Influence of environmental variables on the spatial distribution of PCBs in Norwegian and UK soils: Implications for global cycling
Influence of environmental variables on the spatial distribution of PCBs in Norwegian and UK soils: Implications for global cycling
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DOI：
10.1021/es010322i
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发表时间：
2002-05-15
影响因子：
11.4
通讯作者：
Jones, KC
中科院分区：
文献类型：
--
作者：
Meijer, SN;Steinnes, E;Jones, KC
本文报道了环境变量对土壤中多氯联苯（PCBs）含量的影响及其总体分馏。土壤采样偏远林地（针叶和落叶）和草地的纬度样带通过英国和挪威的位置。不同的过程控制PCB的浓度和负担在针叶林，落叶，草地土壤系统，这些进行了讨论，重点是冠层清除和土壤有机质（OM）含量的影响。一般而言，以皮克/克（-1）干重为基础计算，各地点之间的浓度差异较轻的多氯联苯为1-2个数量级，较重的多氯联苯为2-3个数量级。当以pg g（-1）OM表示时，这些差异降低了一个数量级。该数据集表明，更挥发性的多氯联苯是朝着平衡与OM负担的土壤舱在欧洲区域范围内，而分布的“粘性”，较重的同系物似乎仍然主要是受其优先沉积更接近源区。三-和四-多氯联苯的相对浓度随纬度的增加，而七-和八-多氯联苯的相对浓度降低，与全球分馏理论一致。然而，回归斜率相当浅，具有高分散性，这意味着许多环境和土壤相关因素（如降水，有机碳含量和类型，其他土壤性质，当地来源等）。也在影响观察到的同系物模式。温度驱动的分馏，虽然明显的操作和检测，需要考虑在这个更广泛的背景下。
This paper reports the influence of environmental variables on soil concentrations of polychlorinated biphenyls (PCBs) and their global fractionation. Soils were sampled from remote woodland (coniferous and deciduous) and grassland locations on a latitudinal transect through the United Kingdom and Norway. Different processes control PCB concentrations and burdens in coniferous, deciduous, and grassland soil systems; these are discussed, with emphasis on the influence of canopy scavenging and soil organic matter (OM) content. In general, concentration differences between sites were 1-2 orders of magnitude for lighter PCBs and 2-3 orders of magnitude for heavier PCBs, when expressed on a pg g(-1) dry weight basis. These differences decreased by up to an order of magnitude when expressed as pg g(-1) OM. The dataset suggests that the more volatile PCBs are moving toward equilibrium with the OM burden of the soil compartment on a European regional scale, while the distribution of the "stickier", heavier homologues appears to still be primarily influenced by their preferential deposition closer to source areas. The relative concentration of the tri- and tetra-PCBs increases with latitude, while that of the hepta- and octa-PCBs decreases, consistent with the global fractionation theory. However, the regression slopes are quite shallow, with high scatter, implying that many environmental and soil-related factors (such as precipitation, organic carbon content and type, other soil properties, local sources, etc.) are also influencing the observed congener patterns. Temperature-driven fractionation, while clearly operating and detectable, needs to be considered in this broader context.