of sampling volume were taken.
Keywords:Gas chromatography; 2-Butanone; Benzene; Ambient air; Exhaust air 2-丁酮和苯都是常用的有机溶剂,应用广泛。由于苯有毒有害,是人类公认的致癌物之一,在生产和使用过程中不可避免地会造成对人体的损害和对环境的污染[1]。随着人们环保意识的提高,人们已越来越多的用低毒或无毒溶剂来代替毒性大的溶剂,2-丁酮是常用的替代品之一,如有些胶粘剂所用的溶剂,就有用2-丁酮来代替苯、甲苯、二甲苯作为溶剂的。环境空气和废气中的苯常用气相色谱法测定[2],车间空气中2-丁酮也有用气相色谱法进行测定的报道[3],但环境空气和废气中2-丁酮和苯的同时分离和测定还较少报道。本文用活性炭吸附富集环境空气和废气中2-丁酮和苯,经二硫化碳(CS2)解吸后气相色谱法测定,方法简便、快速,用于实际样品测定,结果满意。