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Atmospheric deposition of heavy metals in the mining area of the San Jorge river basin, Colombia

机译：哥伦比亚圣豪尔赫河流域矿区的重金属大气沉降

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摘要

To characterize the atmospheric content of chemical contaminants, samples of atmospheric deposits were collected at several sites in the mining area of the San Jorge river basin, Colombia, during La Niña events (May 2010 and October 2011). Measurements of trace metals (Hg, Cu, Cd, Pb, Ni, and Zn) were performed after rain collection using a bulk deposition sampler in locations near a point source and sampling points located within a range of 30 Km away from the mine. As expected, concentrations were elevated in locations close to the ferronickel mining area with similar levels to other highly polluted areas. Concentrations of bulk precipitation and deposition were measured for Zn (23.07 ± 7.30 ng mL−1 and 227.5 ± 22.3 μg m−2 day−1, respectively) and Ni (2.20 ± 1.35 ng mL−1 and 21.2 ± 4.79 μg m−2 day−1) close to the coal and ferronickel mining. The other metals showed higher concentrations in sites nearby the artisanal and small-scale gold mining communities; and mercury raises special concern because high values of bulk deposition were found (58.3 ± 4.4 μg m−2 day−1), suggesting an intense Hg exposure in local residents. Moreover, no patterns of temporal distribution of heavy metals deposition were found during the sampling period. Overall, these results suggest that trace metal concentrations and fluxes are comparable to other locations in the world that are impacted by regional anthropogenic sources related to mining activities.
机译：为了表征大气中化学污染物的含量，在拉尼娜事件（2010年5月和2011年10月）期间，在哥伦比亚圣豪尔赫河流域矿区的多个地点采集了大气沉积物样本。在雨水收集之后，使用体相沉积采样器在点源附近的位置和距离矿井30公里范围内的采样点进行痕量金属（Hg，Cu，Cd，Pb，Ni和Zn）的测量。不出所料，靠近镍铁矿开采区的浓度升高，与其他高污染地区的浓度相似。分别测量了Zn（23.07±7.30 ngmL-1和227.5±22.3μgm-2·day-1）和Ni（2.20±1.35 ngmL-1和21.2±4.79μg·m-2）的总沉淀和沉积浓度。第-1天）靠近煤炭和镍铁矿开采。其他金属在手工和小规模采金社区附近的地点显示出较高的浓度；汞引起了特别的关注，因为发现了大量的沉积物（58.3±4.4μgm-2·day-1），这表明当地居民中汞的暴露量很高。此外，在采样期间未发现重金属沉积的时间分布格局。总体而言，这些结果表明，痕量金属的浓度和通量可与世界上其他地区相提并论，这些地区受到与采矿活动有关的区域人为来源的影响。

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