气相色谱法测定空气中苯、甲苯、二甲苯已经广泛地应用。然而,对每一分析方法的检验,必需有准确的标准进行对照,因此,标准样品的制备准确与否将直接影响其方法的准确度和精密度。苯及同系物的标准气制备法常采用动态配气法、静态配气法和二硫化碳溶液法。过去曾有报道玻璃容器对苯蒸气有吸附现 Determination of benzene, toluene, xylene in the air by gas chromatography has been widely used. However, the test for each analytical method must have accurate standards for comparison. Therefore, the accuracy of preparation of standard samples will directly affect the accuracy and precision of the method. Standard gas preparation of benzene and homologues often use dynamic distribution method, static distribution method and carbon disulfide solution method. Glass containers have been reported to adsorb benzene vapor in the past