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Heavy metals in sediments of the Yarlung Tsangbo and its connection with the arsenic problem in the Ganges-Brahmaputra Basin

机译:雅鲁藏布江沉积物中的重金属及其与恒河-布拉马普特拉盆地中砷问题的关系

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摘要

The Yarlung Tsangbo (YT) is a large river running across southern Tibet and has significant effects on its lower reaches, the Ganges-Brahmaputra Basin. In order to investigate the geochemical features of the YT, 18 surface sediment samples were collected; ten trace element concentrations were measured for bulk sediments and two fine grain size fractions. Meanwhile, basic physicochemical parameters and element concentrations of river water were also analyzed. Results indicated that the river water was alkaline (pH 8.42) and that dissolved oxygen was mainly controlled by river water temperature. Some elements (e.g., Zn and Ni) showed close negative relationship to mean grain size of the sediments. Concentrations of most heavy metals, except As of the YT bulk sediments, were similar to those of Upper Crustal Concentration and its lower reaches, indicating almost no anthropogenic impact. Arsenic of the YT sediments was derived fundamentally from the parent rocks of the YT B asin and was far higher than that of its lower reaches. This indicates that relatively small amounts of As from the study area were transported down to the Brahmaputra River under present, relatively dry climatic conditions. However, more YT sediments might have been transported to its low reaches during the Holocene due to the wet climate, giving high As concentration in Holocene sediments of the Ganges-Brahmaputra Basin. Thus, As transported by the YT may produce important influence on the Ganges-Brahmaputra Basin and contribute to its high As concentration in groundwater.
机译:雅鲁藏布河(YTung Tsangbo,YT)是一条横跨西藏南部的大型河流,对其下游恒河-布拉马普特拉盆地具有重大影响。为了调查YT的地球化学特征,收集了18个地表沉积物样品。测量了十个痕量元素浓度的大块沉积物和两个细粒度部分。同时,还分析了河水的基本理化参数和元素浓度。结果表明,河水呈碱性(pH为8.42),溶解氧主要受河水温度控制。某些元素(例如Zn和Ni)与沉积物的平均粒径呈负相关。除YT大块沉积物外,大多数重金属的浓度与上地壳及其下游的浓度相似,表明几乎没有人为影响。 YT沉积物中的砷基本上来自YT B asin的母岩,并且远高于其下游。这表明在目前相对干燥的气候条件下,来自研究区的相对少量的砷被向下运输至雅鲁藏布江。但是,由于气候潮湿,可能在全新世期间将更多的YT沉积物运到其下游,使得恒河-布拉马普特拉盆地全新世沉积物中的砷含量较高。因此,YT运移的砷可能对恒河-布拉马普特拉盆地产生重要影响,并有助于其在地下水中的高砷浓度。

著录项

  • 来源
    《Environmental Geochemistry and Health》 |2011年第1期|p.23-32|共10页
  • 作者单位

    Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, CAS, 100085 Beijing, China;

    State Key Laboratory of Cryospheric Sciences, CAS, 730000 Lanzhou, China;

    Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, CAS, 100085 Beijing, China;

    Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, CAS, 100085 Beijing, China;

    Aquatic Ecology Centre, Kathmandu University, P.O. Box 6250, Dhulikhel, Kathmandu, Nepal;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    yarlung tsangbo; arsenic; metals; baseline concentration; river sediments;

    机译:雅鲁藏布;砷;金属;基线浓度;河流沉积物;
  • 入库时间 2022-08-17 13:28:18

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