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首页> 外文期刊>Environmental earth sciences >Findings on water quality in Upper Mustang (Nepal) from a preliminary geochemical and geological survey
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Findings on water quality in Upper Mustang (Nepal) from a preliminary geochemical and geological survey

机译：通过初步地球化学和地质调查发现上野马（尼泊尔）的水质

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摘要

The major ion and trace element chemistry of water samples, including springs, rivers and irrigation ditches, collected during a survey on August 2016 in the Upper Mustang region of the Mustang District of Dhawalagiri Zone (Nepal) has been investigated. The Upper Mustang region, a cold desert, represents a hot-spot for climate change: indeed, violent hailstorms and rainstorms have been recently observed, consequently exposing land to erosion. Results of this study indicate that waters in the region belong to the Ca-HCO3, Ca-Mg-Cl-SO4 and Na-K-Cl-types, reflecting different hydrochemical regimes. Uranium is widespread in waters, with concentrations up to 19 mu g/L recorded in a potable water supply. Locally, anoxic conditions affect uranium mobility due to the low solubility of U(IV) minerals. Highly toxic thallium was detected in a thermal spring at an elevated concentration (45 mu g/L Tl). The association of thallium with high concentrations of iron suggests that these elements are derived from pyrite oxidation. Detectable levels of thallium were also measured in the water of an irrigation ditch. Lithium concentrations ranged from 7 mu g/L to 12 mg/L in the thermal water and showed a strong association with chloride ions. Arsenic concentrations up to 4.7 mu g/L were measured in tributaries of the Kali Gandaki river. The data provide evidence that solutes in water have originated from an array of input sources, including carbonate dissolution, the dissolution of soluble salts, silicate weathering and localized sulfide oxidation. In particular, chemical weathering of granitic rocks is likely the primary source for metals and metalloids in waters. Since the erosion rate is a factor affecting lithological weathering, highintensity rainfalls due to climate change are expected to influence the release and fate of potentially harmful elements in the in the Upper Mustang Valley.
机译：2016年8月在达哈拉吉里地区（尼泊尔）野马区的上野马地区进行的一次调查中收集了水样的主要离子和微量元素化学成分，包括泉水，河流和灌溉沟渠。上野马地区，一片寒冷的沙漠，是气候变化的一个热点：的确，最近已观察到猛烈的冰雹和暴雨，因此使土地遭受侵蚀。这项研究的结果表明，该地区的水属于Ca-HCO3，Ca-Mg-Cl-SO4和Na-K-Cl型，反映了不同的水化学形态。铀广泛存在于水体中，饮用水中的铀浓度高达19微克/升。由于U（IV）矿物的溶解度低，缺氧条件会局部影响铀的迁移率。在温泉中以高浓度（45μg / L Tl）检测到剧毒的al。 with与高浓度铁的结合表明这些元素源自黄铁矿氧化。还测量了灌溉沟渠水中water的可检测水平。热水中锂的浓度范围为7μg/ L至12 mg / L，并显示出与氯离子的强相关性。在卡利甘达基河的支流中测得的砷浓度高达4.7微克/升。数据提供了证据，表明水中的溶质源自多种输入源，包括碳酸盐溶解，可溶性盐溶解，硅酸盐风化和局部硫化物氧化。特别是，花岗岩的化学风化可能是水中金属和准金属的主要来源。由于侵蚀速率是影响岩性风化的一个因素，气候变化导致的高强度降雨预计会影响上野马谷中潜在有害元素的释放和命运。

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  • 来源
    《Environmental earth sciences》 |2017年第19期|651.1-651.13|共13页
  • 作者

    Ghezzi L.; Petrini R.; Montomoli C.; Carosi R.; Paudyal K.; Cidu R.;

  • 作者单位

    Univ Pisa, Dipartimento Sci Terra, Via S Maria 53, I-56126 Pisa, Italy;

    Univ Pisa, Dipartimento Sci Terra, Via S Maria 53, I-56126 Pisa, Italy;

    Univ Pisa, Dipartimento Sci Terra, Via S Maria 53, I-56126 Pisa, Italy;

    Univ Turin, Dipartimento Sci Terra, Via Valperga Caluso 35, I-10125 Turin, Italy;

    Tribhuvan Univ, Cent Dept Geol, Kirtipur Kathmandu, Nepal;

    Univ Cagliari, Dipartimento Sci Chim & Geol, I-09042 Monserrato, CA, Italy;

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  • 正文语种 eng
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  • 关键词

    Upper Mustang (Nepal); Himalaya; Water geochemistry; Silicate weathering;

    机译：上野马（尼泊尔）;喜马拉雅山;水地球化学;硅酸盐风化;

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