Environmental Biology and Ecotoxicology Laboratory, Department of Environmental Sciences, Quaid-i-Azam University, Islamabad PO 45320, Pakistan.
Environment and Public Health Division, Department of Biosciences, COMSATS Institute of Information Technology, Pakistan.
Sci Total Environ. 2015 Feb 15;506-507:344-52. doi: 10.1016/j.scitotenv.2014.10.055. Epub 2014 Nov 24.
Extensive monitoring of organo-halogenated contaminants (OHCs) from surface soils of different land-use types from Pakistan was carried out during 2010. The concentrations (ng g(-1); dry weight) and profiles clearly indicated the dominance of ∑DDT contaminants followed by the ∑HCHs, ∑30PCBs, chlordanes, and ∑10PBDEs in descending order. Concerning the spatial patterns of occurrence, industrial soils exhibited relatively higher concentration of DDTs, heavy PCBs, and PBDEs (noticeably BDE-47 and -99 congeners), while the urban soils were characterized by high total PCBs (with relatively higher levels of light PCBs), following the agricultural soils. Compared to available criterion guidelines, the current results suggested that 10% of soil samples from industrial sites exhibited slightly higher levels (>50 ng g(-1)) of DDTs. The ∑TEQ levels for mono-ortho DL-PCBs ranged from 0.7 to 5.65 (1.9) pgTEQg(-1) dw in all the studied samples and PCB-118 contributed significantly towards the total calculated TEQs. The results of this study will contribute to the environmental management of OHCs contaminated areas of Pakistan.
2010 年期间，对来自巴基斯坦不同土地利用类型的表层土壤中的有机卤代污染物（OHCs）进行了广泛监测。浓度（ng g(-1)；干重）和分布情况清楚地表明，∑DDT 污染物占主导地位，其次是∑HCHs、∑30PCBs、氯丹和∑10PBDEs，按降序排列。关于发生的空间模式，工业土壤表现出相对较高浓度的滴滴涕、重多氯联苯和 PBDEs（明显的 BDE-47 和 -99 同系物），而城市土壤的特点是总多氯联苯含量较高（轻多氯联苯的含量相对较高），其次是农业土壤。与现有标准准则相比，目前的结果表明，工业场地 10%的土壤样本显示出略高的滴滴涕水平（>50 ng g(-1)）。所有研究样本中，单-邻位 DL-PCBs 的∑TEQ 水平范围为 0.7 至 5.65（1.9）pgTEQg(-1)dw，PCB-118 对总计算 TEQs 的贡献显著。本研究结果将有助于巴基斯坦受 OHCs 污染地区的环境管理。
