Method for determining content of tribenzene in coke oven gas by gas chromatography

The invention discloses a method for determining the content of triphenyl in coke oven gas by gas chromatography, which comprises the following steps: preparing a triphenyl standard stock solution: preparing the triphenyl standard stock solution with accurate concentration by using CS2 as a solvent according to the content of the coke oven gas in front of and behind a tower and the concentration gradient of the triphenyl; drawing a standard curve: taking a plurality of standard stock solutions with accurate volumes from the stock solutions according to the standard curve making requirements of an external standard method, putting the standard stock solutions into a plurality of glass injectors, diluting the standard stock solutions to a scale by using benzene-free air, heating the standard stock solutions until the standard stock solutions are completely vaporized, and making the standard curve through chromatographic sample introduction; and measuring the sampled gas, namely performing chromatographic sampli