de Oliveira Shirlei Aparecida, de Lucena Tavares Sílvio Roberto, Barbosa Maria Claudia
Civil Engineering Program, Federal University of Rio de Janeiro, UFRJ, Rio de Janeiro, RJ, Brazil.
Brazilian Agricultural Research Corporation - Embrapa, Rio de Janeiro, RJ, Brazil.
Bull Environ Contam Toxicol. 2018 Sep;101(3):365-371. doi: 10.1007/s00128-018-2403-8. Epub 2018 Aug 17.
Pb, one of the constituents of ammunition, was identified as a contaminant in an ammunition destruction site. The present study aimed to assess Pb adsorption in the horizons of an uncontaminated representative soil profile of the region where the ammunition destruction site is located. Batch test experiments were performed to determine Pb adsorption in soil horizons, using solutions with natural and modified pH. The ISOFIT software was used to select the isotherm model that best fit Pb adsorption in soil horizons. The results showed that the Langmuir model is the best fit, because it presented the lowest corrected Akaike information criterion value. In addition, the graphical analysis indicated a Langmuir-type isotherm. The Langmuir isotherm parameter (Q) indicated lower Pb adsorption capacity in the surface soil layers when compared with that in the deeper layers. The change in the initial solution pH influenced Pb adsorption, mainly in superficial horizons. Thus, the risk of soil Pb contamination might be more pronounced in the surface soil layers.
铅是弹药的成分之一，在一个弹药销毁场地被确定为污染物。本研究旨在评估在弹药销毁场地所在区域未受污染的代表性土壤剖面各层中铅的吸附情况。进行了批量试验，以使用天然pH值和改性pH值的溶液来测定土壤各层对铅的吸附。使用ISOFIT软件选择最适合土壤各层铅吸附的等温线模型。结果表明，朗缪尔模型拟合效果最佳，因为它的校正赤池信息准则值最低。此外，图形分析表明是朗缪尔型等温线。朗缪尔等温线参数（Q）表明，与深层土壤相比，表层土壤中铅的吸附能力较低。初始溶液pH值的变化影响铅的吸附，主要在表层土壤层。因此，表层土壤层中土壤铅污染的风险可能更为明显。
