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首页> 外文期刊>The Science of the Total Environment >Historical smelting activities in Eastern Canada revealed by Pb concentrations and isotope ratios in tree rings of long-lived white cedars (Thuja occidentalis L)
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Historical smelting activities in Eastern Canada revealed by Pb concentrations and isotope ratios in tree rings of long-lived white cedars (Thuja occidentalis L)

机译：加拿大东部的历史冶炼活动揭示了Pb浓度和长寿白色Cedars（Thuja Occidentalis L）的树圈中的同位素比率

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Mining activities at Duparquet in Western Quebec (Canada) have significantly affected the local environment and left behind significant amounts of metals. Monitoring this contamination is essential to infer its past and present impacts on environmental quality and to evaluate the resulting human exposure. In that context, we measured long time series of Pb concentrations and their corresponding stable isotope ratios in long-lived white cedars (Thuja occidentalis L.) growing at Duparquet Lake in order to evaluate potential time variations of the Pb environmental contamination as well as to identify the responsible source(s). Results show that before 1950, Pb at Duparquet is mostly terrigenous. Lead concentrations rapidly increase afterwards. A simultaneous shift to lower ~(206)Pb/~(207)Pb ratios identifies the smelting of Abitibi ores as the source of contamination. An isotope mass balance model evaluates at roughly 7.5-20%, 5-40%, 5-9% and ＜3% the Pb contributions from local smelters at distances of 3.6,3.9,7 and 9 km, respectively. The dispersion of the Pb contamination plume is possibly driven by the distance from the Beattie smelter. We finally estimated a delay of at least 13 years between atmospheric emissions from the Beattie smelting activities and the time they are recorded by tree rings. Ultimately, this study demonstrates that white cedar tree rings series provide reliable archives of past and present Pb atmospheric contamination.
机译：魁北克西部杜帕库斯（加拿大）的采矿活动显着影响了当地环境，并留下了大量金属。监测这种污染对于推断过去和目前对环境质量的影响至关重要，并评估所得的人体暴露。在这种情况下，我们测量了在Duparquet湖泊的长寿白豆（Thuja occidentalis L.）中长时间序列的Pb浓度及其相应的稳定同位素比率，以评估Pb环境污染的潜在时间变化以及识别负责源。结果表明，在1950年之前，Duparquet的PB大多是有害的。之后铅浓度迅速增加。同时转移到下〜（206）Pb /〜（207）Pb比率识别Abitibi Ores作为污染源的熔炼。同位素质量平衡模型评估大约为7.5-20％，5-40％，5-9％和<3％的PB贡献，分别在3.6,3.9,7和9公里处的距离。 PB污染羽流的分散可能由距离麦比冶炼厂的距离驱动。我们终于估计了Beattie冶炼活动的大气排放之间至少13年的延迟，并且他们被树戒指记录的时间。最终，本研究表明，白雪松树环系列提供了过去的可靠档案，并呈现PB大气污染。

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