Huang I W, Hong C S, Bush B
School of Public Health, State University of New York at Albany, USA.
Chemosphere. 1996 May;32(9):1869-81. doi: 10.1016/0045-6535(96)00080-x.
A generator-column technique was used to prepare aqueous solutions of PCBs. The degradation of 2-chlorobiphenyl, Aroclor 1248, Aroclor mixture (1221, 1016, 1254, and 1260) and St. Lawrence River water by simulated sunlight or sunlight has been investigated in the presence of aqueous suspensions of TiO2. The effect of TiO2 concentration and pH on the degradation rate of PCBs have been studied. The reaction rate followed apparent first-order kinetics and increased with increasing TiO2 concentration. The half-life of the degradation process for 2-chlorobiphenyl is 20 minutes at pH 10 and 9 minutes at pH 3 in the presence of 25 mg/L of TiO2. Less chlorinated PCBs decomposed faster than higher chlorinated ones. The rate constants and half-lives of individual PCBs in the commercial PCB mixture and St. Lawrence River water were also measured.
采用发生器柱技术制备多氯联苯的水溶液。在二氧化钛水悬浮液存在的情况下，研究了模拟阳光或阳光对2 - 氯联苯、Aroclor 1248、Aroclor混合物（1221、1016、1254和1260）以及圣劳伦斯河水的降解作用。研究了二氧化钛浓度和pH值对多氯联苯降解速率的影响。反应速率遵循表观一级动力学，且随二氧化钛浓度的增加而增加。在25 mg/L二氧化钛存在的情况下，2 - 氯联苯降解过程在pH值为10时的半衰期为20分钟，在pH值为3时为9分钟。氯含量较低的多氯联苯比氯含量较高的多氯联苯分解得更快。还测定了商业多氯联苯混合物和圣劳伦斯河水中各多氯联苯的速率常数和半衰期。
