Haque R, Kohnert R
J Environ Sci Health B. 1976;11(3):253-64. doi: 10.1080/03601237609372040.
The vapor loss of several PCB isomers from stainless steel planchets surfaces has been studied. Experiments were carried out under two different conditions. In one case, the vapor loss was observed from 2 molecular layers of PCB, while in the other series, the loss from approximately 200 molecular layers was observed. In both cases the loss of PCB from the surface was substantial, although the controlling mechanism of vapor loss was different. In the first case, the transport was approximated by a simple first order rate law, whereas in the latter case, it was a diffusion controlled process. In general, the vapor loss decreased with increasing number of chlorine atoms present in the isomer. The 4,4(1)-dichlorobiphenyl showed a deviation as compared to others indicating that such factors as the electronic distribution, position of chlorine atom on the biphenyl ring and symmentry of the molecule are also important in discussing the vapor transport.
对几种多氯联苯异构体在不锈钢平板表面的蒸汽损失进行了研究。实验在两种不同条件下进行。在一种情况下，观察到来自两分子层多氯联苯的蒸汽损失，而在另一组实验中，观察到来自约200分子层的损失。在这两种情况下，多氯联苯从表面的损失都很显著，尽管蒸汽损失的控制机制不同。在第一种情况下，传输可用简单的一级速率定律近似，而在第二种情况下，它是一个扩散控制过程。一般来说，蒸汽损失随着异构体中氯原子数目的增加而降低。与其他异构体相比，4,4(1)-二氯联苯表现出偏差，这表明诸如电子分布、氯原子在联苯环上的位置以及分子对称性等因素在讨论蒸汽传输时也很重要。
