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首页> 外文期刊>Journal of soil & sediments >Historical sediment mercury deposition for select South Dakota, USA, lakes: implications for watershed transport and flooding
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Historical sediment mercury deposition for select South Dakota, USA, lakes: implications for watershed transport and flooding

机译：美国南达科他州部分湖泊的历史沉积物汞沉积：对分水岭运输和洪水的影响

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PurposeSelect South Dakota, USA water bodies, including both natural lakes and man-made impoundments, were sampled and analyzed to assess mercury (Hg) dynamics and historical patterns of total Hg deposition.Materials and methodsSediment cores were collected from seven South Dakota lakes. Mercury concentrations and flux profiles were determined using lead (Pb-210) dating and sedimentation rates.Results and discussionMost upper lake sediments contained variable heavy metal concentrations, but became more consistent with depth and age. Five of the seven lakes exhibited Hg accumulation fluxes that peaked between 1920 and 1960, while the remaining two lakes exhibited recent (1995-2009) Hg flux spikes. Historical sediment accumulation rates and Hg flux profiles demonstrate similar peak and stabilized values. Mercury in the sampled South Dakota lakes appears to emanate from watershed transport due to erosion from agricultural land use common to the Northern Great Plains.ConclusionsFor sampled South Dakota lakes, watershed inputs are more significant sources of Hg than atmospheric deposition.
机译：目的对美国南达科他州选定的水体（包括天然湖泊和人工蓄水池）进行采样和分析，以评估汞动力学和总汞沉积的历史规律。材料和方法收集了七个南达科他州湖泊的沉积物核心。使用铅（Pb-210）测年和沉积速率测定了汞的浓度和通量分布。结果与讨论大多数上层湖泊沉积物中的重金属浓度各不相同，但与深度和年龄更加一致。七个湖泊中有五个湖泊的汞累积通量峰值在1920年至1960年之间达到峰值，而其余两个湖泊的汞通量峰值最近（1995-2009年）。历史沉积物积累速率和汞通量曲线显示出相似的峰值和稳定值。由于北大平原常见的农业用地侵蚀，南达科他州采样湖中的汞似乎是从流域运输中散发出来的。结论对于南达科他州采样湖，与大气沉积相比，流域输入物是汞的重要来源。

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