气相色谱法测定空气中环氧乙烷

GC Determination of Ethylene Oxide in Air

用气相色谱法对空气中环氧乙烷进行了测定。采用徽章式扩散型被动式采样器采集了车间空气中的环氧乙烷，采集到的环氧乙烷在采样器中转化生成稳定的2-溴乙醇，再用二氯甲烷-甲醇（10＋90）溶液进行萃取，分取此溶液1．0“L直接进样进行气相色谱分析，根据测定溶液中2-溴乙醇的量来确定空气中环氧乙烷的含量。环氧乙烷的质量浓度在2．8～33．6mg·L-1范围内与峰面积呈线性关系，方法的检出限（3S／N）为0．38mg·L-1。方法的回收率在81．8％～92．3％之间，相对标准偏差（n=6）均小于5％。

Ethylene oxide in air was determined by gas chromatography. The ethylene oxide in air of workshop was sampled by using passive diffusion air monitoring badge as sampler, and converted into stable 2 bromoethanol. A mixture of CH2 Cl2 CH3 OH（10＋90） was used to extract 2-bromoethanol from the sampler and 1.0μL of the extract was taken for GC analysis. The amount of 2-bromoethanol found was converted into content of ethylene oxide. Linear relationship between values of peak area and mass concentration of ethylene oxide was found in the range of 2. 8--33.6 mg ·L-1, with its detection limit （3S/N） of 0. 38 mg ·L-1. Test for recovery was made by standard addition method, giving results of recovery in the range of 81.8%--92.3% . Values of RSD＇s （n=6） found were less than 5%.