OCPs and PCBs from surface soils in two high-altitude areas in Guangdong Province were investigated by adopting the quincunx sampling design and using GC-ECD. The results showed that the contents of OCPs and PCBs in the surface soils from Luofufihan Mountain ranged from 3.77 to 9.51 ng/g and 1.85 to 4. 06 ng/g, respectively, with the maximum value at the elevation of 888 m and 824 m, respectively. The contents of OCPs and PCBs in the surface soils from Nanling Mountain ranged from 1. 47 to 2. 23 ng/g and 1. 15 to 2. 49 ng/g, respectively, both with the maximum value at the elevation of 1900 m. Most of the studied compounds were obviously influenced by the mountain cold-trapping effect in the high-altitude areas, with the concentrations of the compounds increasing with the increase of altitude. The accumulation trends obeyed the Mountain-POP model. In the two areas,some compounds showed different distribution patterns from the Mountain-POP model, which was due to environmental factors such as the geographical and meteorological conditions. The study gives further evidence that both the combined effects of the compounds' physical and chemical properties and environmental factors have much influence on the transportation and accumulation of POPs.%采用梅花布点法采样,气相色谱-电子捕获检测法分析,对广东省两处高海拔地区表层土壤中OCPs(有机氯农药)和PCBs(多氯联苯)进行研究.结果表明,罗浮山表层土壤中w(OCPs)和w(PCBs)分别为3.77 ～9.51和1.85～4.06 ng/g,最大值分别出现在海拔888和824m.南岭表层土壤中w(OCPs)和w(PCBs)分别为1.47～2.23和1.15 ～2.49 ng/g,最大值均出现在海拔1900m.在表层土壤中大部分目标化合物的浓度随着海拔的增高而增加,表现出较为明显的高山冷凝结现象,累积规律基本上符合Mountain-POP模型.但由于研究区域与Mountain-POP模型假设区域有地理环境和气象条件的差异,一些化合物的高山冷凝结规律与Mountain-POP模型存在一定差异,该现象应为所研究地区不同的自然环境因素所致.化合物本身的理化性质和研究区域的自然条件因素可影响持久性有机污染物的迁移、累积效果.
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