摘要
用活性炭吸附环境空气和废气中的 2 丁酮和苯 ,经二硫化碳解吸后用气相色谱法测定。方法的回收率 2 丁酮为 86 .2 %～ 10 4 .6 % ,苯为 91.3%～ 10 5 .7% ;相对标准偏差 2 丁酮为2 5 %～ 2 .8% ,苯为 2 .5 %～ 3.8%。当采样体积为 2 0L ,解吸液体积为 2 .0 0ml,进样体积为 2 μl时 ,2 丁酮和苯的最低检测浓度分别为 0 .0 3mg·m- 3和 0 .0 1mg·m- 3。
Sampling of micro amounts 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 70.4mg·L -1 (in CS 2) 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 of 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.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2003年第2期102-104,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
