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首页> 外文期刊>Canadian Water Resources Journal >Cumulative effects of the transport of asbestos-rich serpentine sediments in the trans-boundary Sumas Watershed in Washington State and British Columbia
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Cumulative effects of the transport of asbestos-rich serpentine sediments in the trans-boundary Sumas Watershed in Washington State and British Columbia

机译：华盛顿州和不列颠哥伦比亚省跨境苏马斯流域中富含石棉的蛇纹石沉积物运输的累积影响

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摘要

Serpentinitic sediments rich in chrysotile asbestos, from a natural landslide in the Sumas River Watershed in Washington State, are deposited on agricultural land during flooding events, creating a health concern for the rural population. The sediments have a chemical composition of high magnesium (Mg), nickel (Ni) and chromium (Cr) and high pH values compared with non-serpentinitic sediments that originate from the agricultural lowland. As the sediments are transported from the headwater to the mouth, the effects of mixing with non-serpentinitic water from agricultural drainage decrease the pH, increase the contents of organic matter, nitrate and zinc (Zn), and impact the sediments that originated from the landslide. A comparison of bed and suspended sediment showed that there is a clear seasonal effect with lower Mg and Ni values during low flow for both types of sediments. Bed sediments were consistently higher than suspended sediment in Mg and Ni. Sediments emerging from the landslide have positive zeta potentials but disperse very rapidly and become negatively charged. Once the sediment interacts with agricultural sources downstream the zeta potential becomes more negative, causing the sediment to stay suspended. It is postulated that at high pH, Mg is leached from the brucite layer of chrysotile and precipitates as Mg carbonate, which enriches the bed sediments in Mg and associated trace metal concentration.
机译：来自华盛顿州苏马斯河流域自然滑坡的富含温石棉石棉的蛇纹岩沉积物在洪水事件期间沉积在农田上，引起了农村居民的健康担忧。与源自农业低地的非蛇形沉积物相比，这些沉积物的化学成分为高镁（Mg），镍（Ni）和铬（Cr）和高pH值。随着沉积物从源头水运到河口，与农业排水中的非蛇纹石水混合的结果降低了pH值，增加了有机质，硝酸盐和锌（Zn）的含量，并影响了源自河床的沉积物。滑坡。床和悬浮沉积物的比较表明，两种类型的沉积物在低流量时都有明显的季节效应，其中Mg和Ni值较低。床底沉积物始终高于镁和镍的悬浮沉积物。从滑坡中浮出的沉积物具有正的ζ电势，但扩散非常迅速并带负电。一旦沉积物与下游的农业资源发生相互作用，zeta电位就会变得更负，导致沉积物保持悬浮状态。据推测，在高pH下，镁从温石棉的水镁石层中浸出，并以碳酸镁的形式沉淀，从而丰富了镁的床沉积物和相关的痕量金属浓度。

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  • 来源
    《Canadian Water Resources Journal》 |2015年第3期|262-271|共10页
  • 作者

    Schreier Hans; Lavkulich Les;

  • 作者单位

    Univ British Columbia, Fac Land & Food Syst, Vancouver, BC V5Z 1M9, Canada.;

    Univ British Columbia, Fac Land & Food Syst, Dept Soil Sci, Vancouver, BC V5Z 1M9, Canada.;

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