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Erosion of the Alberta badlands produces highly variable and elevated heavy metal concentrations in the Red Deer River, Alberta

机译:艾伯塔省荒地的侵蚀在艾伯塔省的红鹿河中产生高度可变的重金属浓度

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Erosion is important in the transport of heavy metals from terrestrial to fluvial environments. In this study, we investigated riverine heavy metal (Cd, Cu, Hg and Pb) dynamics in the Red Deer River (RDR) watershed at sites upstream (n = 2) and downstream (n = 7) of the Alberta badlands, an area of naturally high erosion. At sites draining the badlands, total water column Cd, Cu, Hg and Pb concentrations frequently exceeded guidelines for the protection of freshwater biota. Furthermore, peak concentrations of total Cd(9.8μgL~(-1) ), Cu (212 μg L~(-1) ), Hg (649 ng L~(-1) ) and Pb (361 μg L~(-1)) were higher than, or comparable to, values reported for rivers and streams heavily impacted by anthropogenic activities. Total suspended solids (TSS) explained a large proportion (r2 = 0.34-0.83) of the variation in total metal concentrations in the RDR and tributaries and metal fluxes were dominated by the particulate fraction (60-98%). Suspended sediment concentrations (Csed) and metal to aluminum ratios were generally not indicative of substantial sediment enrichment Rather, the highly variable and elevated metal concentrations in the RDR watershed were a function of the high and variable suspended sediment fluxes which characterize the river system. While the impact of this on aquatic biota requires further investigation, we suggest erosion in the Alberta badlands may be contributing to Hg-based fish consumption advisories in the RDR. Importantly, this highlights a broader need for information on contaminant dynamics in watersheds subject to elevated rates of erosion.
机译:在将重金属从陆地环境转移到河流环境中,侵蚀非常重要。在这项研究中,我们调查了艾伯塔省荒地上游(n = 2)和下游(n = 7)地点红鹿河(RDR)分水岭中的河流重金属(Cd,Cu,Hg和Pb)动态自然高侵蚀。在流失荒地的地点,总水柱中Cd,Cu,Hg和Pb的浓度经常超过保护淡水生物区系的准则。此外,总Cd(9.8μgL〜(-1)),Cu(212μgL〜(-1)),Hg(649 ng L〜(-1))和Pb(361μgL〜(-1)的峰值浓度))高于或可比报告的受人为活动严重影响的河流和溪流的值。总悬浮固体(TSS)解释了RDR和支流中总金属浓度变化的很大一部分(r2 = 0.34-0.83),而金属通量主要由颗粒部分(60-98%)决定。悬浮泥沙浓度(Csed)和金属铝比通常不表示大量的泥沙富集。相反,RDR流域中高度变化和升高的金属浓度是河流系统高悬浮泥沙通量的函数。尽管这对水生生物群的影响尚需进一步调查,但我们建议艾伯塔省荒地的侵蚀可能是RDR中基于汞的鱼类消费咨询的原因。重要的是,这凸显了对侵蚀率升高的流域污染物动态信息的广泛需求。

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