二硝基甲苯(DNT)中主要含3,5二硝基邻甲酚和3,5二硝基对甲酚。本文用 KOH 稀溶液从 DNT 的甲苯溶液中提取二硝基甲酚,以3,5二硝基邻甲酚或3,5二硝基对甲酚作标准,采用标准加入法、酸化同浓度被测溶液作参比,在碱性介质两种二硝基甲酚具有相同摩尔吸光系数的吸收波长436nm 处,用光度法测定二者的总量。在二硝基甲酚浓度为2.5 Dinitrotoluene (DNT) mainly contains 3,5-dinitro-o-cresol and 3,5-dinitro-p-cresol. In this paper, dilute solution KOH DNT extracted from the toluene solution of dinitrocresol to 3,5-dinitro-o-cresol or 3,5-dinitro-p-cresol as a standard, using standard addition method, acidification with the concentration of Measured solution as a reference, two kinds of dinitresol phenol in the alkaline medium with the same molar absorption coefficient of the absorption wavelength of 436nm at the photometric method to determine the total amount of both. At a dinitro cresol concentration of 2.5