顶空毛细管柱气相色谱法测定工业废水中微量丙烯腈

目的:建立顶空毛细管柱气相色谱测定水中微量丙烯腈分析方法.方法:水中丙烯腈在恒温密闭顶空瓶中达到汽液两相分配平衡时,取液上气相样品注入气相色谱仪测定丙烯腈含量,并对顶空体积、平衡温度、平衡时间及色谱条件进行优化.结果:本法丙烯腈保留时间3.60min,线性范围1.26～20.15 mg/L,回归方程:y=0.314+2...

Determination of trace acrylonitrile in industrial wastewater by headspace-GC（FID）

Objective： To establish a determination method of trace acrylonitrile in industrial wastewater by GC（FID）.Methods： Acrylonitrile in water was segregated by headspace bottle in tepidarium into the gas,detected by gas chromatography with hydrogen flame ion detector（GC-FID）,and the optimal parameters of the method were explored（headspace,balance temperature and time,and chromatographic condition）.Results： Under the optimal conditions above,the retention time of acrylonitrile was 3.60 minutes,linear range of this method was from 1.26mg/L to 20.15mg/L,regression equation was y（areas of chromatographic peak） =0.314＋2.60x（concentration of standard）,correlation coefficient r=0.9996,detecting limit was 0.08mg/L,relative standard deviation was between 2.66% and 4.63%,recovery of added standard was between 97.67% and 104.78%,and acrylonitrile did not be interfered with some coexistence substances： methanol,n-propanol,acetonitrile and benzene.Conclusion： The determination method has been proven to be simple and effective,with good accuracy,precision and sensitivity,and can satisfy the monitoring demand of acrylonitrile in water.