Department of Environmental Sciences, Quaid-i-Azam University, Islamabad 45320, Pakistan.
Centre for Chemicals Management, Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster LA1 4YQ, UK.
Sci Total Environ. 2018 Apr 15;621:1568-1580. doi: 10.1016/j.scitotenv.2017.10.071. Epub 2017 Nov 8.
Black carbon (BC) and total organic carbon (TOC) along with their relationship with organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) were assessed in Lesser Himalayan Region (LHR) in different altitudinal zones based on anthropogenic influence/source proximity under the scope of this study. Results revealed the concentrations of BC, TOC, OCPs and PCBs varied between 0.3 and 43.5mgg, 1.7-65.4mgg, 0.59-3.64ngg and 0.01-1.31ngg, respectively. Spatial distribution trends have shown higher levels of OCPs and PCBs contamination near populated and urban areas along the altitude. It is implicated that upslope, short and long-range transport and local emission sources contribute to the contamination of different altitudinal zones of LHR. The relationship of BC and TOC with OCPs and PCBs was evaluated using principal component analysis (PCA) and Pearson correlation analysis that indicated higher sorptive influence of BC over TOC in distribution status of organochlorines in LHR. Further research is required to find relationship of BC and TOC in surface riverine sediments, particularly in aquatic systems along the altitude in mountain regions of the world.
本研究在小喜马拉雅地区（LHR）不同海拔高度范围内，根据人为影响/源接近程度，评估了黑碳（BC）和总有机碳（TOC）及其与有机氯农药（OCPs）和多氯联苯（PCBs）的关系。结果表明，BC、TOC、OCPs 和 PCBs 的浓度分别在 0.3 到 43.5mgg、1.7 到 65.4mgg、0.59 到 3.64ngg 和 0.01 到 1.31ngg 之间变化。空间分布趋势表明，在人口密集和城市地区附近，OCPs 和 PCBs 的污染水平较高。这表明上坡、短程和远程传输以及当地排放源导致了 LHR 不同海拔高度地区的污染。使用主成分分析（PCA）和 Pearson 相关分析评估了 BC 和 TOC 与 OCPs 和 PCBs 的关系，结果表明，在 LHR 中，BC 对 OCPs 的吸附影响高于 TOC。需要进一步研究，以发现 BC 和 TOC 在表层河流沉积物中的关系，特别是在世界山区沿海拔高度的水生系统中。
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