Olu-Owolabi Bamidele I, Diagboya Paul N, Adebowale Kayode O
Department of Chemistry, University of Ibadan, Ibadan, Nigeria.
Department of Chemistry, University of Ibadan, Ibadan, Nigeria; National Center for Nanoscience and Technology, Beijing 100190, China.
J Environ Manage. 2014 May 1;137:1-9. doi: 10.1016/j.jenvman.2014.01.048. Epub 2014 Feb 28.
Sorption-desorption processes control soil-pollutant interactions. These processes determine the extent of pyrene transport in soils. Understanding sorption characteristics of pyrene is necessary in ascertaining its fate in soil. Laboratory batch experiments were conducted to study the sorptions-desorption of pyrene on eight soils from varying tropical agro-ecological zones (AEZs). The results showed that pyrene sorptions equilibria were attained within 720 min. Solution pH had a reciprocal effect on pyrene sorptions. Sorption was exothermic and increased with pyrene concentration in solution. The quantities of pyrene sorbed by each soil as well as the hysteresis were proportional to the percentage organic matter, and to some degree, the clay mineralogy. Sorption isotherms showed distributed reactivity involving several linear and non-linear isotherms. The present investigation showed that pyrene is likely to be more available to biota and reach the aquifer faster in low organic matter soils than those with relatively higher organic matter and more so in warmer climes.
吸附-解吸过程控制着土壤与污染物之间的相互作用。这些过程决定了芘在土壤中的迁移程度。了解芘的吸附特性对于确定其在土壤中的归宿至关重要。开展了实验室批量实验，以研究芘在来自不同热带农业生态区（AEZs）的八种土壤上的吸附-解吸情况。结果表明，芘的吸附平衡在720分钟内达到。溶液pH对芘的吸附有相反的影响。吸附是放热的，且随着溶液中芘浓度的增加而增加。每种土壤吸附的芘量以及滞后现象与有机质百分比成正比，在某种程度上也与粘土矿物学有关。吸附等温线显示出涉及多种线性和非线性等温线的分布反应性。目前的研究表明，与有机质相对较高的土壤相比，在低有机质土壤中，芘对生物群的可用性可能更高，并且更快到达含水层，在温暖气候下更是如此。
