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首页> 外文期刊>Environmental Science & Technology >Dissolved Organic Carbon in Lakes of the Athabasca Oil Sands Region: Is Color an Indicator of Acid Sensitivity?
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Dissolved Organic Carbon in Lakes of the Athabasca Oil Sands Region: Is Color an Indicator of Acid Sensitivity?

机译：在Athabasca油砂区域的湖泊中溶解有机碳：是酸敏感性的指示剂？

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摘要

TheAthabasca oil sands region (AOSR) in north-easternAlberta, Canada, contains the world's third largest known bitumen deposit. Oil sands (OS) operations produce emissions known to contribute to acidic and alkaline deposition, which can alter the chemistry of the receiving surface waters, including dissolved organic carbon (DOC). Little is known regarding the natural variability of aquatic DOC among lakes within the AOSR. Surface-water data from 50 lakes were analyzed; variables known to be associated with the light-absorptive properties of DOC (true color [TC]) were evaluated to investigate the potential variability of chromophoric DOC (CDOC). Comparison of TC and DOC revealed two distinct "high" (H) and "low" (L) lake subpopulations, the former being characterized by high relative TC and low DOC, and the latter by the inverse. The H lakes were defined by variables known to be associated with CDOC, while L lakes appeared well-buffered potentially owing to groundwater inputs. The divergent optical properties between subpopulations appeared partially attributable to pH-limited Fe complexation. Trajectory analysis indicated that H lakes most likely to receive atmospheric deposition from OS sources experienced significantly lower pH. These results are contrary to previous studies that found OS emissions to have minimal acidifying effect over lakes throughout the AOSR.
机译：Theathabasca Intr Sands地区（AOSR）在加拿大North-Easternalberta，包含世界第三大已知的沥青矿床。油砂（OS）操作会产生已知有助于酸性和碱性沉积的排放，这可以改变接收表面水的化学物质，包括溶解的有机碳（DOC）。对于AOSR内湖泊中的水生博士的自然变异很少。分析了50个湖泊的表面水数据;已知与DOC的光吸收特性相关联的变量（真彩[TC]）以研究发色机DOC（CDOC）的潜在变异性。 TC和DOC的比较揭示了两个不同的“高”（H）和“低”（L）湖泊群，前者以高相对TC和低DOC为特征，以及后者通过逆。 H湖泊由已知与CDOC相关联的变量定义，而L湖泊由于地下水输入可能出现良好缓冲。亚步骤之间的发散光学性质出现为pH限制Fe络合的部分归因于pH限制。轨迹分析表明，最有可能从OS源接受大气沉积的H湖泊显着降低了pH值。这些结果与先前的研究相反，发现OS排放在整个AOSR中对湖泊的酸化效果最小。

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