Abstract: A test method for determination of naphthalene was established by gas chromatography using back-flush technique. The effects of back flushing pressure, back flushing time, chromatographic column temperature, solvent, internal standard were explored, and the internal standard curve were established for quantification. The linear correlation coefficient of quantitative standard curve is 0.999 9, the recovery of naphthalene content is between 98.5%~101.1% with relative standard of deviation less than 0.34%. The method has good accuracy and repeatability and meets the requirement of the determination of naphthalene in high temperature coal tar.

Key words: high temperature coal tar, naphthalene, GC, internal standard method, back flushing