ガスクロマトグラフィーによる排気ガス中のシアン化水素分析法
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概要
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Gas chromatographic determination of a small amount of hydrogen cyanide in exhaust gases was studied by using the flame ionization detector and a precolumn. This method is based upon the findings that propane and hydrogen cyanide are 10:1 in sensitivity to FID. The chromatographic conditions are as follows: main analytical column packing, Porapak Q80/100 mesh; column size, 3 m×4 mm i.d., glass; column temperature, programmed to raise 30℃ to 50℃ at 2℃/min and 50℃ to 200℃ at 5℃/min; carrier gas, nitrogen; calibration gas, propane. Exhaust gas sample is collected in an evacuated 1 liter sampling bottle, and is concentrated by passing it through the precolunm (a glass tube packed with Porapak Q80/100 mesh) in dry ice acetone bath. Then, the trapped gas sample is injected to the GC by heating the precolumn. The peak of HCN which appears between those of ethane and propylene, is separated by 9 min of retention time from the former and by 2 min from the latter when a 3 m column is used. A 2 m column is not enough to isolate it from them. Other interfering gases including inorganic ones have not been detected by FID. The concentration of HCN is calculated from the ratio of the peak area of the sample to the calibrated peak area of standard propane gas. The lower limit of determination of hydrogen cyanide is 0.1 ppm when 1 litter of the gas is sampled. This method can be applied not only to the determination of exhaust gases but also to that of ambient gaseous sample.
- 社団法人日本分析化学会の論文
- 1979-09-05