Simultaneous determination of 4 butanol isomers in workplace air by thermal desorption-gas chromatography
HUANG Hong1, DOU Wen-yuan1, CHEN Fei-long1, HOU Jun-pei1, YANG Jia-hui1, LU Jin-dan1, CHEN Ze-xiong2, ZHOU Zhi-hong2
1. Guangdong Provincial Key Laboratory of Emergency Test for Chemical Hazard, China National Analytical Center, Guangzhou, Guangdong Academy of Sciences, Guangzhou 510070, China; 2. Guangzhou Environmental Monitoring Center, Guangzhou 510030, China
Abstract: A method for simultaneously determining the contents of 4 kinds of butanol isomers in the air of workplace is developed by thermal desorption/gas chromatography combined technique using Tenax-TA adsorption tube as adsorbent.The thermal desorption and gas chromatography conditions are optimized,and the precision and accuracy of this method are investigated by determining the linear range and working curve through using standard samples.This method is applied to the determination of 4 kinds of butanol isomers in the air of workplace.The determination results show that the mass concentrations of 4 kinds of butanol isomers exhibit a good linear relationship within each formulated mass concentration range,with correlation coefficients of 0.999 4-0.999 9.The recoveries of standards samples range from 96.2% to 105%,and the relative standard deviations of six repeated measurements are all within 3%.Thermal desorption efficiency of four isomers are all above 98%,and their detection limits are in the array of 0.003-0.005 mg·m-3.This method shows good accuracy,precision and sensitivity,and is suitable for the detection of the air in workplace.