Lin J M, Que Hee S S
Am Ind Hyg Assoc J. 1987 Jul;48(7):599-607. doi: 10.1080/15298668791385273.
PCBs with the highest vapor pressures (fewest chlorines) in Aroclors 1016, 1242, 1254 and 1268 were enriched in the vapor phase relative to the original Aroclor during volatilization from a glass surface for up to 8 hr. PCBs with the lowest vapor pressures (most highly chlorinated) were enriched in the corresponding residue. Thus, visual matching of gas chromatograms with those of Aroclor standards may not be sufficient to identify a specific Aroclor since the past history of a sample is often unknown. The enrichment also was detected using isomeric classes, but not using total chlorine content. The perchlorination method and the Webb-McCall method using all chromatographic peaks agreed quantitatively; this was not always so for the NIOSH multiple peaks and the Webb-McCall methods.
在长达8小时的从玻璃表面挥发过程中，与原始多氯联苯混合物（Aroclor）相比，Aroclor 1016、1242、1254和1268中蒸气压最高（氯含量最少）的多氯联苯在气相中得到富集。蒸气压最低（氯化程度最高）的多氯联苯则在相应的残渣中得到富集。因此，由于样品的过往历史往往未知，仅通过气相色谱图与Aroclor标准品的气相色谱图进行视觉匹配可能不足以鉴定特定的Aroclor。使用异构体类别也检测到了这种富集现象，但使用总氯含量则未检测到。全氯化方法和使用所有色谱峰的韦布 - 麦考尔方法在定量上是一致的；对于美国国家职业安全与健康研究所（NIOSH）的多峰方法和韦布 - 麦考尔方法，情况并非总是如此。
